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Course:CONS200/2026WT2/Orcas (Orcinus orca) and climate change in the Arctic: Status and impact

2026-04-13T06:14:19Z

AveryFishman:

[[File:Killerwhales jumping.jpg|alt=Killer Whales jumping out of the water|thumb|Killer Whales Jumping]]
Orcas (''Orcinus orca''), or killer whales, are apex marine predators found in oceans worldwide, including seasonally in Arctic waters. Historically, extensive sea ice acted as a physical barrier that limited the movement of orcas into much of the Arctic, restricting their access to prey species that inhabit environments covered with ice. However, climate change caused rising Arctic temperatures and significant declines in sea ice, which decreased by approximately 12.2% per decade since 1979<ref>{{Cite journal|last=Filatova|first=Olga A.|last2=Shpak|first2=Olga V.|last3=Ivkovich|first3=Tatiana V.|last4=Volkova|first4=Evgeniia V.|last5=Fedutin|first5=Ivan D.|last6=Ovsyanikova|first6=Ekaterina N.|last7=Burdin|first7=Alexander M.|last8=Hoyt|first8=Erich|date=March 23rd 2019|title=Large-scale habitat segregation of fish-eating and mammal-eating killer whales (Orcinus orca) in the western North Pacific|journal=Polar Biology|volume=42|doi=10.1007/s00300-019-02484-6}}</ref><ref name=":10" />. As this decline rate shows, orcas have increasingly been observed moving further into Arctic regions that were previously difficult to access<ref name=":11">{{Cite journal|last=Kimber|first=Brynn M.|last2=Braen|first2=Eric K.|last3=Wright|first3=Dana L.|last4=Harlacher|first4=Jenna M.|last5=Crance|first5=Jessica L.|last6=Berchok|first6=Catherine L.|date=January 6th, 2025|title=Less ice, more predators: passive acoustic monitoring shows variation in killer whale (Orcinus orca) presence in the U.S. Arctic with declining sea ice|journal=Polar Biology|volume=41|issue=21|pages=2|doi=10.1007/s00300-024-03332-y}}</ref>. This range expansion has raised ecological concerns because many Arctic marine mammals, such as bowhead whales and other species, used to rely on sea ice for protection against their predators<ref name=":12">{{Cite journal|last=Higdon|first=Jeff W|last2=Ferguson|first2=Steven H|date=July 19th, 2009|title=Loss of Arctic sea ice causing punctuated change in sightings of killer whales (Orcinus orca) over the past century|journal=National Library of Medicine|doi=10.1890/07-1941.1}}</ref>. In addition, these changes in ocean temperature and sea ice conditions are influencing the distribution of marine species, which may shift the predator-prey dynamics and the structure of Arctic marine food webs<ref>{{Cite journal|last=Laidre|first=Kristin L.|last2=Stern|first2=Harry|last3=Kovacs|first3=Kit M.|last4=Lowry|first4=Lloyd|last5=Moore|first5=Sue E.|last6=Regehr|first6=Eric V.|last7=Ferguson|first7=Steven H.|last8=Wiig|first8=Øystein|title=Arctic marine mammal population status, sea ice habitat loss, and conservation recommendations for the 21st century|journal=Conservation Biology|volume=29|issue=3|doi=10.1111/cobi.12474}}</ref>. Understanding how climate change affects orca distribution and their interactions with other Arctic marine mammals is essential for assessing the broader ecological changes occurring in the ecosystem. The following sections examine the background and ecological impacts of expanding orca presence in the Arctic, review current conservation policies like the Central Arctic Ocean Fisheries Agreement (CAOFA) along with its management efforts, and discuss potential strategies for addressing these emerging ecological challenges.

== Background on Orcas & The Arctic ==
=== Arctic Sea Ice Loss ===
Arctic sea ice has declined by ~12.2% per decade since 1979, as a result of the ocean warming caused by climate change<ref>{{Cite web|last=NASA|date=January 15, 2026|title=Arctic Sea Ice Minimum Extent - Earth Indicator|url=https://science.nasa.gov/earth/explore/earth-indicators/arctic-sea-ice-minimum-extent/|url-status=live}}</ref>. Though sea ice losses have remained relatively minimal in the past 20 years, estimates suggest that this slowed loss is only a temporary effect of a natural fluctuation in climate, and that sea ice will eventually resume<ref>{{Cite web|last=Carrington|first=Damian|date=August 20th, 2025|title=Dramatic slowdown in melting of Arctic sea ice surprises scientists|url=https://www.theguardian.com/environment/2025/aug/20/slowdown-in-melting-of-arctic-sea-ice-surprises-scientists|url-status=live|website=The Guardian}}</ref>. Further, once this temporary ice loss ends, expected by 2035 at the latest, there are heightened chances of an accelerated loss of Arctic sea ice<ref name=":10">{{Cite journal|last=England|first=M. R.|last2=Polvani|first2=L. M.|last3=Screen|first3=J.|last4=Chan|first4=A. C.|date=August 5th, 2025|title=Minimal Arctic Sea Ice Loss in the Last 20 Years, Consistent With Internal Climate Variability|journal=Geophysical Research Letters|volume=52|doi=10.1029/2025GL116175}}</ref>. This data suggests that the effects of sea ice losses in the Arctic have the potential to significantly worsen, which poses a significant risk to an Arctic that has already experienced significant losses in sea ice over the past 50 years, of over 10,000 km3<ref>{{Cite journal|last=Kwok|first=R.|date=October 12th, 2018|title=Arctic sea ice thickness, volume, and multiyear ice coverage: losses and coupled variability (1958–2018)|journal=Environmental Research Letters|volume=13|pages=105005|doi=10.1088/1748-9326/aae3ec}}</ref>. This decline in ice naturally results in a more open sea, which creates an extended range for orca populations<ref>{{Cite journal|last=Kimber|first=Brynn|last2=Harlacher|first2=Jenna|last3=Braen|first3=Eric|last4=Berchok|first4=Catherine|date=October 1st, 2021|title=Tracking killer whale movements in the Alaskan Arctic relative to a loss of sea ice|journal=The Journal of the Acoustial Society of America|volume=150|issue=4|doi=doi.org/10.1121/10.0008306}}</ref>.

=== History and Status of Orcas ===
[[File:Dorsal fin of a killer whale 03.jpg|alt=Dorsal Fin of a Killer Whale|thumb|Dorsal fin of a Killer Whale found close to the coast.]]The status of orca populations is difficult to quantify, largely because there remains an ongoing debate as to whether transient orcas (often called Brigg’s Killer Whales) and Southern Resident orcas, currently both considered subspecies of orca, should be classified as separate species<ref>{{Cite journal|last=Morin|first=Phillip A.|last2=McCarthy|first2=Morgan L.|last3=Fung|first3=Charissa W.|last4=Durban|first4=John W.|last5=Parsons|first5=Kim M.|last6=Perrin|first6=William F.|last7=Taylor|first7=Barbara L.|last8=Jefferson|first8=Thomas A.|last9=Archer|first9=Freckdrick I.|date=27 March 2024|title=Revised taxonomy of eastern North Pacific killer whales (Orcinus orca): Bigg’s and resident ecotypes deserve species status|journal=Royal Scoiety Open Science|volume=11|issue=3|doi=10.1098/rsos.231368}}</ref>. Transient orcas are currently considered to be thriving, while Southern Resident orcas, in particular, face the largest risks of extinction, primarily due to pollutants accumulated from the fish eaten by residents, disturbance from marine vessels, and the availability of salmon as a food source<ref>{{Cite web|last=NOAA Fisheries|date=September 2nd, 2025|title=Saving the Southern Resident Killer Whales|url=https://www.fisheries.noaa.gov/west-coast/endangered-species-conservation/saving-southern-resident-killer-whales|url-status=live}}</ref>. Mammal-eating Brigg’s Killer Whale populations, meanwhile, have consistently grown for decades, with the population off the coast of British Columbia having more than doubled in size to over 500 individuals since 1990<ref>{{Cite journal|last=Fisheries and Oceans Canada|date=July 2013|title=Information In Support of the Identification of Critical Habitatat for Transient Killer Whales (Orcinus Orca) Off the West Coast of Canada|url=https://waves-vagues.dfo-mpo.gc.ca/Library/349619.pdf|journal=Science Advisory Report}}</ref>. However, Brigg’s Killer Whales still face threats from pollutants and vessel activity, as do residents, with vessel activity potentially impacting Brigg’s ability to hunt<ref>{{Cite journal|last=Jourdain|first=Eve|last2=Goh|first2=Tiffany|last3=Kuningas|first3=Sanna|last4=Simila|first4=Tiu|last5=Vongraven|first5=Dag|last6=Karoliussen|first6=Richard|last7=Bisther|first7=Anna|last8=Hammond|first8=Phillip J|date=November 18th 2021|title=Killer whale (Orcinus orca) population dynamics in response to a period of rapid ecosystem change in the eastern North Atlantic|journal=Ecology and Evolution|volume=11|issue=23|doi=10.1002/ece3.8364Digital Object Identifier (DOI)}}</ref>. Given the relatively reliable growth of Brigg’s transient Killer Whales however, in addition to the extension of the orca’s typical range, there are important implications for other mammal species in the Arctic.
[[File:Bowhead Whale NOAA.jpg|alt=Lone Bowhead Whale in Arctic|left|thumb|Bowhead Whale in the Arctic. Bowhead Whales escape predation by punching holes under Arctic sea ice<ref name=":0">{{Cite journal|last=Huntington|first=Henry P.|date=21 March 2008|title=A preliminary assessment of threats to arctic marine mammals and their conservation in the coming decades|journal=Marine Policy|volume=33|issue=1|doi=10.1016/j.marpol.2008.04.003}}</ref>.]]

=== History and Status of Key Arctic Marine Mammals ===

==== Bowhead Whales ====
One of the few endemic whale species in the Arctic includes the Bowhead Whale, a population which experienced severe declines as a direct result of whaling, from an estimated peak of 50,000 to less than 3,000 by 1921<ref name=":1">{{Cite web|last=NOAA Fisheries|date=Accessed Fedbuary 15th, 2026|title=Bowhead Whale|url=https://www.fisheries.noaa.gov/species/bowhead-whale|url-status=live}}</ref>. After the end of commercial whaling, and the implementation of protections in the 1970s, many populations have since rebounded rapidly, with one subpopulation, the Bering-Chukchi-Beaufort, having rebounded to over 14,000 individuals<ref>{{Cite journal|last=Givens|first=Geof|last2=George|first2=J. Craig|last3=Suydam|first3=Robert|last4=Tudor|first4=Barbara|last5=Von Duyke|first5=Andrew|last6=Person|first6=Brian|date=April 11, 2023|title=Correcting the 2019 survey abundance of Bering-Chukchi-Beaufort Seas bowhead whales for disturbance from powered skiffs|journal=Journal of Cetacean Research and Management|volume=24|doi=10.47536/jcrm.v22i1.362}}</ref>. However, this rebound hasn’t been felt equally by all Bowhead Whale populations. The Okhotsk Sea population, for example, has only a few hundred individuals remaining, and is at heightened risk<ref name=":1" />. A key risk factor for Bowhead Whales is the rising of sea temperatures, and the loss of sea ice, which Bowhead Whales depend on for foraging and protection from predators<ref>{{Cite journal|last=de Greef|first=Evelien|last2=Müller|first2=Claudio|last3=Snead|first3=Anthony A.|last4=Rivkin|first4=Ruth L.|last5=Ferguson|first5=Steven H.|last6=Watt|first6=Cortney A.|last7=Marcoux|first7=Marianne|last8=Petersen|first8=Stephen D.|last9=Garroway|first9=Colin J.|date=March 2026|title=Identifying Areas of Potential Risk Based on Future Genetic Adaptability in Three Arctic Whale Species|journal=The American Naturalist|volume=207|issue=3|doi=10.1086/738889}}</ref>.

==== Narwhals & Beluga Whales ====
Additional notable Arctic marine mammals include Narwhals and Beluga Whales. In the Arctic Ocean, both of these animals rely heavily on the availibility of Arctic sea ice for many facets of their survival, including for foraging and protection from predation<ref name=":2">{{Cite journal|last=Williams|first=Terri M.|last2=Noren|first2=Shawn R.|last3=Glenn|first3=Mike|date=August 26th, 2010|title=Extreme physiological adaptations as predictors of climate-change sensitivity in the narwhal, Monodon monoceros|journal=Marine Mammal Science|volume=27|pages=2|doi=10.1111/j.1748-7692.2010.00408.xDigital Object Identifier (DOI)}}</ref>. Both marine mammals have been documented to use their ability to create or reach air pockets in thick ice to escape Killer Whales<ref name=":2" /><ref name=":4">{{Cite book|title=The World of the Arctic Whales: Belugas, Bowheads, and Narwhals|last=Paine|first=Stefani|publisher=Sierra Club Books|year=1997|isbn=0871569574, 9780871569578}}</ref>. The conservation status of both is similar, with both being considered of least concern on the IUCN Red list<ref>{{Cite web|last=Lowry|first=L.|last2=Reeves|first2=R.|last3=Laidre|first3=K.|date=June 22nd, 2017|title=Delphinapterus leucas. The IUCN Red List of Threatened Species|url=https://www.iucnredlist.org/species/6335/50352346|url-status=live|website=IUCN Red List|doi=10.2305/IUCN.UK.2017-3.RLTS.T6335A50352346.en}}</ref><ref>{{Cite web|last=Lowry|first=L.|last2=Laidre|first2=K.|last3=Reeves|first3=R.|date=July 3rd, 2017|title=Monodon monoceros. The IUCN Red List of Threatened Species|url=https://www.iucnredlist.org/species/13704/50367651|url-status=live|website=IUCN Red List|doi=10.2305/IUCN.UK.2017-3.RLTS.T13704A50367651.en}}</ref>. However, the status of these species varies significantly by population. One particularly threatened sub population in the Cook Inlet of Alaska, for example, has been in decline since the 1990s, having been historically descimated by whaling<ref name=":5">{{Cite journal|last=Shelden|first=Kim E. W.|last2=Rugh|first2=David J.|last3=Mahoney|first3=Barbara A.|last4=Dahlheim|first4=Amarilyn E.|title=Killer Whale Predation On Belugas in Cook Inlet, Alaska: Implications for a Depleted Population|url=https://web.archive.org/web/20121224211121/http://www.fakr.noaa.gov/protectedresources/whales/beluga/MMSKillerwhaleBeluga.pdf|dead-url=http://www.fakr.noaa.gov/protectedresources/whales/beluga/MMSKillerwhaleBeluga.pdf|journal=Marine Mammal Science|volume=19|issue=3}}</ref>.

== Threats to Marine Mammals in the Arctic Today ==

=== Current Threats ===
[[File:Shell Oil's Polar Pioneer Arctic Drilling Rig - West Seattle, Seattle, Washington.jpg|alt=Oil Drilling Rig in a Port|thumb|Polar Pioneer Arctic Drilling Rig, owned by Shell Oil. ]]
Presently, most marine Arctic mammal species are doing reasonably well, with most able to sustain small amounts of sport and subsistence hunting. However, several factors, namely disease, disruption from vessels, offshore oil extraction, direct and indirect fishery impacts, habitat and environmental changes, and algae blooms, threaten the stability of many Arctic species<ref name=":0" />. Nearly all of these factors are caused or exacerbated severely by human activity. One of the most extensive human effects in particular is climate change, which is currently affecting all parts of the Arctic and will continue to, especially through increasingly open water due to ice melting, as well as warmer water<ref>{{Cite news|url=https://www.amap.no/documents/doc/amap-assessment-report-arctic-pollution-issues/68|title=AMAP Assessment Report: Arctic Pollution Issues|last=AMAP|date=1998|isbn=82-7655-061-4}}</ref>. For many Arctic marine mammals, including narwhal, Beluga & Bowhead Whales, and seals, that rely on sea ice, the loss of Arctic sea ice poses a dire threat to their well-being<ref name=":0" />. The risks are heightened by the limited ability of specialized Arctic marine mammals to respond quickly to rapid environmental fluctuations, due to their long lifespans<ref name=":3" />. Further, the loss of sea ice presents an opportunity for outcrowding from marine mammals that typically live in the Arctic seasonally, including Orca and several whale species such as Fin and Humpback<ref name=":3">{{Cite journal|last=Moore|first=Sue P.|last2=Huntington|first2=Henry P.|date=March 1st, 2008|title=Arctic Marine Mammals and Climate Change: Impacts and Resilience|journal=Ecological Applications|volume=18|issue=sp2|doi=10.1890/06-0571.1}}</ref>.

== Impacts of Orca Hunting on Arctic Marine Mammals ==

=== '''Sea Ice in the Context of Killer Whale Hunting''' ===
For many permanent residents of the Arctic, including Bowhead Whales, Narwhals, and Beluga Whales<ref name=":0" /><ref name=":2" /><ref name=":4" /> , sea ice is crucial for evading predators that cannot spend prolonged periods of time underneath the ice. For example, Bowhead Whales are able to make air pockets underneath Arctic ice, which allows them to stay underneath the ice for prolonged periods, whereas Orcas are unable to do the same and would be unable to successfully hunt the Bowhead Whale<ref name=":0" />.

=== '''Increased Hunting Opportunities from Sea Ice Loss''' ===
[[File:Killer Whales Hunting a Seal.jpg|alt=Killer Whales hunting a seal, stranded on a small piece of ice|thumb|Killer Whales hunting a seal. Sea ice provides Arctic marine mammals with escape opportunities from Killer Whales, which are lost as Arctic sea ice melts. ]]Given the protections provided by sea ice, the loss of sea ice in the Arctic in notable in the changes this loss causes, in terms of Orca hunting opportunities. The melting of sea ice has increased the hunting opportunities for mammal-eating Brigg’s Killer Whales, so much so that predation from Killer Whales has become the biggest source of documented Bowhead Whale carcasses<ref name=":13">{{Cite journal|last=Willoughby|first=Amy L.|last2=Ferguson|first2=Megan C.|last3=Stimmelmayr|first3=Raphaela|last4=Clarke|first4=Janet T.|last5=Brower|first5=Amelia A.|date=September 10th, 2017|title=Bowhead whale (Balaena mysticetus) and killer whale (Orcinus orca) co-occurrence in the U.S. Pacific Arctic, 2009–2018: evidence from bowhead whale carcasses|journal=Polar Biology|volume=43|doi=10.1007/s00300-020-02734-y.}}</ref>. For Beluga Whales, predation by Killer Whales has become significant as well, with one population in Cook Inlet, Alaska, experiencing increased pressure from Killer Whale predation, despite their presence in the region historically being small<ref name=":5" />. It is for this reason that loss of sea ice is likely to prove beneficial largely for non-resident marine life, particularly orcas, in the Arctic, while permanent resident marine life is facing severe risk<ref name=":3" />. Addressing this issue ultimately requires a massive global-wide effort to curb climate change, as soon as possible. In the interim, to help support threatened marine life, more local effects should be pursued, such as reducing noise disruptions from vessels and curtailing offshore oil and gas drilling. These small-scale solutions can delay the worst effects for local Arctic residents, including endangered populations of Bowhead Whales<ref name=":0" />.
== Current Action ==
=== Protection Status ===
In 2008, the Killer whale population in the Eastern Arctic region was listed as a special concern under the Committee on the status of Endangered Wildlife in Canada (COSEWIC)<ref name=":8">{{Cite web|date=October 21st, 2024|title=Killer Whale (Orcinus orca): COSEWIC assessment and status report 2023|url=https://www.canada.ca/en/environment-climate-change/services/species-risk-public-registry/cosewic-assessments-status-reports/killer-whale-2023.html#toc6|url-status=live|website=Government of Canada}}</ref>. Later in 2023, they were reassessed and found to maintain the special concern status<ref name=":8" />. The special concern status describes populations that are at risk of becoming endangered or threatened, although not in imminent risk of extirpation<ref>{{Cite web|date=Accessed March 15th, 2026|title=Table 5. COSEWIC status categories|url=https://cosewic.ca/index.php/en/assessment-process/cosewic-assessment-process-categories-and-guidelines/status-categories.html|url-status=live}}</ref>. However, other populations, including the Southern resident orcas located off the Pacific west coast are considered endangered by COSEWIC<ref name=":8" />.
[[File:Arctic (orthographic projection).svg|thumb|235x235px|Map of the Arctic Ocean ]]

=== Conservation Strategies ===
Reproduction for orcas is relatively slow, with generation time being around 29 years for populations in the Arctic<ref name=":8" />. Thus, recovery from low population rates is expected to take time, even with protection measures in place. Many conservation projects and policies are being put into place in the Arctic to help ecosystems withstand the impacts of climate change and industrial activity, although their effectiveness has not yet been assessed. Due to their non critically endangered status, little protection specific to orcas have been put in place in the Arctic, but rather broad actions to preserve the entire ecosystem.

With the Arctic ecosystem rapidly changing, strong concerns have emerged for long term food availability for all species, including Orcas<ref name=":9">{{Cite journal|last=Misund|first=Ole|last2=Hop|first2=Haakon|last3=Quillfeldt|first3=Cecile|date=October 1st, 2025|title=Area based management in polar oceans for biodiversity conservation and enhanced sustainability of fisheries.|url=https://doi.org/10.3389/focsu.2025.1634989|journal=Frontier in Ocean Sustainability|volume=Vol 615|pages=pp. 373}}</ref>. As ice melts, marine areas previously restricted become more accessible<ref name=":9" />. This is likely to cause more unregulated overfishing, putting even more pressure on an already vulnerable ecosystem<ref name=":9" />. The Central Arctic Ocean Fisheries Agreement was implemented in 2021 with the goal of minimizing damage to food chains in the Arctic<ref name=":9" />. The eight countries involved; Canada, the United States, Russia, Finland, Sweden, Denmark, Norway and Iceland, have agreed to ban commercial fishing from the designated Marine Protected area for at least 15 years until resource availability has been assessed and mapped<ref name=":9" />. Prohibiting fishing from designed areas leaves more fish resources for the several endangered species in the Arctic, including Bowhead whales and narwhals<ref name=":9" />. This protection measure does not however address the growing concern of food chain disimbalance caused by increased opportunities for orcas to hunt their prey as they migrate further into the Arctic.

Much of the world’s oceans are beyond National control<ref name=":7" />. Despite the CAOFA fishing ban, the Arctic remains vulnerable to other exploitative activities such as deep sea mining and shipping routes. In January 2026, the High Seas Treaty, an international agreement was put into force to safeguard oceans across the world from harmful commercial activities under the UN convention of the Law and the Seas <ref name=":6">{{Cite news|url=https://unu.edu/ehs/article/what-high-seas-treaty-and-why-it-important|title=What is the High Seas Treaty and Why is it Important?|date=January 16th, 2026|work=UNU EHS|access-date=Accessed April 11th, 2026}}</ref>. With this treaty in place, companies planning projects in the ocean will need to carry out environmental assessments prior to taking any action<ref name=":7" />. Furthermore, the treaty creates more opportunities to establish more marine protected areas<ref name=":7">{{Cite journal|date=March 16th, 2023|title=How science can fill the gaps of the high seas treaty|url=https://www.nature.com/articles/d41586-023-00757-z.pdf|journal=Nature|volume=Vol. 615|pages=373}}</ref>. Though in its early stages of progress, this is considered one of the most ambitious attempts at safeguarding oceans from habitat destruction and biodiversity loss. Governing, financing and monitoring mechanisms of the treaty are anticipated to be discussed in April of 2026<ref name=":6" />. Many non profit organizations and conservation groups are also taking part in the initiative. For instance, the WWF has developed ActNet, a framework of databases that has mapped out priority areas for conservation for once the treaty is put into action<ref>{{Cite web|date=March 13th, 2026|title=ActNet|url=https://www.arcticwwf.org/our-priorities/arcnet/|url-status=live|website=WWF Arctic}}</ref>. Although many recent advancement in Arctic conservation have been substantial, much more work is needed to ensure the protection of its biodiversity.

==Future Considerations ==
To mitigate the ecological impacts associated with the increasing presence of orcas in Arctic ecosystems, management approaches that incorporate technical, cultural, social, and political perspectives must be addressed.

=== '''Technical Solutions''' ===
Declining sea ice is enabling the increased presence of orcas—apex predators—in Arctic marine ecosystems, where their predation has the potential to significantly alter existing food-web dynamics. Monitoring technologies that track orca distribution, population and sea ice conditions can provide early warnings of ecosystem changes and inform conservation planning. In the Arctic, orcas are predators with "large and versatile ranges, giving them the potential to significantly impact populations and marine configurations"<ref name=":11" />. Orcas exhibit high levels of intelligence that allow them to capture prey efficiently, emphasizing the need for continued monitoring of their ecological interactions and environmental impacts<ref>''Orcas and dolphins seen hunting together for the first time''. UBC Science. (n.d.). <nowiki>https://science.ubc.ca/news/2025-12/orcas-and-dolphins-seen-hunting-together-first-time</nowiki> </ref>. A study published in ''Polar Biology'' analyzed acoustic recordings from eight Arctic monitoring sites between 2011 and 2019 and detected orca vocalizations across the region, identifying periods of time when they were present<ref name=":11" />. A similar study uses passive acoustic monitoring as an effective and non-invasive method to observe orca distribution and residency patterns, detecting seasonal patterns<ref>Myers, H. J., Olsen, D. W., Matkin, C. O., Horstmann, L. A., & Konar, B. (2021, October 13). ''Passive acoustic monitoring of Killer Whales (Orcinus orca) reveals year-round distribution and residency patterns in the Gulf of Alaska''. Nature News. <nowiki>https://www.nature.com/articles/s41598-021-99668-0</nowiki> </ref>. In addition to acoustic monitoring, satellite tagging further works to track movement in the Arctic. In the eastern Canadian Arctic, satellite telemetry reveals how orcas navigated long-distance travel, actively avoiding sea ice. These tracking methods extend research knowledge on migration routes and habitat use, providing long-term data on how these predators move into newly accessible Arctic waters as sea ice declines. In contrast to direct observation, combining historical sighting records and sea-ice data in Hudson Bay illustrates how environmental changes can be used to track orca presence and distribution. Sea ice previously acted as a “barrier”, limiting orca movement into Arctic waters; however, as ice declined, sightings increased exponentially<ref name=":12" />. Climate monitoring allows for predictions on where predator expansion may occur, and understanding ice dynamics helps forecast future ecosystem changes. Technical solutions help scientists better understand when and where orcas enter Arctic ecosystems, while also showing the ecological consequences of increased predation on Arctic marine mammals such as narwhal, beluga, and bowhead whales, which have historically relied on sea ice as a refuge from predators. Increasing awareness and conservation incentives surrounding these issues can help promote the long-term stability of Arctic marine ecosystems.

=== '''Cultural and Social Collaboration''' ===
While modern technological advances provide insight on how predator and prey relationships can be sustainably managed, these methods are relatively new and still developing. For long-term impact, conservation planning should involve collaboration with Indigenous communities in Arctic regions, recognizing their long-standing relationship with local ecosystems and their deep knowledge of sustainable marine stewardship. Integrating Indigenous knowledge systems alongside scientific research ensures effective and respectful approaches to marine conservation. By applying traditional ecological knowledge, Inuit hunters documented orca predation on multiple marine species—including beluga whales, narwhals, bowhead whales, seals, and walruses—offering behavioural observations that are otherwise difficult to obtain through scientific research alone<ref name=":1" />. Furthermore, beyond ecological impacts, orca predation is deeply interlinked with social and cultural implications. Given the cultural and economic importance of marine mammals for subsistence, Inuit hunters have raised concerns about potential declines in their populations<ref name=":1" />. These concerns stem from long-standing community dependence on environmental stability, through which Inuit hunters have developed extensive ecological knowledge and observations that serve as a reliable foundation for sustainable ecosystem management. Integrating traditional ecological knowledge with scientific research can improve environmental monitoring as community observations provide long-term ecological records that complement short-term scientific datasets<ref name=":14">Integrating traditional ecological knowledge with scientific research can improve environmental monitoring, as community observations provide long-term ecological records that complement short-term scientific datasets (Proulx et al., 2021).</ref>.

=== '''Policy and Management''' ===
Evidence of shifting orca distribution is measurable through visible scarring on prey species, such as bowhead whales, indicating significant predatory impacts<ref>Willoughby, A. L., Ferguson, M. C., Stimmelmayr, R., Clarke, J. T., & Brower, A. A. (2020). ''Bowhead whale (Balaena mysticetus) and killer whale (Orcinus orca) co-occurrence in the U.S. Pacific Arctic, 2009–2018: Evidence from bowhead whale carcasses''. Polar Biology, 43, 1669–1679.</ref>. The frequency of these occurrences suggests that greater protective measures are necessary to safeguard Arctic marine ecosystems, particularly through Arctic management and conservation policies. Protected areas and conservation policies enable governments to limit additional human pressures that may intensify instability in marine ecosystems and populations. Well-managed marine protected areas have been shown to support significantly higher biomass and species density compared to unprotected regions, demonstrating their role in enhancing ecosystem stability<ref>Edgar, G. J., Stuart-Smith, R. D., Willis, T. J., Kininmonth, S., Baker, S. C., Banks, S., Barrett, N. S., Becerro, M. A., Bernard, A. T. F., Berkhout, J., Buxton, C. D., Campbell, S. J., Cooper, A. T., Davey, M., Edgar, S. C., Försterra, G., Galván, D. E., Irigoyen, A. J., Kushner, D. J., … Thomson, R. J. (2014). Global conservation outcomes depend on marine protected areas with five key features. Nature, 506(7487), 216–220. <nowiki>https://doi.org/10.1038/nature13022</nowiki></ref>. In addition to strengthening ecosystem resilience, these protected areas improve ecological interactions within marine food webs while limiting human stressors such as fishing and habitat disturbance<ref>Halpern, B. S., Lester, S. E., McLeod, K. L., & Gaines, S. D. (2010). Placing marine protected areas onto the ecosystem-based management seascape. ''Proceedings of the National Academy of Sciences of the United States of America'', ''107''(43), 18312–18317. <nowiki>http://www.jstor.org/stable/25748486</nowiki></ref>. Although protected areas cannot directly prevent the climate-driven range expansion of orcas, they can help maintain stable prey populations by reducing additional human pressures, thereby enhancing the resilience of Arctic marine ecosystems facing increasing predation stress.

Addressing the ecological impacts of orca range expansion will require integrated management strategies that account for both environmental and human dimensions.

==Conclusion==
In conclusion, climate change is significantly reshaping Arctic marine ecosystems, particularly through the continued decline of sea ice. As more areas become accessible due to melting ice, orcas are expanding their range, which shifts the existing ecological balance of the region<ref name=":12" />. Many Arctic marine mammals that historically relied on sea ice for feeding and protection are now facing new predatory pressures<ref name=":13" />. Current conservation policies, such as the Central Arctic Ocean Fisheries Agreement (CAOFA) and various monitoring programs, aim to reduce additional stress on these ecosystems<ref name=":9" />. However, ongoing environmental change continues to create new challenges for Arctic biodiversity. Effectively managing these changes will require a combination of technical monitoring and collaboration with Indigenous communities to integrate traditional ecological knowledge<ref name=":14" />. Ultimately, ongoing research will be essential for understanding the long-term impacts of orca activity and ensuring stability of Arctic marine ecosystems in a warming world.

==References==
<references/>

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[[Category:Conservation]]

Course:CONS200/2026WT2/Orcas (Orcinus orca) and climate change in the Arctic: Status and impact

2026-04-13T05:49:45Z

AveryFishman:

[[File:Killerwhales jumping.jpg|alt=Killer Whales jumping out of the water|thumb|Killer Whales Jumping]]
Orcas (''Orcinus orca''), or killer whales, are apex marine predators found in oceans worldwide, including seasonally in Arctic waters. Historically, extensive sea ice acted as a physical barrier that limited the movement of orcas into much of the Arctic, restricting their access to prey species that inhabit environments covered with ice. However, climate change caused rising Arctic temperatures and significant declines in sea ice, which decreased by approximately 12.2% per decade since 1979<ref>{{Cite journal|last=Filatova|first=Olga A.|last2=Shpak|first2=Olga V.|last3=Ivkovich|first3=Tatiana V.|last4=Volkova|first4=Evgeniia V.|last5=Fedutin|first5=Ivan D.|last6=Ovsyanikova|first6=Ekaterina N.|last7=Burdin|first7=Alexander M.|last8=Hoyt|first8=Erich|date=March 23rd 2019|title=Large-scale habitat segregation of fish-eating and mammal-eating killer whales (Orcinus orca) in the western North Pacific|journal=Polar Biology|volume=42|doi=10.1007/s00300-019-02484-6}}</ref><ref name=":10" />. As this decline rate shows, orcas have increasingly been observed moving further into Arctic regions that were previously difficult to access<ref name=":11">{{Cite journal|last=Kimber|first=Brynn M.|last2=Braen|first2=Eric K.|last3=Wright|first3=Dana L.|last4=Harlacher|first4=Jenna M.|last5=Crance|first5=Jessica L.|last6=Berchok|first6=Catherine L.|date=January 6th, 2025|title=Less ice, more predators: passive acoustic monitoring shows variation in killer whale (Orcinus orca) presence in the U.S. Arctic with declining sea ice|journal=Polar Biology|volume=41|issue=21|pages=2|doi=10.1007/s00300-024-03332-y}}</ref>. This range expansion has raised ecological concerns because many Arctic marine mammals, such as bowhead whales and other species, used to rely on sea ice for protection against their predators<ref name=":12">{{Cite journal|last=Higdon|first=Jeff W|last2=Ferguson|first2=Steven H|date=July 19th, 2009|title=Loss of Arctic sea ice causing punctuated change in sightings of killer whales (Orcinus orca) over the past century|journal=National Library of Medicine|doi=10.1890/07-1941.1}}</ref>. In addition, these changes in ocean temperature and sea ice conditions are influencing the distribution of marine species, which may shift the predator-prey dynamics and the structure of Arctic marine food webs<ref>{{Cite journal|last=Laidre|first=Kristin L.|last2=Stern|first2=Harry|last3=Kovacs|first3=Kit M.|last4=Lowry|first4=Lloyd|last5=Moore|first5=Sue E.|last6=Regehr|first6=Eric V.|last7=Ferguson|first7=Steven H.|last8=Wiig|first8=Øystein|title=Arctic marine mammal population status, sea ice habitat loss, and conservation recommendations for the 21st century|journal=Conservation Biology|volume=29|issue=3|doi=10.1111/cobi.12474}}</ref>. Understanding how climate change affects orca distribution and their interactions with other Arctic marine mammals is essential for assessing the broader ecological changes occurring in the ecosystem. The following sections examine the background and ecological impacts of expanding orca presence in the Arctic, review current conservation policies like the Central Arctic Ocean Fisheries Agreement (CAOFA) along with its management efforts, and discuss potential strategies for addressing these emerging ecological challenges.

== Background on Orcas & The Arctic ==
=== Arctic Sea Ice Loss ===
Arctic sea ice has declined by ~12.2% per decade since 1979, as a result of the ocean warming caused by climate change<ref>{{Cite web|last=NASA|date=January 15, 2026|title=Arctic Sea Ice Minimum Extent - Earth Indicator|url=https://science.nasa.gov/earth/explore/earth-indicators/arctic-sea-ice-minimum-extent/|url-status=live}}</ref>. Though sea ice losses have remained relatively minimal in the past 20 years, estimates suggest that this slowed loss is only a temporary effect of a natural fluctuation in climate, and that sea ice will eventually resume<ref>{{Cite web|last=Carrington|first=Damian|date=August 20th, 2025|title=Dramatic slowdown in melting of Arctic sea ice surprises scientists|url=https://www.theguardian.com/environment/2025/aug/20/slowdown-in-melting-of-arctic-sea-ice-surprises-scientists|url-status=live|website=The Guardian}}</ref>. Further, once this temporary ice loss ends, expected by 2035 at the latest, there are heightened chances of an accelerated loss of Arctic sea ice<ref name=":10">{{Cite journal|last=England|first=M. R.|last2=Polvani|first2=L. M.|last3=Screen|first3=J.|last4=Chan|first4=A. C.|date=August 5th, 2025|title=Minimal Arctic Sea Ice Loss in the Last 20 Years, Consistent With Internal Climate Variability|journal=Geophysical Research Letters|volume=52|doi=10.1029/2025GL116175}}</ref>. This data suggests that the effects of sea ice losses in the Arctic have the potential to significantly worsen, which poses a significant risk to an Arctic that has already experienced significant losses in sea ice over the past 50 years, of over 10,000 km3<ref>{{Cite journal|last=Kwok|first=R.|date=October 12th, 2018|title=Arctic sea ice thickness, volume, and multiyear ice coverage: losses and coupled variability (1958–2018)|journal=Environmental Research Letters|volume=13|pages=105005|doi=10.1088/1748-9326/aae3ec}}</ref>. This decline in ice naturally results in a more open sea, which creates an extended range for orca populations<ref>{{Cite journal|last=Kimber|first=Brynn|last2=Harlacher|first2=Jenna|last3=Braen|first3=Eric|last4=Berchok|first4=Catherine|date=October 1st, 2021|title=Tracking killer whale movements in the Alaskan Arctic relative to a loss of sea ice|journal=The Journal of the Acoustial Society of America|volume=150|issue=4|doi=doi.org/10.1121/10.0008306}}</ref>.

=== History and Status of Orcas ===
[[File:Dorsal fin of a killer whale 03.jpg|alt=Dorsal Fin of a Killer Whale|thumb|Dorsal fin of a Killer Whale found close to the coast.]]The status of orca populations is difficult to quantify, largely because there remains an ongoing debate as to whether transient orcas (often called Brigg’s Killer Whales) and Southern Resident orcas, currently both considered subspecies of orca, should be classified as separate species<ref>{{Cite journal|last=Morin|first=Phillip A.|last2=McCarthy|first2=Morgan L.|last3=Fung|first3=Charissa W.|last4=Durban|first4=John W.|last5=Parsons|first5=Kim M.|last6=Perrin|first6=William F.|last7=Taylor|first7=Barbara L.|last8=Jefferson|first8=Thomas A.|last9=Archer|first9=Freckdrick I.|date=27 March 2024|title=Revised taxonomy of eastern North Pacific killer whales (Orcinus orca): Bigg’s and resident ecotypes deserve species status|journal=Royal Scoiety Open Science|volume=11|issue=3|doi=10.1098/rsos.231368}}</ref>. Transient orcas are currently considered to be thriving, while Southern Resident orcas, in particular, face the largest risks of extinction, primarily due to pollutants accumulated from the fish eaten by residents, disturbance from marine vessels, and the availability of salmon as a food source<ref>{{Cite web|last=NOAA Fisheries|date=September 2nd, 2025|title=Saving the Southern Resident Killer Whales|url=https://www.fisheries.noaa.gov/west-coast/endangered-species-conservation/saving-southern-resident-killer-whales|url-status=live}}</ref>. Mammal-eating Brigg’s Killer Whale populations, meanwhile, have consistently grown for decades, with the population off the coast of British Columbia having more than doubled in size to over 500 individuals since 1990<ref>{{Cite journal|last=Fisheries and Oceans Canada|date=July 2013|title=Information In Support of the Identification of Critical Habitatat for Transient Killer Whales (Orcinus Orca) Off the West Coast of Canada|url=https://waves-vagues.dfo-mpo.gc.ca/Library/349619.pdf|journal=Science Advisory Report}}</ref>. However, Brigg’s Killer Whales still face threats from pollutants and vessel activity, as do residents, with vessel activity potentially impacting Brigg’s ability to hunt<ref>{{Cite journal|last=Jourdain|first=Eve|last2=Goh|first2=Tiffany|last3=Kuningas|first3=Sanna|last4=Simila|first4=Tiu|last5=Vongraven|first5=Dag|last6=Karoliussen|first6=Richard|last7=Bisther|first7=Anna|last8=Hammond|first8=Phillip J|date=November 18th 2021|title=Killer whale (Orcinus orca) population dynamics in response to a period of rapid ecosystem change in the eastern North Atlantic|journal=Ecology and Evolution|volume=11|issue=23|doi=10.1002/ece3.8364Digital Object Identifier (DOI)}}</ref>. Given the relatively reliable growth of Brigg’s transient Killer Whales however, in addition to the extension of the orca’s typical range, there are important implications for other mammal species in the Arctic.
[[File:Bowhead Whale NOAA.jpg|alt=Lone Bowhead Whale in Arctic|left|thumb|Bowhead Whale in the Arctic. Bowhead Whales escape predation by punching holes under Arctic sea ice<ref name=":0">{{Cite journal|last=Huntington|first=Henry P.|date=21 March 2008|title=A preliminary assessment of threats to arctic marine mammals and their conservation in the coming decades|journal=Marine Policy|volume=33|issue=1|doi=10.1016/j.marpol.2008.04.003}}</ref>.]]

=== History and Status of Key Arctic Marine Mammals ===

==== Bowhead Whales ====
One of the few endemic whale species in the Arctic includes the Bowhead Whale, a population which experienced severe declines as a direct result of whaling, from an estimated peak of 50,000 to less than 3,000 by 1921<ref name=":1">{{Cite web|last=NOAA Fisheries|date=Accessed Fedbuary 15th, 2026|title=Bowhead Whale|url=https://www.fisheries.noaa.gov/species/bowhead-whale|url-status=live}}</ref>. After the end of commercial whaling, and the implementation of protections in the 1970s, many populations have since rebounded rapidly, with one subpopulation, the Bering-Chukchi-Beaufort, having rebounded to over 14,000 individuals<ref>{{Cite journal|last=Givens|first=Geof|last2=George|first2=J. Craig|last3=Suydam|first3=Robert|last4=Tudor|first4=Barbara|last5=Von Duyke|first5=Andrew|last6=Person|first6=Brian|date=April 11, 2023|title=Correcting the 2019 survey abundance of Bering-Chukchi-Beaufort Seas bowhead whales for disturbance from powered skiffs|journal=Journal of Cetacean Research and Management|volume=24|doi=10.47536/jcrm.v22i1.362}}</ref>. However, this rebound hasn’t been felt equally by all Bowhead Whale populations. The Okhotsk Sea population, for example, has only a few hundred individuals remaining, and is at heightened risk<ref name=":1" />. A key risk factor for Bowhead Whales is the rising of sea temperatures, and the loss of sea ice, which Bowhead Whales depend on for foraging and protection from predators<ref>{{Cite journal|last=de Greef|first=Evelien|last2=Müller|first2=Claudio|last3=Snead|first3=Anthony A.|last4=Rivkin|first4=Ruth L.|last5=Ferguson|first5=Steven H.|last6=Watt|first6=Cortney A.|last7=Marcoux|first7=Marianne|last8=Petersen|first8=Stephen D.|last9=Garroway|first9=Colin J.|date=March 2026|title=Identifying Areas of Potential Risk Based on Future Genetic Adaptability in Three Arctic Whale Species|journal=The American Naturalist|volume=207|issue=3|doi=10.1086/738889}}</ref>.

==== Narwhals & Beluga Whales ====
Additional notable Arctic marine mammals include Narwhals and Beluga Whales. In the Arctic Ocean, both of these animals rely heavily on the availibility of Arctic sea ice for many facets of their survival, including for foraging and protection from predation<ref name=":2">{{Cite journal|last=Williams|first=Terri M.|last2=Noren|first2=Shawn R.|last3=Glenn|first3=Mike|date=August 26th, 2010|title=Extreme physiological adaptations as predictors of climate-change sensitivity in the narwhal, Monodon monoceros|journal=Marine Mammal Science|volume=27|pages=2|doi=10.1111/j.1748-7692.2010.00408.xDigital Object Identifier (DOI)}}</ref>. Both marine mammals have been documented to use their ability to create or reach air pockets in thick ice to escape Killer Whales<ref name=":2" /><ref name=":4">{{Cite book|title=The World of the Arctic Whales: Belugas, Bowheads, and Narwhals|last=Paine|first=Stefani|publisher=Sierra Club Books|year=1997|isbn=0871569574, 9780871569578}}</ref>. The conservation status of both is similar, with both being considered of least concern on the IUCN Red list<ref>{{Cite web|last=Lowry|first=L.|last2=Reeves|first2=R.|last3=Laidre|first3=K.|date=June 22nd, 2017|title=Delphinapterus leucas. The IUCN Red List of Threatened Species|url=https://www.iucnredlist.org/species/6335/50352346|url-status=live|website=IUCN Red List|doi=10.2305/IUCN.UK.2017-3.RLTS.T6335A50352346.en}}</ref><ref>{{Cite web|last=Lowry|first=L.|last2=Laidre|first2=K.|last3=Reeves|first3=R.|date=July 3rd, 2017|title=Monodon monoceros. The IUCN Red List of Threatened Species|url=https://www.iucnredlist.org/species/13704/50367651|url-status=live|website=IUCN Red List|doi=10.2305/IUCN.UK.2017-3.RLTS.T13704A50367651.en}}</ref>. However, the status of these species varies significantly by population. One particularly threatened sub population in the Cook Inlet of Alaska, for example, has been in decline since the 1990s, having been historically descimated by whaling<ref name=":5">{{Cite journal|last=Shelden|first=Kim E. W.|last2=Rugh|first2=David J.|last3=Mahoney|first3=Barbara A.|last4=Dahlheim|first4=Amarilyn E.|title=Killer Whale Predation On Belugas in Cook Inlet, Alaska: Implications for a Depleted Population|url=https://web.archive.org/web/20121224211121/http://www.fakr.noaa.gov/protectedresources/whales/beluga/MMSKillerwhaleBeluga.pdf|dead-url=http://www.fakr.noaa.gov/protectedresources/whales/beluga/MMSKillerwhaleBeluga.pdf|journal=Marine Mammal Science|volume=19|issue=3}}</ref>.

== Threats to Marine Mammals in the Arctic Today ==

=== Current Threats ===
[[File:Shell Oil's Polar Pioneer Arctic Drilling Rig - West Seattle, Seattle, Washington.jpg|alt=Oil Drilling Rig in a Port|thumb|Polar Pioneer Arctic Drilling Rig, owned by Shell Oil. ]]
Presently, most marine Arctic mammal species are doing reasonably well, with most able to sustain small amounts of sport and subsistence hunting. However, several factors, namely disease, disruption from vessels, offshore oil extraction, direct and indirect fishery impacts, habitat and environmental changes, and algae blooms, threaten the stability of many Arctic species<ref name=":0" />. Nearly all of these factors are caused or exacerbated severely by human activity. One of the most extensive human effects in particular is climate change, which is currently affecting all parts of the Arctic and will continue to, especially through increasingly open water due to ice melting, as well as warmer water<ref>{{Cite news|url=https://www.amap.no/documents/doc/amap-assessment-report-arctic-pollution-issues/68|title=AMAP Assessment Report: Arctic Pollution Issues|last=AMAP|date=1998|isbn=82-7655-061-4}}</ref>. For many Arctic marine mammals, including narwhal, Beluga & Bowhead Whales, and seals, that rely on sea ice, the loss of Arctic sea ice poses a dire threat to their well-being<ref name=":0" />. The risks are heightened by the limited ability of specialized Arctic marine mammals to respond quickly to rapid environmental fluctuations, due to their long lifespans<ref name=":3" />. Further, the loss of sea ice presents an opportunity for outcrowding from marine mammals that typically live in the Arctic seasonally, including Orca and several whale species such as Fin and Humpback<ref name=":3">{{Cite journal|last=Moore|first=Sue P.|last2=Huntington|first2=Henry P.|date=March 1st, 2008|title=Arctic Marine Mammals and Climate Change: Impacts and Resilience|journal=Ecological Applications|volume=18|issue=sp2|doi=10.1890/06-0571.1}}</ref>.

== Impacts of Orca Hunting on Arctic Marine Mammals ==

=== '''Sea Ice in the Context of Killer Whale Hunting''' ===
For many permanent residents of the Arctic, including Bowhead Whales, Narwhals, and Beluga Whales<ref name=":0" /><ref name=":2" /><ref name=":4" /> , sea ice is crucial for evading predators that cannot spend prolonged periods of time underneath the ice. For example, Bowhead Whales are able to make air pockets underneath Arctic ice, which allows them to stay underneath the ice for prolonged periods, whereas Orcas are unable to do the same and would be unable to successfully hunt the Bowhead Whale<ref name=":0" />.

=== '''Increased Hunting Opportunities from Sea Ice Loss''' ===
[[File:Killer Whales Hunting a Seal.jpg|alt=Killer Whales hunting a seal, stranded on a small piece of ice|thumb|Killer Whales hunting a seal. Sea ice provides Arctic marine mammals with escape opportunities from Killer Whales, which are lost as Arctic sea ice melts. ]]Given the protections provided by sea ice, the loss of sea ice in the Arctic in notable in the changes this loss causes, in terms of Orca hunting opportunities. The melting of sea ice has increased the hunting opportunities for mammal-eating Brigg’s Killer Whales, so much so that predation from Killer Whales has become the biggest source of documented Bowhead Whale carcasses<ref>{{Cite journal|last=Willoughby|first=Amy L.|last2=Ferguson|first2=Megan C.|last3=Stimmelmayr|first3=Raphaela|last4=Clarke|first4=Janet T.|last5=Brower|first5=Amelia A.|date=September 10th, 2017|title=Bowhead whale (Balaena mysticetus) and killer whale (Orcinus orca) co-occurrence in the U.S. Pacific Arctic, 2009–2018: evidence from bowhead whale carcasses|journal=Polar Biology|volume=43|doi=10.1007/s00300-020-02734-y.}}</ref>. For Beluga Whales, predation by Killer Whales has become significant as well, with one population in Cook Inlet, Alaska, experiencing increased pressure from Killer Whale predation, despite their presence in the region historically being small<ref name=":5" />. It is for this reason that loss of sea ice is likely to prove beneficial largely for non-resident marine life, particularly orcas, in the Arctic, while permanent resident marine life is facing severe risk<ref name=":3" />. Addressing this issue ultimately requires a massive global-wide effort to curb climate change, as soon as possible. In the interim, to help support threatened marine life, more local effects should be pursued, such as reducing noise disruptions from vessels and curtailing offshore oil and gas drilling. These small-scale solutions can delay the worst effects for local Arctic residents, including endangered populations of Bowhead Whales<ref name=":0" />.
== Current Action ==
=== Protection Status ===
In 2008, the Killer whale population in the Eastern Arctic region was listed as a special concern under the Committee on the status of Endangered Wildlife in Canada (COSEWIC)<ref name=":8">{{Cite web|date=October 21st, 2024|title=Killer Whale (Orcinus orca): COSEWIC assessment and status report 2023|url=https://www.canada.ca/en/environment-climate-change/services/species-risk-public-registry/cosewic-assessments-status-reports/killer-whale-2023.html#toc6|url-status=live|website=Government of Canada}}</ref>. Later in 2023, they were reassessed and found to maintain the special concern status<ref name=":8" />. The special concern status describes populations that are at risk of becoming endangered or threatened, although not in imminent risk of extirpation<ref>{{Cite web|date=Accessed March 15th, 2026|title=Table 5. COSEWIC status categories|url=https://cosewic.ca/index.php/en/assessment-process/cosewic-assessment-process-categories-and-guidelines/status-categories.html|url-status=live}}</ref>. However, other populations, including the Southern resident orcas located off the Pacific west coast are considered endangered by COSEWIC<ref name=":8" />.
[[File:Arctic (orthographic projection).svg|thumb|235x235px|Map of the Arctic Ocean ]]

=== Conservation Strategies ===
Reproduction for orcas is relatively slow, with generation time being around 29 years for populations in the Arctic<ref name=":8" />. Thus, recovery from low population rates is expected to take time, even with protection measures in place. Many conservation projects and policies are being put into place in the Arctic to help ecosystems withstand the impacts of climate change and industrial activity, although their effectiveness has not yet been assessed. Due to their non critically endangered status, little protection specific to orcas have been put in place in the Arctic, but rather broad actions to preserve the entire ecosystem.

With the Arctic ecosystem rapidly changing, strong concerns have emerged for long term food availability for all species, including Orcas<ref name=":9">{{Cite journal|last=Misund|first=Ole|last2=Hop|first2=Haakon|last3=Quillfeldt|first3=Cecile|date=October 1st, 2025|title=Area based management in polar oceans for biodiversity conservation and enhanced sustainability of fisheries.|url=https://doi.org/10.3389/focsu.2025.1634989|journal=Frontier in Ocean Sustainability|volume=Vol 615|pages=pp. 373}}</ref>. As ice melts, marine areas previously restricted become more accessible<ref name=":9" />. This is likely to cause more unregulated overfishing, putting even more pressure on an already vulnerable ecosystem<ref name=":9" />. The Central Arctic Ocean Fisheries Agreement was implemented in 2021 with the goal of minimizing damage to food chains in the Arctic<ref name=":9" />. The eight countries involved; Canada, the United States, Russia, Finland, Sweden, Denmark, Norway and Iceland, have agreed to ban commercial fishing from the designated Marine Protected area for at least 15 years until resource availability has been assessed and mapped<ref name=":9" />. Prohibiting fishing from designed areas leaves more fish resources for the several endangered species in the Arctic, including Bowhead whales and narwhals<ref name=":9" />. This protection measure does not however address the growing concern of food chain disimbalance caused by increased opportunities for orcas to hunt their prey as they migrate further into the Arctic.

Much of the world’s oceans are beyond National control<ref name=":7" />. Despite the CAOFA fishing ban, the Arctic remains vulnerable to other exploitative activities such as deep sea mining and shipping routes. In January 2026, the High Seas Treaty, an international agreement was put into force to safeguard oceans across the world from harmful commercial activities under the UN convention of the Law and the Seas <ref name=":6">{{Cite news|url=https://unu.edu/ehs/article/what-high-seas-treaty-and-why-it-important|title=What is the High Seas Treaty and Why is it Important?|date=January 16th, 2026|work=UNU EHS|access-date=Accessed April 11th, 2026}}</ref>. With this treaty in place, companies planning projects in the ocean will need to carry out environmental assessments prior to taking any action<ref name=":7" />. Furthermore, the treaty creates more opportunities to establish more marine protected areas<ref name=":7">{{Cite journal|date=March 16th, 2023|title=How science can fill the gaps of the high seas treaty|url=https://www.nature.com/articles/d41586-023-00757-z.pdf|journal=Nature|volume=Vol. 615|pages=373}}</ref>. Though in its early stages of progress, this is considered one of the most ambitious attempts at safeguarding oceans from habitat destruction and biodiversity loss. Governing, financing and monitoring mechanisms of the treaty are anticipated to be discussed in April of 2026<ref name=":6" />. Many non profit organizations and conservation groups are also taking part in the initiative. For instance, the WWF has developed ActNet, a framework of databases that has mapped out priority areas for conservation for once the treaty is put into action<ref>{{Cite web|date=March 13th, 2026|title=ActNet|url=https://www.arcticwwf.org/our-priorities/arcnet/|url-status=live|website=WWF Arctic}}</ref>. Although many recent advancement in Arctic conservation have been substantial, much more work is needed to ensure the protection of its biodiversity.

==Future Considerations ==
To mitigate the ecological impacts associated with the increasing presence of orcas in Arctic ecosystems, management approaches that incorporate technical, cultural, social, and political perspectives must be addressed.

=== '''Technical Solutions''' ===
Declining sea ice is enabling the increased presence of orcas—apex predators—in Arctic marine ecosystems, where their predation has the potential to significantly alter existing food-web dynamics. Monitoring technologies that track orca distribution, population and sea ice conditions can provide early warnings of ecosystem changes and inform conservation planning. In the Arctic, orcas are predators with "large and versatile ranges, giving them the potential to significantly impact populations and marine configurations"<ref name=":11" />. Orcas exhibit high levels of intelligence that allow them to capture prey efficiently, emphasizing the need for continued monitoring of their ecological interactions and environmental impacts<ref>''Orcas and dolphins seen hunting together for the first time''. UBC Science. (n.d.). <nowiki>https://science.ubc.ca/news/2025-12/orcas-and-dolphins-seen-hunting-together-first-time</nowiki> </ref>. A study published in ''Polar Biology'' analyzed acoustic recordings from eight Arctic monitoring sites between 2011 and 2019 and detected orca vocalizations across the region, identifying periods of time when they were present<ref name=":11" />. A similar study uses passive acoustic monitoring as an effective and non-invasive method to observe orca distribution and residency patterns, detecting seasonal patterns<ref>Myers, H. J., Olsen, D. W., Matkin, C. O., Horstmann, L. A., & Konar, B. (2021, October 13). ''Passive acoustic monitoring of Killer Whales (Orcinus orca) reveals year-round distribution and residency patterns in the Gulf of Alaska''. Nature News. <nowiki>https://www.nature.com/articles/s41598-021-99668-0</nowiki> </ref>. In addition to acoustic monitoring, satellite tagging further works to track movement in the Arctic. In the eastern Canadian Arctic, satellite telemetry reveals how orcas navigated long-distance travel, actively avoiding sea ice. These tracking methods extend research knowledge on migration routes and habitat use, providing long-term data on how these predators move into newly accessible Arctic waters as sea ice declines. In contrast to direct observation, combining historical sighting records and sea-ice data in Hudson Bay illustrates how environmental changes can be used to track orca presence and distribution. Sea ice previously acted as a “barrier”, limiting orca movement into Arctic waters; however, as ice declined, sightings increased exponentially<ref name=":12" />. Climate monitoring allows for predictions on where predator expansion may occur, and understanding ice dynamics helps forecast future ecosystem changes. Technical solutions help scientists better understand when and where orcas enter Arctic ecosystems, while also showing the ecological consequences of increased predation on Arctic marine mammals such as narwhal, beluga, and bowhead whales, which have historically relied on sea ice as a refuge from predators. Increasing awareness and conservation incentives surrounding these issues can help promote the long-term stability of Arctic marine ecosystems.

=== '''Cultural and Social Collaboration''' ===
While modern technological advances provide insight on how predator and prey relationships can be sustainably managed, these methods are relatively new and still developing. For long-term impact, conservation planning should involve collaboration with Indigenous communities in Arctic regions, recognizing their long-standing relationship with local ecosystems and their deep knowledge of sustainable marine stewardship. Integrating Indigenous knowledge systems alongside scientific research ensures effective and respectful approaches to marine conservation. By applying traditional ecological knowledge, Inuit hunters documented orca predation on multiple marine species—including beluga whales, narwhals, bowhead whales, seals, and walruses—offering behavioural observations that are otherwise difficult to obtain through scientific research alone<ref name=":1" />. Furthermore, beyond ecological impacts, orca predation is deeply interlinked with social and cultural implications. Given the cultural and economic importance of marine mammals for subsistence, Inuit hunters have raised concerns about potential declines in their populations<ref name=":1" />. These concerns stem from long-standing community dependence on environmental stability, through which Inuit hunters have developed extensive ecological knowledge and observations that serve as a reliable foundation for sustainable ecosystem management. Integrating traditional ecological knowledge with scientific research can improve environmental monitoring as community observations provide long-term ecological records that complement short-term scientific datasets<ref>Integrating traditional ecological knowledge with scientific research can improve environmental monitoring, as community observations provide long-term ecological records that complement short-term scientific datasets (Proulx et al., 2021).</ref>.

=== '''Policy and Management''' ===
Evidence of shifting orca distribution is measurable through visible scarring on prey species, such as bowhead whales, indicating significant predatory impacts<ref>Willoughby, A. L., Ferguson, M. C., Stimmelmayr, R., Clarke, J. T., & Brower, A. A. (2020). ''Bowhead whale (Balaena mysticetus) and killer whale (Orcinus orca) co-occurrence in the U.S. Pacific Arctic, 2009–2018: Evidence from bowhead whale carcasses''. Polar Biology, 43, 1669–1679.</ref>. The frequency of these occurrences suggests that greater protective measures are necessary to safeguard Arctic marine ecosystems, particularly through Arctic management and conservation policies. Protected areas and conservation policies enable governments to limit additional human pressures that may intensify instability in marine ecosystems and populations. Well-managed marine protected areas have been shown to support significantly higher biomass and species density compared to unprotected regions, demonstrating their role in enhancing ecosystem stability<ref>Edgar, G. J., Stuart-Smith, R. D., Willis, T. J., Kininmonth, S., Baker, S. C., Banks, S., Barrett, N. S., Becerro, M. A., Bernard, A. T. F., Berkhout, J., Buxton, C. D., Campbell, S. J., Cooper, A. T., Davey, M., Edgar, S. C., Försterra, G., Galván, D. E., Irigoyen, A. J., Kushner, D. J., … Thomson, R. J. (2014). Global conservation outcomes depend on marine protected areas with five key features. Nature, 506(7487), 216–220. <nowiki>https://doi.org/10.1038/nature13022</nowiki></ref>. In addition to strengthening ecosystem resilience, these protected areas improve ecological interactions within marine food webs while limiting human stressors such as fishing and habitat disturbance<ref>Halpern, B. S., Lester, S. E., McLeod, K. L., & Gaines, S. D. (2010). Placing marine protected areas onto the ecosystem-based management seascape. ''Proceedings of the National Academy of Sciences of the United States of America'', ''107''(43), 18312–18317. <nowiki>http://www.jstor.org/stable/25748486</nowiki></ref>. Although protected areas cannot directly prevent the climate-driven range expansion of orcas, they can help maintain stable prey populations by reducing additional human pressures, thereby enhancing the resilience of Arctic marine ecosystems facing increasing predation stress.

Addressing the ecological impacts of orca range expansion will require integrated management strategies that account for both environmental and human dimensions.

==Conclusion==
In conclusion, climate change is significantly reshaping Arctic marine ecosystems, particularly through the continued decline of sea ice. As more areas become accessible due to melting ice, orcas are expanding their range, which shifts the existing ecological balance of the region. Many Arctic marine mammals that historically relied on sea ice for feeding and protection are now facing new predatory pressures. Current conservation policies, such as the Central Arctic Ocean Fisheries Agreement (CAOFA) and various monitoring programs, aim to reduce additional stress on these ecosystems. However, ongoing environmental change continues to create new challenges for Arctic biodiversity. Effectively managing these changes will require a combination of technical monitoring and collaboration with Indigenous communities to integrate traditional ecological knowledge. Ultimately, ongoing research will be essential for understanding the long-term impacts of orca activity and ensuring stability of Arctic marine ecosystems in a warming world.

==References==
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[[Category:Conservation]]

Course:CONS200/2026WT2/Orcas (Orcinus orca) and climate change in the Arctic: Status and impact

2026-04-13T05:43:28Z

AveryFishman: Added Introduction

Orcas (''Orcinus orca''), or killer whales, are apex marine predators found in oceans worldwide, including seasonally in Arctic waters. Historically, extensive sea ice acted as a physical barrier that limited the movement of orcas into much of the Arctic, restricting their access to prey species that inhabit environments covered with ice. However, climate change caused rising Arctic temperatures and significant declines in sea ice, which decreased by approximately 12.2% per decade since 1979<ref>{{Cite journal|last=Filatova|first=Olga A.|last2=Shpak|first2=Olga V.|last3=Ivkovich|first3=Tatiana V.|last4=Volkova|first4=Evgeniia V.|last5=Fedutin|first5=Ivan D.|last6=Ovsyanikova|first6=Ekaterina N.|last7=Burdin|first7=Alexander M.|last8=Hoyt|first8=Erich|date=March 23rd 2019|title=Large-scale habitat segregation of fish-eating and mammal-eating killer whales (Orcinus orca) in the western North Pacific|journal=Polar Biology|volume=42|doi=10.1007/s00300-019-02484-6}}</ref><ref name=":10" />. As this decline rate shows, orcas have increasingly been observed moving further into Arctic regions that were previously difficult to access<ref name=":11">{{Cite journal|last=Kimber|first=Brynn M.|last2=Braen|first2=Eric K.|last3=Wright|first3=Dana L.|last4=Harlacher|first4=Jenna M.|last5=Crance|first5=Jessica L.|last6=Berchok|first6=Catherine L.|date=January 6th, 2025|title=Less ice, more predators: passive acoustic monitoring shows variation in killer whale (Orcinus orca) presence in the U.S. Arctic with declining sea ice|journal=Polar Biology|volume=41|issue=21|pages=2|doi=10.1007/s00300-024-03332-y}}</ref>. This range expansion has raised ecological concerns because many Arctic marine mammals, such as bowhead whales and other species, used to rely on sea ice for protection against their predators<ref name=":12">{{Cite journal|last=Higdon|first=Jeff W|last2=Ferguson|first2=Steven H|date=July 19th, 2009|title=Loss of Arctic sea ice causing punctuated change in sightings of killer whales (Orcinus orca) over the past century|journal=National Library of Medicine|doi=10.1890/07-1941.1}}</ref>. In addition, these changes in ocean temperature and sea ice conditions are influencing the distribution of marine species, which may shift the predator-prey dynamics and the structure of Arctic marine food webs<ref>{{Cite journal|last=Laidre|first=Kristin L.|last2=Stern|first2=Harry|last3=Kovacs|first3=Kit M.|last4=Lowry|first4=Lloyd|last5=Moore|first5=Sue E.|last6=Regehr|first6=Eric V.|last7=Ferguson|first7=Steven H.|last8=Wiig|first8=Øystein|title=Arctic marine mammal population status, sea ice habitat loss, and conservation recommendations for the 21st century|journal=Conservation Biology|volume=29|issue=3|doi=10.1111/cobi.12474}}</ref>. Understanding how climate change affects orca distribution and their interactions with other Arctic marine mammals is essential for assessing the broader ecological changes occurring in the ecosystem. The following sections examine the background and ecological impacts of expanding orca presence in the Arctic, review current conservation policies like the Central Arctic Ocean Fisheries Agreement (CAOFA) along with its management efforts, and discuss potential strategies for addressing these emerging ecological challenges.

== Background on Orcas & The Arctic ==
=== Arctic Sea Ice Loss ===
Arctic sea ice has declined by ~12.2% per decade since 1979, as a result of the ocean warming caused by climate change<ref>{{Cite web|last=NASA|date=January 15, 2026|title=Arctic Sea Ice Minimum Extent - Earth Indicator|url=https://science.nasa.gov/earth/explore/earth-indicators/arctic-sea-ice-minimum-extent/|url-status=live}}</ref>. Though sea ice losses have remained relatively minimal in the past 20 years, estimates suggest that this slowed loss is only a temporary effect of a natural fluctuation in climate, and that sea ice will eventually resume<ref>{{Cite web|last=Carrington|first=Damian|date=August 20th, 2025|title=Dramatic slowdown in melting of Arctic sea ice surprises scientists|url=https://www.theguardian.com/environment/2025/aug/20/slowdown-in-melting-of-arctic-sea-ice-surprises-scientists|url-status=live|website=The Guardian}}</ref>. Further, once this temporary ice loss ends, expected by 2035 at the latest, there are heightened chances of an accelerated loss of Arctic sea ice<ref name=":10">{{Cite journal|last=England|first=M. R.|last2=Polvani|first2=L. M.|last3=Screen|first3=J.|last4=Chan|first4=A. C.|date=August 5th, 2025|title=Minimal Arctic Sea Ice Loss in the Last 20 Years, Consistent With Internal Climate Variability|journal=Geophysical Research Letters|volume=52|doi=10.1029/2025GL116175}}</ref>. This data suggests that the effects of sea ice losses in the Arctic have the potential to significantly worsen, which poses a significant risk to an Arctic that has already experienced significant losses in sea ice over the past 50 years, of over 10,000 km3<ref>{{Cite journal|last=Kwok|first=R.|date=October 12th, 2018|title=Arctic sea ice thickness, volume, and multiyear ice coverage: losses and coupled variability (1958–2018)|journal=Environmental Research Letters|volume=13|pages=105005|doi=10.1088/1748-9326/aae3ec}}</ref>. This decline in ice naturally results in a more open sea, which creates an extended range for orca populations<ref>{{Cite journal|last=Kimber|first=Brynn|last2=Harlacher|first2=Jenna|last3=Braen|first3=Eric|last4=Berchok|first4=Catherine|date=October 1st, 2021|title=Tracking killer whale movements in the Alaskan Arctic relative to a loss of sea ice|journal=The Journal of the Acoustial Society of America|volume=150|issue=4|doi=doi.org/10.1121/10.0008306}}</ref>.

=== History and Status of Orcas ===
[[File:Dorsal fin of a killer whale 03.jpg|alt=Dorsal Fin of a Killer Whale|thumb|Dorsal fin of a Killer Whale found close to the coast.]]The status of orca populations is difficult to quantify, largely because there remains an ongoing debate as to whether transient orcas (often called Brigg’s Killer Whales) and Southern Resident orcas, currently both considered subspecies of orca, should be classified as separate species<ref>{{Cite journal|last=Morin|first=Phillip A.|last2=McCarthy|first2=Morgan L.|last3=Fung|first3=Charissa W.|last4=Durban|first4=John W.|last5=Parsons|first5=Kim M.|last6=Perrin|first6=William F.|last7=Taylor|first7=Barbara L.|last8=Jefferson|first8=Thomas A.|last9=Archer|first9=Freckdrick I.|date=27 March 2024|title=Revised taxonomy of eastern North Pacific killer whales (Orcinus orca): Bigg’s and resident ecotypes deserve species status|journal=Royal Scoiety Open Science|volume=11|issue=3|doi=10.1098/rsos.231368}}</ref>. Transient orcas are currently considered to be thriving, while Southern Resident orcas, in particular, face the largest risks of extinction, primarily due to pollutants accumulated from the fish eaten by residents, disturbance from marine vessels, and the availability of salmon as a food source<ref>{{Cite web|last=NOAA Fisheries|date=September 2nd, 2025|title=Saving the Southern Resident Killer Whales|url=https://www.fisheries.noaa.gov/west-coast/endangered-species-conservation/saving-southern-resident-killer-whales|url-status=live}}</ref>. Mammal-eating Brigg’s Killer Whale populations, meanwhile, have consistently grown for decades, with the population off the coast of British Columbia having more than doubled in size to over 500 individuals since 1990<ref>{{Cite journal|last=Fisheries and Oceans Canada|date=July 2013|title=Information In Support of the Identification of Critical Habitatat for Transient Killer Whales (Orcinus Orca) Off the West Coast of Canada|url=https://waves-vagues.dfo-mpo.gc.ca/Library/349619.pdf|journal=Science Advisory Report}}</ref>. However, Brigg’s Killer Whales still face threats from pollutants and vessel activity, as do residents, with vessel activity potentially impacting Brigg’s ability to hunt<ref>{{Cite journal|last=Jourdain|first=Eve|last2=Goh|first2=Tiffany|last3=Kuningas|first3=Sanna|last4=Simila|first4=Tiu|last5=Vongraven|first5=Dag|last6=Karoliussen|first6=Richard|last7=Bisther|first7=Anna|last8=Hammond|first8=Phillip J|date=November 18th 2021|title=Killer whale (Orcinus orca) population dynamics in response to a period of rapid ecosystem change in the eastern North Atlantic|journal=Ecology and Evolution|volume=11|issue=23|doi=10.1002/ece3.8364Digital Object Identifier (DOI)}}</ref>. Given the relatively reliable growth of Brigg’s transient Killer Whales however, in addition to the extension of the orca’s typical range, there are important implications for other mammal species in the Arctic.
[[File:Bowhead Whale NOAA.jpg|alt=Lone Bowhead Whale in Arctic|left|thumb|Bowhead Whale in the Arctic. Bowhead Whales escape predation by punching holes under Arctic sea ice<ref name=":0">{{Cite journal|last=Huntington|first=Henry P.|date=21 March 2008|title=A preliminary assessment of threats to arctic marine mammals and their conservation in the coming decades|journal=Marine Policy|volume=33|issue=1|doi=10.1016/j.marpol.2008.04.003}}</ref>.]]

=== History and Status of Key Arctic Marine Mammals ===

==== Bowhead Whales ====
One of the few endemic whale species in the Arctic includes the Bowhead Whale, a population which experienced severe declines as a direct result of whaling, from an estimated peak of 50,000 to less than 3,000 by 1921<ref name=":1">{{Cite web|last=NOAA Fisheries|date=Accessed Fedbuary 15th, 2026|title=Bowhead Whale|url=https://www.fisheries.noaa.gov/species/bowhead-whale|url-status=live}}</ref>. After the end of commercial whaling, and the implementation of protections in the 1970s, many populations have since rebounded rapidly, with one subpopulation, the Bering-Chukchi-Beaufort, having rebounded to over 14,000 individuals<ref>{{Cite journal|last=Givens|first=Geof|last2=George|first2=J. Craig|last3=Suydam|first3=Robert|last4=Tudor|first4=Barbara|last5=Von Duyke|first5=Andrew|last6=Person|first6=Brian|date=April 11, 2023|title=Correcting the 2019 survey abundance of Bering-Chukchi-Beaufort Seas bowhead whales for disturbance from powered skiffs|journal=Journal of Cetacean Research and Management|volume=24|doi=10.47536/jcrm.v22i1.362}}</ref>. However, this rebound hasn’t been felt equally by all Bowhead Whale populations. The Okhotsk Sea population, for example, has only a few hundred individuals remaining, and is at heightened risk<ref name=":1" />. A key risk factor for Bowhead Whales is the rising of sea temperatures, and the loss of sea ice, which Bowhead Whales depend on for foraging and protection from predators<ref>{{Cite journal|last=de Greef|first=Evelien|last2=Müller|first2=Claudio|last3=Snead|first3=Anthony A.|last4=Rivkin|first4=Ruth L.|last5=Ferguson|first5=Steven H.|last6=Watt|first6=Cortney A.|last7=Marcoux|first7=Marianne|last8=Petersen|first8=Stephen D.|last9=Garroway|first9=Colin J.|date=March 2026|title=Identifying Areas of Potential Risk Based on Future Genetic Adaptability in Three Arctic Whale Species|journal=The American Naturalist|volume=207|issue=3|doi=10.1086/738889}}</ref>.

==== Narwhals & Beluga Whales ====
Additional notable Arctic marine mammals include Narwhals and Beluga Whales. In the Arctic Ocean, both of these animals rely heavily on the availibility of Arctic sea ice for many facets of their survival, including for foraging and protection from predation<ref name=":2">{{Cite journal|last=Williams|first=Terri M.|last2=Noren|first2=Shawn R.|last3=Glenn|first3=Mike|date=August 26th, 2010|title=Extreme physiological adaptations as predictors of climate-change sensitivity in the narwhal, Monodon monoceros|journal=Marine Mammal Science|volume=27|pages=2|doi=10.1111/j.1748-7692.2010.00408.xDigital Object Identifier (DOI)}}</ref>. Both marine mammals have been documented to use their ability to create or reach air pockets in thick ice to escape Killer Whales<ref name=":2" /><ref name=":4">{{Cite book|title=The World of the Arctic Whales: Belugas, Bowheads, and Narwhals|last=Paine|first=Stefani|publisher=Sierra Club Books|year=1997|isbn=0871569574, 9780871569578}}</ref>. The conservation status of both is similar, with both being considered of least concern on the IUCN Red list<ref>{{Cite web|last=Lowry|first=L.|last2=Reeves|first2=R.|last3=Laidre|first3=K.|date=June 22nd, 2017|title=Delphinapterus leucas. The IUCN Red List of Threatened Species|url=https://www.iucnredlist.org/species/6335/50352346|url-status=live|website=IUCN Red List|doi=10.2305/IUCN.UK.2017-3.RLTS.T6335A50352346.en}}</ref><ref>{{Cite web|last=Lowry|first=L.|last2=Laidre|first2=K.|last3=Reeves|first3=R.|date=July 3rd, 2017|title=Monodon monoceros. The IUCN Red List of Threatened Species|url=https://www.iucnredlist.org/species/13704/50367651|url-status=live|website=IUCN Red List|doi=10.2305/IUCN.UK.2017-3.RLTS.T13704A50367651.en}}</ref>. However, the status of these species varies significantly by population. One particularly threatened sub population in the Cook Inlet of Alaska, for example, has been in decline since the 1990s, having been historically descimated by whaling<ref name=":5">{{Cite journal|last=Shelden|first=Kim E. W.|last2=Rugh|first2=David J.|last3=Mahoney|first3=Barbara A.|last4=Dahlheim|first4=Amarilyn E.|title=Killer Whale Predation On Belugas in Cook Inlet, Alaska: Implications for a Depleted Population|url=https://web.archive.org/web/20121224211121/http://www.fakr.noaa.gov/protectedresources/whales/beluga/MMSKillerwhaleBeluga.pdf|dead-url=http://www.fakr.noaa.gov/protectedresources/whales/beluga/MMSKillerwhaleBeluga.pdf|journal=Marine Mammal Science|volume=19|issue=3}}</ref>.

== Threats to Marine Mammals in the Arctic Today ==

=== Current Threats ===
[[File:Shell Oil's Polar Pioneer Arctic Drilling Rig - West Seattle, Seattle, Washington.jpg|alt=Oil Drilling Rig in a Port|thumb|Polar Pioneer Arctic Drilling Rig, owned by Shell Oil. ]]
Presently, most marine Arctic mammal species are doing reasonably well, with most able to sustain small amounts of sport and subsistence hunting. However, several factors, namely disease, disruption from vessels, offshore oil extraction, direct and indirect fishery impacts, habitat and environmental changes, and algae blooms, threaten the stability of many Arctic species<ref name=":0" />. Nearly all of these factors are caused or exacerbated severely by human activity. One of the most extensive human effects in particular is climate change, which is currently affecting all parts of the Arctic and will continue to, especially through increasingly open water due to ice melting, as well as warmer water<ref>{{Cite news|url=https://www.amap.no/documents/doc/amap-assessment-report-arctic-pollution-issues/68|title=AMAP Assessment Report: Arctic Pollution Issues|last=AMAP|date=1998|isbn=82-7655-061-4}}</ref>. For many Arctic marine mammals, including narwhal, Beluga & Bowhead Whales, and seals, that rely on sea ice, the loss of Arctic sea ice poses a dire threat to their well-being<ref name=":0" />. The risks are heightened by the limited ability of specialized Arctic marine mammals to respond quickly to rapid environmental fluctuations, due to their long lifespans<ref name=":3" />. Further, the loss of sea ice presents an opportunity for outcrowding from marine mammals that typically live in the Arctic seasonally, including Orca and several whale species such as Fin and Humpback<ref name=":3">{{Cite journal|last=Moore|first=Sue P.|last2=Huntington|first2=Henry P.|date=March 1st, 2008|title=Arctic Marine Mammals and Climate Change: Impacts and Resilience|journal=Ecological Applications|volume=18|issue=sp2|doi=10.1890/06-0571.1}}</ref>.

== Impacts of Orca Hunting on Arctic Marine Mammals ==

=== '''Sea Ice in the Context of Killer Whale Hunting''' ===
For many permanent residents of the Arctic, including Bowhead Whales, Narwhals, and Beluga Whales<ref name=":0" /><ref name=":2" /><ref name=":4" /> , sea ice is crucial for evading predators that cannot spend prolonged periods of time underneath the ice. For example, Bowhead Whales are able to make air pockets underneath Arctic ice, which allows them to stay underneath the ice for prolonged periods, whereas Orcas are unable to do the same and would be unable to successfully hunt the Bowhead Whale<ref name=":0" />.

=== '''Increased Hunting Opportunities from Sea Ice Loss''' ===
[[File:Killer Whales Hunting a Seal.jpg|alt=Killer Whales hunting a seal, stranded on a small piece of ice|thumb|Killer Whales hunting a seal. Sea ice provides Arctic marine mammals with escape opportunities from Killer Whales, which are lost as Arctic sea ice melts. ]]Given the protections provided by sea ice, the loss of sea ice in the Arctic in notable in the changes this loss causes, in terms of Orca hunting opportunities. The melting of sea ice has increased the hunting opportunities for mammal-eating Brigg’s Killer Whales, so much so that predation from Killer Whales has become the biggest source of documented Bowhead Whale carcasses<ref>{{Cite journal|last=Willoughby|first=Amy L.|last2=Ferguson|first2=Megan C.|last3=Stimmelmayr|first3=Raphaela|last4=Clarke|first4=Janet T.|last5=Brower|first5=Amelia A.|date=September 10th, 2017|title=Bowhead whale (Balaena mysticetus) and killer whale (Orcinus orca) co-occurrence in the U.S. Pacific Arctic, 2009–2018: evidence from bowhead whale carcasses|journal=Polar Biology|volume=43|doi=10.1007/s00300-020-02734-y.}}</ref>. For Beluga Whales, predation by Killer Whales has become significant as well, with one population in Cook Inlet, Alaska, experiencing increased pressure from Killer Whale predation, despite their presence in the region historically being small<ref name=":5" />. It is for this reason that loss of sea ice is likely to prove beneficial largely for non-resident marine life, particularly orcas, in the Arctic, while permanent resident marine life is facing severe risk<ref name=":3" />. Addressing this issue ultimately requires a massive global-wide effort to curb climate change, as soon as possible. In the interim, to help support threatened marine life, more local effects should be pursued, such as reducing noise disruptions from vessels and curtailing offshore oil and gas drilling. These small-scale solutions can delay the worst effects for local Arctic residents, including endangered populations of Bowhead Whales<ref name=":0" />.
== Current Action ==
=== Protection Status ===
In 2008, the Killer whale population in the Eastern Arctic region was listed as a special concern under the [https://en.wikipedia.org/wiki/Committee_on_the_Status_of_Endangered_Wildlife_in_Canada Committee on the status of Endangered Wildlife in Canada] (COSEWIC)<ref name=":8">{{Cite web|date=October 21st, 2024|title=Killer Whale (Orcinus orca): COSEWIC assessment and status report 2023|url=https://www.canada.ca/en/environment-climate-change/services/species-risk-public-registry/cosewic-assessments-status-reports/killer-whale-2023.html#toc6|url-status=live|website=Government of Canada}}</ref>. Later in 2023, they were reassessed and found to maintain the special concern status<ref name=":8" />. The special concern status describes populations that are at risk of becoming endangered or threatened, although not in imminent risk of extirpation<ref>{{Cite web|date=Accessed March 15th, 2026|title=Table 5. COSEWIC status categories|url=https://cosewic.ca/index.php/en/assessment-process/cosewic-assessment-process-categories-and-guidelines/status-categories.html|url-status=live}}</ref>. However, other populations, including the [https://en.wikipedia.org/wiki/Southern_resident_orcas Southern resident orcas] located off the Pacific west coast are considered endangered by COSEWIC<ref name=":8" />.
[[File:Arctic (orthographic projection).svg|thumb|235x235px|Map of the Arctic Ocean ]]

=== Conservation Strategies ===
Reproduction for orcas is relatively slow, with generation time being around 29 years for populations in the Arctic<ref name=":8" />. Thus, recovery from low population rates is expected to take time, even with protection measures in place. Many conservation projects and policies are being put into place in the Arctic to help ecosystems withstand the impacts of climate change and industrial activity, although their effectiveness has not yet been assessed. Due to their non critically endangered status, little protection specific to orcas have been put in place in the Arctic, but rather broad actions to preserve the entire ecosystem.

With the Arctic ecosystem rapidly changing, strong concerns have emerged for long term food availability for all species, including Orcas<ref name=":9">{{Cite journal|last=Misund|first=Ole|last2=Hop|first2=Haakon|last3=Quillfeldt|first3=Cecile|date=October 1st, 2025|title=Area based management in polar oceans for biodiversity conservation and enhanced sustainability of fisheries.|url=https://doi.org/10.3389/focsu.2025.1634989|journal=Frontier in Ocean Sustainability|volume=Vol 615|pages=pp. 373}}</ref>. As ice melts, marine areas previously restricted become more accessible<ref name=":9" />. This is likely to cause more unregulated overfishing, putting even more pressure on an already vulnerable ecosystem<ref name=":9" />. The Central Arctic Ocean Fisheries Agreement was implemented in 2021 with the goal of minimizing damage to food chains in the Arctic<ref name=":9" />. The eight countries involved; Canada, the United States, Russia, Finland, Sweden, Denmark, Norway and Iceland, have agreed to ban commercial fishing from the designated Marine Protected area for at least 15 years until resource availability has been assessed and mapped<ref name=":9" />. Prohibiting fishing from designed areas leaves more fish resources for the several endangered species in the Arctic, including [https://en.wikipedia.org/wiki/Bowhead_whale Bowhead whales] and narwhals<ref name=":9" />. This protection measure does not however address the growing concern of food chain disimbalance caused by increased opportunities for orcas to hunt their prey as they migrate further into the Arctic.

Much of the world’s oceans are beyond National control<ref name=":7" />. Despite the CAOFA fishing ban, the Arctic remains vulnerable to other exploitative activities such as deep sea mining and shipping routes. In January 2026, the [https://en.wikipedia.org/wiki/High_Seas_Treaty High Seas Treaty], an international agreement was put into force to safeguard oceans across the world from harmful commercial activities under the [https://en.wikipedia.org/wiki/United_Nations_Convention_on_the_Law_of_the_Sea UN convention of the Law and the Seas]<ref name=":6">{{Cite news|url=https://unu.edu/ehs/article/what-high-seas-treaty-and-why-it-important|title=What is the High Seas Treaty and Why is it Important?|date=January 16th, 2026|work=UNU EHS|access-date=Accessed April 11th, 2026}}</ref>. With this treaty in place, companies planning projects in the ocean will need to carry out environmental assessments prior to taking any action<ref name=":7" />. Furthermore, the treaty creates more opportunities to establish more marine protected areas<ref name=":7">{{Cite journal|date=March 16th, 2023|title=How science can fill the gaps of the high seas treaty|url=https://www.nature.com/articles/d41586-023-00757-z.pdf|journal=Nature|volume=Vol. 615|pages=373}}</ref>. Though in its early stages of progress, this is considered one of the most ambitious attempts at safeguarding oceans from habitat destruction and biodiversity loss. Governing, financing and monitoring mechanisms of the treaty are anticipated to be discussed in April of 2026<ref name=":6" />. Many non profit organizations and conservation groups are also taking part in the initiative. For instance, the [https://en.wikipedia.org/wiki/World_Wide_Fund_for_Nature WWF] has developed ActNet, a framework of databases that has mapped out priority areas for conservation for once the treaty is put into action<ref>{{Cite web|date=March 13th, 2026|title=ActNet|url=https://www.arcticwwf.org/our-priorities/arcnet/|url-status=live|website=WWF Arctic}}</ref>. Although many recent advancement in Arctic conservation have been substantial, much more work is needed to ensure the protection of its biodiversity.

==Future Considerations ==
To mitigate the ecological impacts associated with the increasing presence of orcas in Arctic ecosystems, management approaches that incorporate technical, cultural, social, and political perspectives must be addressed.

=== '''Technical Solutions''' ===
Declining sea ice is enabling the increased presence of orcas—apex predators—in Arctic marine ecosystems, where their predation has the potential to significantly alter existing food-web dynamics. Monitoring technologies that track orca distribution, population and sea ice conditions can provide early warnings of ecosystem changes and inform conservation planning. In the Arctic, orcas are predators with "large and versatile ranges, giving them the potential to significantly impact populations and marine configurations"<ref name=":11" />. Orcas exhibit high levels of intelligence that allow them to capture prey efficiently, emphasizing the need for continued monitoring of their ecological interactions and environmental impacts<ref>''Orcas and dolphins seen hunting together for the first time''. UBC Science. (n.d.). <nowiki>https://science.ubc.ca/news/2025-12/orcas-and-dolphins-seen-hunting-together-first-time</nowiki> </ref>. A study published in ''Polar Biology'' analyzed acoustic recordings from eight Arctic monitoring sites between 2011 and 2019 and detected orca vocalizations across the region, identifying periods of time when they were present<ref name=":11" />. A similar study uses passive acoustic monitoring as an effective and non-invasive method to observe orca distribution and residency patterns, detecting seasonal patterns<ref>Myers, H. J., Olsen, D. W., Matkin, C. O., Horstmann, L. A., & Konar, B. (2021, October 13). ''Passive acoustic monitoring of Killer Whales (Orcinus orca) reveals year-round distribution and residency patterns in the Gulf of Alaska''. Nature News. <nowiki>https://www.nature.com/articles/s41598-021-99668-0</nowiki> </ref>. In addition to acoustic monitoring, satellite tagging further works to track movement in the Arctic. In the eastern Canadian Arctic, satellite telemetry reveals how orcas navigated long-distance travel, actively avoiding sea ice. These tracking methods extend research knowledge on migration routes and habitat use, providing long-term data on how these predators move into newly accessible Arctic waters as sea ice declines. In contrast to direct observation, combining historical sighting records and sea-ice data in Hudson Bay illustrates how environmental changes can be used to track orca presence and distribution. Sea ice previously acted as a “barrier”, limiting orca movement into Arctic waters; however, as ice declined, sightings increased exponentially<ref name=":12" />. Climate monitoring allows for predictions on where predator expansion may occur, and understanding ice dynamics helps forecast future ecosystem changes. Technical solutions help scientists better understand when and where orcas enter Arctic ecosystems, while also showing the ecological consequences of increased predation on Arctic marine mammals such as narwhal, beluga, and bowhead whales, which have historically relied on sea ice as a refuge from predators. Increasing awareness and conservation incentives surrounding these issues can help promote the long-term stability of Arctic marine ecosystems.

=== '''Cultural and Social Collaboration''' ===
While modern technological advances provide insight on how predator and prey relationships can be sustainably managed, these methods are relatively new and still developing. For long-term impact, conservation planning should involve collaboration with Indigenous communities in Arctic regions, recognizing their long-standing relationship with local ecosystems and their deep knowledge of sustainable marine stewardship. Integrating Indigenous knowledge systems alongside scientific research ensures effective and respectful approaches to marine conservation. By applying traditional ecological knowledge, Inuit hunters documented orca predation on multiple marine species—including beluga whales, narwhals, bowhead whales, seals, and walruses—offering behavioural observations that are otherwise difficult to obtain through scientific research alone<ref name=":1" />. Furthermore, beyond ecological impacts, orca predation is deeply interlinked with social and cultural implications. Given the cultural and economic importance of marine mammals for subsistence, Inuit hunters have raised concerns about potential declines in their populations<ref name=":1" />. These concerns stem from long-standing community dependence on environmental stability, through which Inuit hunters have developed extensive ecological knowledge and observations that serve as a reliable foundation for sustainable ecosystem management. Integrating traditional ecological knowledge with scientific research can improve environmental monitoring as community observations provide long-term ecological records that complement short-term scientific datasets<ref>Integrating traditional ecological knowledge with scientific research can improve environmental monitoring, as community observations provide long-term ecological records that complement short-term scientific datasets (Proulx et al., 2021).</ref>.

=== '''Policy and Management''' ===
Evidence of shifting orca distribution is measurable through visible scarring on prey species, such as bowhead whales, indicating significant predatory impacts<ref>Willoughby, A. L., Ferguson, M. C., Stimmelmayr, R., Clarke, J. T., & Brower, A. A. (2020). ''Bowhead whale (Balaena mysticetus) and killer whale (Orcinus orca) co-occurrence in the U.S. Pacific Arctic, 2009–2018: Evidence from bowhead whale carcasses''. Polar Biology, 43, 1669–1679.</ref>. The frequency of these occurrences suggests that greater protective measures are necessary to safeguard Arctic marine ecosystems, particularly through Arctic management and conservation policies. Protected areas and conservation policies enable governments to limit additional human pressures that may intensify instability in marine ecosystems and populations. Well-managed marine protected areas have been shown to support significantly higher biomass and species density compared to unprotected regions, demonstrating their role in enhancing ecosystem stability<ref>Edgar, G. J., Stuart-Smith, R. D., Willis, T. J., Kininmonth, S., Baker, S. C., Banks, S., Barrett, N. S., Becerro, M. A., Bernard, A. T. F., Berkhout, J., Buxton, C. D., Campbell, S. J., Cooper, A. T., Davey, M., Edgar, S. C., Försterra, G., Galván, D. E., Irigoyen, A. J., Kushner, D. J., … Thomson, R. J. (2014). Global conservation outcomes depend on marine protected areas with five key features. Nature, 506(7487), 216–220. <nowiki>https://doi.org/10.1038/nature13022</nowiki></ref>. In addition to strengthening ecosystem resilience, these protected areas improve ecological interactions within marine food webs while limiting human stressors such as fishing and habitat disturbance<ref>Halpern, B. S., Lester, S. E., McLeod, K. L., & Gaines, S. D. (2010). Placing marine protected areas onto the ecosystem-based management seascape. ''Proceedings of the National Academy of Sciences of the United States of America'', ''107''(43), 18312–18317. <nowiki>http://www.jstor.org/stable/25748486</nowiki></ref>. Although protected areas cannot directly prevent the climate-driven range expansion of orcas, they can help maintain stable prey populations by reducing additional human pressures, thereby enhancing the resilience of Arctic marine ecosystems facing increasing predation stress.

Addressing the ecological impacts of orca range expansion will require integrated management strategies that account for both environmental and human dimensions.

==Conclusion==
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[[Category:Conservation]]

Course:CONS200/2026WT2/Orcas (Orcinus orca) and climate change in the Arctic: Status and impact

2026-04-12T22:15:30Z

AveryFishman: Finished Edited Avery Sections

Add your introduction here, covering general background information about the topic (e.g. location, duration).

== Background on Orcas & The Arctic ==
=== Arctic Sea Ice Loss ===
Arctic sea ice has declined by ~12.2% per decade since 1979, as a result of the ocean warming caused by climate change<ref>{{Cite web|last=NASA|date=January 15, 2026|title=Arctic Sea Ice Minimum Extent - Earth Indicator|url=https://science.nasa.gov/earth/explore/earth-indicators/arctic-sea-ice-minimum-extent/|url-status=live}}</ref>. Though sea ice losses have remained relatively minimal in the past 20 years, estimates suggest that this slowed loss is only a temporary effect of a natural fluctuation in climate, and that sea ice will eventually resume<ref>{{Cite web|last=Carrington|first=Damian|date=August 20th, 2025|title=Dramatic slowdown in melting of Arctic sea ice surprises scientists|url=https://www.theguardian.com/environment/2025/aug/20/slowdown-in-melting-of-arctic-sea-ice-surprises-scientists|url-status=live|website=The Guardian}}</ref>. Further, once this temporary ice loss ends, expected by 2035 at the latest, there are heightened chances of an accelerated loss of Arctic sea ice<ref>{{Cite journal|last=England|first=M. R.|last2=Polvani|first2=L. M.|last3=Screen|first3=J.|last4=Chan|first4=A. C.|date=August 5th, 2025|title=Minimal Arctic Sea Ice Loss in the Last 20 Years, Consistent With Internal Climate Variability|journal=Geophysical Research Letters|volume=52|doi=10.1029/2025GL116175}}</ref>. This data suggests that the effects of sea ice losses in the Arctic have the potential to significantly worsen, which poses a significant risk to an Arctic that has already experienced significant losses in sea ice over the past 50 years, of over 10,000 km3<ref>{{Cite journal|last=Kwok|first=R.|date=October 12th, 2018|title=Arctic sea ice thickness, volume, and multiyear ice coverage: losses and coupled variability (1958–2018)|journal=Environmental Research Letters|volume=13|pages=105005|doi=10.1088/1748-9326/aae3ec}}</ref>. This decline in ice naturally results in a more open sea, which creates an extended range for orca populations<ref>{{Cite journal|last=Kimber|first=Brynn|last2=Harlacher|first2=Jenna|last3=Braen|first3=Eric|last4=Berchok|first4=Catherine|date=October 1st, 2021|title=Tracking killer whale movements in the Alaskan Arctic relative to a loss of sea ice|journal=The Journal of the Acoustial Society of America|volume=150|issue=4|doi=doi.org/10.1121/10.0008306}}</ref>.

=== History and Status of Orcas ===
[[File:Dorsal fin of a killer whale 03.jpg|alt=Dorsal Fin of a Killer Whale|thumb|Dorsal fin of a Killer Whale found close to the coast.]]The status of orca populations is difficult to quantify, largely because there remains an ongoing debate as to whether transient orcas (often called Brigg’s Killer Whales) and Southern Resident orcas, currently both considered subspecies of orca, should be classified as separate species<ref>{{Cite journal|last=Morin|first=Phillip A.|last2=McCarthy|first2=Morgan L.|last3=Fung|first3=Charissa W.|last4=Durban|first4=John W.|last5=Parsons|first5=Kim M.|last6=Perrin|first6=William F.|last7=Taylor|first7=Barbara L.|last8=Jefferson|first8=Thomas A.|last9=Archer|first9=Freckdrick I.|date=27 March 2024|title=Revised taxonomy of eastern North Pacific killer whales (Orcinus orca): Bigg’s and resident ecotypes deserve species status|journal=Royal Scoiety Open Science|volume=11|issue=3|doi=10.1098/rsos.231368}}</ref>. Transient orcas are currently considered to be thriving, while Southern Resident orcas, in particular, face the largest risks of extinction, primarily due to pollutants accumulated from the fish eaten by residents, disturbance from marine vessels, and the availability of salmon as a food source<ref>{{Cite web|last=NOAA Fisheries|date=September 2nd, 2025|title=Saving the Southern Resident Killer Whales|url=https://www.fisheries.noaa.gov/west-coast/endangered-species-conservation/saving-southern-resident-killer-whales|url-status=live}}</ref>. Mammal-eating Brigg’s Killer Whale populations, meanwhile, have consistently grown for decades, with the population off the coast of British Columbia having more than doubled in size to over 500 individuals since 1990<ref>{{Cite journal|last=Fisheries and Oceans Canada|date=July 2013|title=Information In Support of the Identification of Critical Habitatat for Transient Killer Whales (Orcinus Orca) Off the West Coast of Canada|url=https://waves-vagues.dfo-mpo.gc.ca/Library/349619.pdf|journal=Science Advisory Report}}</ref>. However, Brigg’s Killer Whales still face threats from pollutants and vessel activity, as do residents, with vessel activity potentially impacting Brigg’s ability to hunt<ref>{{Cite journal|last=Jourdain|first=Eve|last2=Goh|first2=Tiffany|last3=Kuningas|first3=Sanna|last4=Simila|first4=Tiu|last5=Vongraven|first5=Dag|last6=Karoliussen|first6=Richard|last7=Bisther|first7=Anna|last8=Hammond|first8=Phillip J|date=November 18th 2021|title=Killer whale (Orcinus orca) population dynamics in response to a period of rapid ecosystem change in the eastern North Atlantic|journal=Ecology and Evolution|volume=11|issue=23|doi=10.1002/ece3.8364Digital Object Identifier (DOI)}}</ref>. Given the relatively reliable growth of Brigg’s transient Killer Whales however, in addition to the extension of the orca’s typical range, there are important implications for other mammal species in the Arctic.
[[File:Bowhead Whale NOAA.jpg|alt=Lone Bowhead Whale in Arctic|left|thumb|Bowhead Whale in the Arctic. Bowhead Whales escape predation by punching holes under Arctic sea ice<ref name=":0">{{Cite journal|last=Huntington|first=Henry P.|date=21 March 2008|title=A preliminary assessment of threats to arctic marine mammals and their conservation in the coming decades|journal=Marine Policy|volume=33|issue=1|doi=10.1016/j.marpol.2008.04.003}}</ref>.]]

=== History and Status of Key Arctic Marine Mammals ===

==== Bowhead Whales ====
One of the few endemic whale species in the Arctic includes the Bowhead Whale, a population which experienced severe declines as a direct result of whaling, from an estimated peak of 50,000 to less than 3,000 by 1921<ref name=":1">{{Cite web|last=NOAA Fisheries|date=Accessed Fedbuary 15th, 2026|title=Bowhead Whale|url=https://www.fisheries.noaa.gov/species/bowhead-whale|url-status=live}}</ref>. After the end of commercial whaling, and the implementation of protections in the 1970s, many populations have since rebounded rapidly, with one subpopulation, the Bering-Chukchi-Beaufort, having rebounded to over 14,000 individuals<ref>{{Cite journal|last=Givens|first=Geof|last2=George|first2=J. Craig|last3=Suydam|first3=Robert|last4=Tudor|first4=Barbara|last5=Von Duyke|first5=Andrew|last6=Person|first6=Brian|date=April 11, 2023|title=Correcting the 2019 survey abundance of Bering-Chukchi-Beaufort Seas bowhead whales for disturbance from powered skiffs|journal=Journal of Cetacean Research and Management|volume=24|doi=10.47536/jcrm.v22i1.362}}</ref>. However, this rebound hasn’t been felt equally by all Bowhead Whale populations. The Okhotsk Sea population, for example, has only a few hundred individuals remaining, and is at heightened risk<ref name=":1" />. A key risk factor for Bowhead Whales is the rising of sea temperatures, and the loss of sea ice, which Bowhead Whales depend on for foraging and protection from predators<ref>{{Cite journal|last=de Greef|first=Evelien|last2=Müller|first2=Claudio|last3=Snead|first3=Anthony A.|last4=Rivkin|first4=Ruth L.|last5=Ferguson|first5=Steven H.|last6=Watt|first6=Cortney A.|last7=Marcoux|first7=Marianne|last8=Petersen|first8=Stephen D.|last9=Garroway|first9=Colin J.|date=March 2026|title=Identifying Areas of Potential Risk Based on Future Genetic Adaptability in Three Arctic Whale Species|journal=The American Naturalist|volume=207|issue=3|doi=10.1086/738889}}</ref>.

==== Narwhals & Beluga Whales ====
Additional notable Arctic marine mammals include Narwhals and Beluga Whales. In the Arctic Ocean, both of these animals rely heavily on the availibility of Arctic sea ice for many facets of their survival, including for foraging and protection from predation<ref name=":2">{{Cite journal|last=Williams|first=Terri M.|last2=Noren|first2=Shawn R.|last3=Glenn|first3=Mike|date=August 26th, 2010|title=Extreme physiological adaptations as predictors of climate-change sensitivity in the narwhal, Monodon monoceros|journal=Marine Mammal Science|volume=27|pages=2|doi=10.1111/j.1748-7692.2010.00408.xDigital Object Identifier (DOI)}}</ref>. Both marine mammals have been documented to use their ability to create or reach air pockets in thick ice to escape Killer Whales<ref name=":2" /><ref name=":4">{{Cite book|title=The World of the Arctic Whales: Belugas, Bowheads, and Narwhals|last=Paine|first=Stefani|publisher=Sierra Club Books|year=1997|isbn=0871569574, 9780871569578}}</ref>. The conservation status of both is similar, with both being considered of least concern on the IUCN Red list<ref>{{Cite web|last=Lowry|first=L.|last2=Reeves|first2=R.|last3=Laidre|first3=K.|date=June 22nd, 2017|title=Delphinapterus leucas. The IUCN Red List of Threatened Species|url=https://www.iucnredlist.org/species/6335/50352346|url-status=live|website=IUCN Red List|doi=10.2305/IUCN.UK.2017-3.RLTS.T6335A50352346.en}}</ref><ref>{{Cite web|last=Lowry|first=L.|last2=Laidre|first2=K.|last3=Reeves|first3=R.|date=July 3rd, 2017|title=Monodon monoceros. The IUCN Red List of Threatened Species|url=https://www.iucnredlist.org/species/13704/50367651|url-status=live|website=IUCN Red List|doi=10.2305/IUCN.UK.2017-3.RLTS.T13704A50367651.en}}</ref>. However, the status of these species varies significantly by population. One particularly threatened sub population in the Cook Inlet of Alaska, for example, has been in decline since the 1990s, having been historically descimated by whaling<ref name=":5">{{Cite journal|last=Shelden|first=Kim E. W.|last2=Rugh|first2=David J.|last3=Mahoney|first3=Barbara A.|last4=Dahlheim|first4=Amarilyn E.|title=Killer Whale Predation On Belugas in Cook Inlet, Alaska: Implications for a Depleted Population|url=https://web.archive.org/web/20121224211121/http://www.fakr.noaa.gov/protectedresources/whales/beluga/MMSKillerwhaleBeluga.pdf|dead-url=http://www.fakr.noaa.gov/protectedresources/whales/beluga/MMSKillerwhaleBeluga.pdf|journal=Marine Mammal Science|volume=19|issue=3}}</ref>.

== Threats to Marine Mammals in the Arctic Today ==

=== Current Threats ===
[[File:Shell Oil's Polar Pioneer Arctic Drilling Rig - West Seattle, Seattle, Washington.jpg|alt=Oil Drilling Rig in a Port|thumb|Polar Pioneer Arctic Drilling Rig, owned by Shell Oil. ]]
Presently, most marine Arctic mammal species are doing reasonably well, with most able to sustain small amounts of sport and subsistence hunting. However, several factors, namely disease, disruption from vessels, offshore oil extraction, direct and indirect fishery impacts, habitat and environmental changes, and algae blooms, threaten the stability of many Arctic species<ref name=":0" />. Nearly all of these factors are caused or exacerbated severely by human activity. One of the most extensive human effects in particular is climate change, which is currently affecting all parts of the Arctic and will continue to, especially through increasingly open water due to ice melting, as well as warmer water<ref>{{Cite news|url=https://www.amap.no/documents/doc/amap-assessment-report-arctic-pollution-issues/68|title=AMAP Assessment Report: Arctic Pollution Issues|last=AMAP|date=1998|isbn=82-7655-061-4}}</ref>. For many Arctic marine mammals, including narwhal, Beluga & Bowhead Whales, and seals, that rely on sea ice, the loss of Arctic sea ice poses a dire threat to their well-being<ref name=":0" />. The risks are heightened by the limited ability of specialized Arctic marine mammals to respond quickly to rapid environmental fluctuations, due to their long lifespans<ref name=":3" />. Further, the loss of sea ice presents an opportunity for outcrowding from marine mammals that typically live in the Arctic seasonally, including Orca and several whale species such as Fin and Humpback<ref name=":3">{{Cite journal|last=Moore|first=Sue P.|last2=Huntington|first2=Henry P.|date=March 1st, 2008|title=Arctic Marine Mammals and Climate Change: Impacts and Resilience|journal=Ecological Applications|volume=18|issue=sp2|doi=10.1890/06-0571.1}}</ref>.

== Impacts of Orca Hunting on Arctic Marine Mammals ==

=== '''Sea Ice in the Context of Killer Whale Hunting''' ===
For many permanent residents of the Arctic, including Bowhead Whales, Narwhals, and Beluga Whales<ref name=":0" /><ref name=":2" /><ref name=":4" /> , sea ice is crucial for evading predators that cannot spend prolonged periods of time underneath the ice. For example, Bowhead Whales are able to make air pockets underneath Arctic ice, which allows them to stay underneath the ice for prolonged periods, whereas Orcas are unable to do the same and would be unable to successfully hunt the Bowhead Whale<ref name=":0" />.

=== '''Increased Hunting Opportunities from Sea Ice Loss''' ===
[[File:Killer Whales Hunting a Seal.jpg|alt=Killer Whales hunting a seal, stranded on a small piece of ice|thumb|Killer Whales hunting a seal. Sea ice provides Arctic marine mammals with escape opportunities from Killer Whales, which are lost as Arctic sea ice melts. ]]Given the protections provided by sea ice, the loss of sea ice in the Arctic in notable in the changes this loss causes, in terms of Orca hunting opportunities. The melting of sea ice has increased the hunting opportunities for mammal-eating Brigg’s Killer Whales, so much so that predation from Killer Whales has become the biggest source of documented Bowhead Whale carcasses<ref>{{Cite journal|last=Willoughby|first=Amy L.|last2=Ferguson|first2=Megan C.|last3=Stimmelmayr|first3=Raphaela|last4=Clarke|first4=Janet T.|last5=Brower|first5=Amelia A.|date=September 10th, 2017|title=Bowhead whale (Balaena mysticetus) and killer whale (Orcinus orca) co-occurrence in the U.S. Pacific Arctic, 2009–2018: evidence from bowhead whale carcasses|journal=Polar Biology|volume=43|doi=10.1007/s00300-020-02734-y.}}</ref>. For Beluga Whales, predation by Killer Whales has become significant as well, with one population in Cook Inlet, Alaska, experiencing increased pressure from Killer Whale predation, despite their presence in the region historically being small<ref name=":5" />. It is for this reason that loss of sea ice is likely to prove beneficial largely for non-resident marine life, particularly orcas, in the Arctic, while permanent resident marine life is facing severe risk<ref name=":3" />. Addressing this issue ultimately requires a massive global-wide effort to curb climate change, as soon as possible. In the interim, to help support threatened marine life, more local effects should be pursued, such as reducing noise disruptions from vessels and curtailing offshore oil and gas drilling. These small-scale solutions can delay the worst effects for local Arctic residents, including endangered populations of Bowhead Whales<ref name=":0" />.
== Current Action ==
=== Protection Status ===
In 2008, the Killer whale population in the Eastern Arctic region was listed as a special concern under the [https://en.wikipedia.org/wiki/Committee_on_the_Status_of_Endangered_Wildlife_in_Canada Committee on the status of Endangered Wildlife in Canada] (COSEWIC)<ref name=":0">{{Cite web|date=2024-10-21|title=Killer Whale (Orcinus orca): COSEWIC assessment and status report 2023|url=https://www.canada.ca/en/environment-climate-change/services/species-risk-public-registry/cosewic-assessments-status-reports/killer-whale-2023.html#toc6|url-status=live}}</ref>. Later in 2023, they were reassessed and found to maintain the special concern status1<ref name=":0" />. The special concern status describes populations that are at risk of becoming endangered or threatened, although not in imminent risk of extirpation<ref>{{Cite web|date=Accessed March 15th, 2026|title=Table 5. COSEWIC status categories|url=https://cosewic.ca/index.php/en/assessment-process/cosewic-assessment-process-categories-and-guidelines/status-categories.html|url-status=live}}</ref>. However, other populations, including the [https://en.wikipedia.org/wiki/Southern_resident_orcas Southern resident orcas] located off the Pacific west coast are considered endangered by COSEWIC<ref name=":0" />.

=== Conservation Strategies ===
[[File:Arctic (orthographic projection).svg|thumb|Map of the Arctic ocean]]
Reproduction for orcas is relatively slow, with generation time being around 29 years for Orcas in the Arctic<ref name=":0" />. Thus, recovery from low population rates is expected to take time, even with protection measures in place. Although progress for the recovery initiative is hard to determine, many conservation projects and policies are being put into place in the Arctic to help ecosystems withstand the impacts of climate change. Due to their non critically endangered status, little protection specific to orcas has been put in place in the Arctic, but rather broad actions to preserve the entire ecosystem.
[[File:Arctic Marine Food Web 2012.png|thumb|Arctic food web]]
With the Arctic ecosystem rapidly changing, strong concerns have emerged for long term food availability for all species, including Orcas<ref name=":4">{{Cite journal|last=Misund|first=Ole|last2=Hop|first2=Haakon|last3=Quillfeldt|first3=Cecile|date=October 1st 2025|title=Area based management in polar oceans for biodiversity conservation and enhanced sustainability of fisheries|url=https://doi.org/10.3389/focsu.2025.1634989|journal=Frontier in Ocean Sustainability|volume=3}}</ref>. As ice melts, marine areas previously restricted become more accessible<ref name=":4" />. This is likely to cause more unregulated overfishing, putting even more pressure on an already vulnerable ecosystem. The Central Arctic Ocean Fisheries Agreement was implemented in 2021 with the goal of minimizing damage to food chains in the Arctic3<ref name=":4" />. The eight countries involved; Canada, the United States, Russia, Finland, Sweden, Denmark, Norway and Iceland, have agreed to ban commercial fishing from the designated Marine Protected area for at least 15 years until resource availability has been assessed and mapped<ref name=":4" />. Prohibiting fishing from designed areas leaves more fish resources for the several endangered species in the Arctic, including [https://en.wikipedia.org/wiki/Bowhead_whale Bowhead whales] and narwhals<ref name=":4" />. This protection measure does not however address the growing concern of food chain disimbalance caused by increased opportunities for orcas to hunt other endangered species as they migrate further into the Arctic.

Much of the world’s oceans are beyond National control. Despite the CAOFA fishing ban, the Arctic remains vulnerable to other exploitative activities such as deep sea mining and shipping routes. In January 2026, the [https://en.wikipedia.org/wiki/High_Seas_Treaty High Seas Treaty], an international agreement was put into place to safeguard the Arctic from harmful industry activities under the [https://en.wikipedia.org/wiki/United_Nations_Convention_on_the_Law_of_the_Sea UN convention of the Law and the Seas]. With this treaty in place, companies planning projects in the ocean will need to carry out environmental assessments prior to taking any action. Furthermore, the treaty creates more opportunities to establish more marine protected areas, one of the most ambitious attempts at safeguarding our oceans from habitat destruction and biodiversity loss<ref>{{Cite journal|date=March 16th 2023|title=How science can fill the gaps of the high seas treaty|url=https://www.nature.com/articles/d41586-023-00757-z.pdf|journal=Nature|volume=Vol. 615|pages=373}}</ref>. Additionally, conservation organization [https://en.wikipedia.org/wiki/World_Wide_Fund_for_Nature WWF] has developed ActNet, a framework with maps and databases to determine priority areas for conservation to complement the treaty. Countries who have signed the agreement are permitted to profit from activities beyond their national borders, however they will be required to pay into a global fund to protect for conservation of the high seas.

==Future Considerations ==
To mitigate the ecological impacts associated with the increasing presence of orcas in Arctic ecosystems, management approaches that incorporate technical, cultural, social, and political perspectives must be addressed.

Describe your analysis and evaluation of additional solutions and recommendations from a technical, social, cultural, economic, financial, political and/or legal points of view (not all of these categories will be relevant to all situations);

==Conclusion==
You should conclude your Wiki paper by summarizing the topic, or some aspect of the topic.[[File:Crepuscular Rays in GGP.jpg|thumbnail|right|Images from [https://commons.wikimedia.org/wiki/Main_Page Wikimedia Commons] can be embedded easily.]]
==References==
Please use the Wikipedia reference style. Provide a citation for every sentence, statement, thought, or bit of data not your own, giving the author, year, AND page.
For dictionary references for English-language terms, I strongly recommend you use the Oxford English Dictionary. You can reference foreign-language sources but please also provide translations into English in the reference list.

'''Note:''' Before writing your wiki article on the UBC Wiki, it may be helpful to review the tips in [https://en.wikipedia.org/wiki/Wikipedia:Writing_better_articles Wikipedia: Writing better articles].

<references/>

{{Projectbox CONS200
|names=
|share=no
}}

[[Category:Conservation]]

Course:CONS200/2026WT2/Orcas (Orcinus orca) and climate change in the Arctic: Status and impact

2026-04-12T21:22:48Z

AveryFishman: Added my section

Add your introduction here, covering general background information about the topic (e.g. location, duration).

Hello!

== Background on Orcas & The Arctic ==
Include the scope/scale of the problem, intensity/frequency/severity of negative impacts, variables influencing those impacts and any other relevant information needed for understanding the issue.

=== Arctic Sea Ice Loss ===
Arctic sea ice has declined by ~12.2% per decade since 1979, as a result of the ocean warming caused by climate change<ref>{{Cite web|last=NASA|date=January 15, 2026|title=Arctic Sea Ice Minimum Extent - Earth Indicator|url=https://science.nasa.gov/earth/explore/earth-indicators/arctic-sea-ice-minimum-extent/|url-status=live}}</ref>. Though sea ice losses have remained relatively minimal in the past 20 years, estimates suggest that this slowed loss is only a temporary effect of a natural fluctuation in climate, and that sea ice will eventually resume<ref>{{Cite web|last=Carrington|first=Damian|date=August 20th, 2025|title=Dramatic slowdown in melting of Arctic sea ice surprises scientists|url=https://www.theguardian.com/environment/2025/aug/20/slowdown-in-melting-of-arctic-sea-ice-surprises-scientists|url-status=live|website=The Guardian}}</ref>. Further, once this temporary ice loss ends, expected by 2035 at the latest, there are heightened chances of an accelerated loss of Arctic sea ice<ref>{{Cite journal|last=England|first=M. R.|last2=Polvani|first2=L. M.|last3=Screen|first3=J.|last4=Chan|first4=A. C.|date=August 5th, 2025|title=Minimal Arctic Sea Ice Loss in the Last 20 Years, Consistent With Internal Climate Variability|journal=Geophysical Research Letters|volume=52|doi=10.1029/2025GL116175}}</ref>. This data suggests that the effects of sea ice losses in the arctic have the potential to significantly worsen, which poses a significant risk to an arctic that has already experienced significant losses in sea ice over the past 50 years, of over 10,000km^3<ref>{{Cite journal|last=Kwok|first=R.|date=October 12th, 2018|title=Arctic sea ice thickness, volume, and multiyear ice coverage: losses and coupled variability (1958–2018)|journal=Environmental Research Letters|volume=13|pages=105005|doi=10.1088/1748-9326/aae3ec}}</ref>. This decline in ice naturally results in a more open sea, which creates an extended range for orca populations<ref>{{Cite journal|last=Kimber|first=Brynn|last2=Harlacher|first2=Jenna|last3=Braen|first3=Eric|last4=Berchok|first4=Catherine|date=October 1st, 2021|title=Tracking killer whale movements in the Alaskan Arctic relative to a loss of sea ice|journal=The Journal of the Acoustial Society of America|volume=150|issue=4|doi=doi.org/10.1121/10.0008306}}</ref>.
[[File:Dorsal fin of a killer whale 03.jpg|alt=Dorsal Fin of a Killer Whale|thumb|Dorsal fin of a Killer Whale found close to the coast.]]

=== History and Status of Orcas ===
The status of orca populations is difficult to quantify, largely because there remains an ongoing debate as to whether transient orcas (often called Brigg’s killer whales) and Southern Resident orcas, currently both considered subspecies of orca, should be classified as separate species<ref>{{Cite journal|last=Morin|first=Phillip A.|last2=McCarthy|first2=Morgan L.|last3=Fung|first3=Charissa W.|last4=Durban|first4=John W.|last5=Parsons|first5=Kim M.|last6=Perrin|first6=William F.|last7=Taylor|first7=Barbara L.|last8=Jefferson|first8=Thomas A.|last9=Archer|first9=Freckdrick I.|date=27 March 2024|title=Revised taxonomy of eastern North Pacific killer whales (Orcinus orca): Bigg’s and resident ecotypes deserve species status|journal=Royal Scoiety Open Science|volume=11|issue=3|doi=10.1098/rsos.231368}}</ref>. Transient orcas are currently considered to be thriving, while Southern Resident orcas, in particular, face the largest risks of extinction, primarily due to pollutants accumulated from the fish eaten by residents, disturbance from marine vessels, and the availability of salmon as a food source<ref>{{Cite web|last=NOAA Fisheries|date=September 2nd, 2025|title=Saving the Southern Resident Killer Whales|url=https://www.fisheries.noaa.gov/west-coast/endangered-species-conservation/saving-southern-resident-killer-whales|url-status=live}}</ref>. Mammal-eating Brigg’s killer whale populations, meanwhile, have consistently grown for decades, with the population of the coast of British Columbia having more than doubled in size to over 500 individuals since 1990<ref>{{Cite journal|last=Fisheries and Oceans Canada|date=July 2013|title=Information In Support of the Identification of Critical Habitatat for Transient Killer Whales (Orcinus Orca) Off the West Coast of Canada|url=https://waves-vagues.dfo-mpo.gc.ca/Library/349619.pdf|journal=Science Advisory Report}}</ref>. However, Brigg’s killer whales still face threats from pollutants and vessel activity, as do residents, with vessel activity potentially impacting Brigg’s ability to hunt<ref>{{Cite journal|last=Jourdain|first=Eve|last2=Goh|first2=Tiffany|last3=Kuningas|first3=Sanna|last4=Simila|first4=Tiu|last5=Vongraven|first5=Dag|last6=Karoliussen|first6=Richard|last7=Bisther|first7=Anna|last8=Hammond|first8=Phillip J|date=November 18th 2021|title=Killer whale (Orcinus orca) population dynamics in response to a period of rapid ecosystem change in the eastern North Atlantic|journal=Ecology and Evolution|volume=11|issue=23|doi=10.1002/ece3.8364Digital Object Identifier (DOI)}}</ref>. Given the relatively reliable growth of Brigg’s transient killer whales however, in addition to the extension of the orca’s typical range, there are important implications for other mammal species in the Arctic.
[[File:Bowhead Whale NOAA.jpg|alt=Lone Bowhead Whale in Arctic|left|thumb|Bowhead Whale in the Arctic. Bowhead Whales escape predation by punching holes under Arctic sea ice<ref name=":0">{{Cite journal|last=Huntington|first=Henry P.|date=21 March 2008|title=A preliminary assessment of threats to arctic marine mammals and their conservation in the coming decades|journal=Marine Policy|volume=33|issue=1|doi=10.1016/j.marpol.2008.04.003}}</ref>.]]

=== History and Status of Key Arctic Marine Mammals ===

==== Bowhead Whales ====
One of the few endemic whale species in the arctic includes the bowhead whale, a population which experienced severe declines as a direct result of whaling, from an estimated peak of 50,000 to less than 3,000 by 1921<ref name=":1">{{Cite web|last=NOAA Fisheries|date=Accessed Fedbuary 15th, 2026|title=Bowhead Whale|url=https://www.fisheries.noaa.gov/species/bowhead-whale|url-status=live}}</ref>. After the end of commercial whaling, and the implementation of protections in the 1970s, many populations have since rebounded rapidly, with one subpopulation, the Bering-Chukchi-Beaufort, having rebounded to over 14,000 individuals<ref>{{Cite journal|last=Givens|first=Geof|last2=George|first2=J. Craig|last3=Suydam|first3=Robert|last4=Tudor|first4=Barbara|last5=Von Duyke|first5=Andrew|last6=Person|first6=Brian|date=April 11, 2023|title=Correcting the 2019 survey abundance of Bering-Chukchi-Beaufort Seas bowhead whales for disturbance from powered skiffs|journal=Journal of Cetacean Research and Management|volume=24|doi=10.47536/jcrm.v22i1.362}}</ref>. However, this rebound hasn’t been felt equally by all Bowhead whale populations. The Okhotsk Sea population, for example, has only a few hundred individuals remaining, and is at heightened risk<ref name=":1" />. A key risk factor for Bowhead whales is the rising of sea temperatures, and the loss of sea ice, which bowhead whales depend on for foraging and protection from predators<ref>{{Cite journal|last=de Greef|first=Evelien|last2=Müller|first2=Claudio|last3=Snead|first3=Anthony A.|last4=Rivkin|first4=Ruth L.|last5=Ferguson|first5=Steven H.|last6=Watt|first6=Cortney A.|last7=Marcoux|first7=Marianne|last8=Petersen|first8=Stephen D.|last9=Garroway|first9=Colin J.|date=March 2026|title=Identifying Areas of Potential Risk Based on Future Genetic Adaptability in Three Arctic Whale Species|journal=The American Naturalist|volume=207|issue=3|doi=10.1086/738889}}</ref>.

==== Narwhals & Beluga Whales ====
Additional notable arctic marine mammals include Narwhals, and Beluga Whales. In the Arctic Ocean, both of these animals rely heavily on the availibility of Arctic sea ice for many facets of their survival, including for foraging and protection from predation<ref name=":2">{{Cite journal|last=Williams|first=Terri M.|last2=Noren|first2=Shawn R.|last3=Glenn|first3=Mike|date=August 26th, 2010|title=Extreme physiological adaptations as predictors of climate-change sensitivity in the narwhal, Monodon monoceros|journal=Marine Mammal Science|volume=27|pages=2|doi=10.1111/j.1748-7692.2010.00408.xDigital Object Identifier (DOI)}}</ref>. Both marine mammals have been documented to use their ability to create or reach air pockets in thick ice to escape killer whales<ref name=":2" /><ref>{{Cite book|title=The World of the Arctic Whales: Belugas, Bowheads, and Narwhals|last=Paine|first=Stefani|publisher=Sierra Club Books|year=1997|isbn=0871569574, 9780871569578}}</ref>. The conservation status of both is similar, with both being considered of least concern on the IUCN Red list(CITE). However, the status of these species varies significantly by population. One sub population in the Cook Inlet of Alaska, for example, has been in delcine since the 1990s, having been historically descimated by whaling.(CITE)

== Threats to Marine Mammals in the Arctic Today ==

=== Current Threats ===
Presently, most marine arctic mammal species are doing reasonably well, with most able to sustain small amounts of sport and subsistence hunting. However, several factors, namely disease, disruption from vessels, offshore oil extraction, direct and indirect fishery impacts, habitat and environmental changes, and algae blooms, threaten the stability of many Arctic species<ref name=":0" />. Nearly all of these factors are caused or exacerbated severely by human activity. One of the most extensive human effects in particular is climate change, which is currently affecting all parts of the Arctic and will continue to, especially through increasingly open water due to ice melting, as well as warmer water<ref>{{Cite news|url=https://www.amap.no/documents/doc/amap-assessment-report-arctic-pollution-issues/68|title=AMAP Assessment Report: Arctic Pollution Issues|last=AMAP|date=1998|isbn=82-7655-061-4}}</ref>. For many Arctic marine mammals, including narwhal, beluga & bowhead whales, and seals, that rely on sea ice, the loss of Arctic sea ice poses a dire threat to their well-being<ref name=":0" />. Further, the loss of sea ice presents an opportunity to marine mammals that live in the Arctic seasonally, including orca and several whale species such as fin and humpback<ref name=":3">{{Cite journal|last=Moore|first=Sue P.|last2=Huntington|first2=Henry P.|date=March 1st, 2008|title=Arctic Marine Mammals and Climate ChangeL Impacts and Resilience|journal=Ecological Applications|volume=18|issue=sp2|doi=10.1890/06-0571.1}}</ref>. The risks are heightened by the limited ability of specialized Arctic marine mammals to respond quickly to rapid environmental fluctuations (CITE).

== Impacts of Orca Hunting on Arctic Marine Mammals ==

=== '''Sea Ice in the Context of Killer Whale Hunting''' ===
With regards to evading predation, for many permanent residents of the Arctic, including Bowhead Whales, Narwhals, and Beluga Whales,(CITECITECITE) sea ice is crucial for evading predators that cannot spend prolonged periods of time underneath the ice. For example, Bowhead whales are able to make air pockets underneath Arctic ice, which allows them to stay underneath the ice for prolonged periods, whereas orcas are unable to do the same and would be unable to successfully hunt the bowhead whale<ref name=":0" />.
[[File:Killer Whales Hunting a Seal.jpg|alt=Killer Whales hunting a seal, stranded on a small piece of ice|thumb|Killer Whales hunting a seal. Sea ice provides Arctic marine mammals with escape opportunities from Killer Whales, which are lost as arctic sea ice melts. ]]

=== '''Increased Hunting Opportunities from Sea Ice Loss''' ===
With regards to evading predation, for many permanent residents of the Arctic, sea ice is crucial for evading predators that cannot spend prolonged periods of time underneath the ice. For example, Bowhead whales are able to make air pockets underneath Arctic ice, which allows them to stay underneath the ice for prolonged periods, whereas orcas are unable to do the same and would be unable to successfully hunt the bowhead whale<ref name=":0" />. The melting of sea ice, however, has increased the hunting opportunities for mammal-eating Brigg’s killer whales, so much so that predation from killer whales has become the biggest source of documented bowhead whale carcasses<ref>{{Cite journal|last=Willoughby|first=Amy L.|last2=Ferguson|first2=Megan C.|last3=Stimmelmayr|first3=Raphaela|last4=Clarke|first4=Janet T.|last5=Brower|first5=Amelia A.|date=September 10th, 2017|title=Bowhead whale (Balaena mysticetus) and killer whale (Orcinus orca) co-occurrence in the U.S. Pacific Arctic, 2009–2018: evidence from bowhead whale carcasses|journal=Polar Biology|volume=43|doi=10.1007/s00300-020-02734-y.}}</ref>. For Beluga Whales, predation by Killer Whales has become significant as well, with one population in Cook Inlet, Alaska,

It is for this reason that loss of sea ice is likely to prove beneficial largely for non-resident marine life, particularly orcas, in the Arctic, while permanent resident marine life is facing severe risk<ref name=":3" />. Addressing this issue ultimately requires a massive global-wide effort to curb climate change, as soon as possible. In the interim, to help support threatened marine life, more local effects should be pursued, such as reducing noise disruptions from vessels and curtailing offshore oil and gas drilling. These small-scale solutions can delay the worst effects for local Arctic residents, including endangered populations of bowhead whales<ref name=":0" />.

== Current Action ==
A description of the solutions or efforts that are currently underway to tackle the issue or problem.

=== Protection Status ===
In 2008, the Killer whale population in the Eastern Arctic region was listed as a special concern under the [https://en.wikipedia.org/wiki/Committee_on_the_Status_of_Endangered_Wildlife_in_Canada Committee on the status of Endangered Wildlife in Canada] (COSEWIC)<ref name=":0">{{Cite web|date=2024-10-21|title=Killer Whale (Orcinus orca): COSEWIC assessment and status report 2023|url=https://www.canada.ca/en/environment-climate-change/services/species-risk-public-registry/cosewic-assessments-status-reports/killer-whale-2023.html#toc6|url-status=live}}</ref>. Later in 2023, they were reassessed and found to maintain the special concern status1<ref name=":0" />. The special concern status describes populations that are at risk of becoming endangered or threatened, although not in imminent risk of extirpation<ref>{{Cite web|date=Accessed March 15th, 2026|title=Table 5. COSEWIC status categories|url=https://cosewic.ca/index.php/en/assessment-process/cosewic-assessment-process-categories-and-guidelines/status-categories.html|url-status=live}}</ref>. However, other populations, including the [https://en.wikipedia.org/wiki/Southern_resident_orcas Southern resident orcas] located off the Pacific west coast are considered endangered by COSEWIC<ref name=":0" />.

=== Conservation Strategy ===
[[File:Arctic (orthographic projection).svg|thumb|Map of the Arctic ocean]]
Reproduction for orcas is relatively slow, with generation time being around 29 years for Orcas in the Arctic<ref name=":0" />. Thus, recovery from low population rates is expected to take time, even with protection measures in place. Although progress for the recovery initiative is hard to determine, many conservation projects and policies are being put into place in the Arctic to help ecosystems withstand the impacts of climate change. Due to their non critically endangered status, little protection specific to orcas has been put in place in the Arctic, but rather broad actions to preserve the entire ecosystem.
[[File:Arctic Marine Food Web 2012.png|thumb|Arctic food web]]
With the Arctic ecosystem rapidly changing, strong concerns have emerged for long term food availability for all species, including Orcas. As ice melts, marine areas previously restricted become more accessible. This is likely to cause more unregulated overfishing, putting even more pressure on an already vulnerable ecosystem. The Central Arctic Ocean Fisheries Agreement was implemented in 2021 with the goal of minimizing damage to food chains in the Arctic3. The eight countries involved; Canada, the United States, Russia, Finland, Sweden, Denmark, Norway and Iceland, have agreed to ban commercial fishing from the designated Marine Protected area for at least 15 years until resource availability has been assessed and mapped3. Prohibiting fishing from designed areas leaves more fish resources for the several endangered species in the Arctic, including [https://en.wikipedia.org/wiki/Bowhead_whale Bowhead whales] and narwhals3. This protection measure does not however address the growing concern of food chain disimbalance caused by increased opportunities for orcas to hunt other endangered species as they migrate further into the Arctic.

Much of the world’s oceans are beyond National control. Despite the CAOFA fishing ban, the Arctic remains vulnerable to other exploitative activities such as deep sea mining and shipping routes. In January 2026, the [https://en.wikipedia.org/wiki/High_Seas_Treaty High Seas Treaty], an international agreement was put into place to safeguard the Arctic from harmful industry activities under the [https://en.wikipedia.org/wiki/United_Nations_Convention_on_the_Law_of_the_Sea UN convention of the Law and the Seas]. With this treaty in place, companies planning projects in the ocean will need to carry out environmental assessments prior to taking any action. Furthermore, the treaty creates more opportunities to establish more marine protected areas, one of the most ambitious attempts at safeguarding our oceans from habitat destruction and biodiversity loss. Additionally, conservation organization [https://en.wikipedia.org/wiki/World_Wide_Fund_for_Nature WWF] has developed ActNet, a framework with maps and databases to determine priority areas for conservation to complement the treaty. Countries who have signed the agreement are permitted to profit from activities beyond their national borders, however they will be required to pay into a global fund to protect for conservation of the high seas.

==Future Considerations ==
To mitigate the ecological impacts associated with the increasing presence of orcas in Arctic ecosystems, management approaches that incorporate technical, cultural, social, and political perspectives must be addressed.

Describe your analysis and evaluation of additional solutions and recommendations from a technical, social, cultural, economic, financial, political and/or legal points of view (not all of these categories will be relevant to all situations);

==Conclusion==
You should conclude your Wiki paper by summarizing the topic, or some aspect of the topic.[[File:Crepuscular Rays in GGP.jpg|thumbnail|right|Images from [https://commons.wikimedia.org/wiki/Main_Page Wikimedia Commons] can be embedded easily.]]
==References==
Please use the Wikipedia reference style. Provide a citation for every sentence, statement, thought, or bit of data not your own, giving the author, year, AND page.
For dictionary references for English-language terms, I strongly recommend you use the Oxford English Dictionary. You can reference foreign-language sources but please also provide translations into English in the reference list.

'''Note:''' Before writing your wiki article on the UBC Wiki, it may be helpful to review the tips in [https://en.wikipedia.org/wiki/Wikipedia:Writing_better_articles Wikipedia: Writing better articles].

<references/>

{{Projectbox CONS200
|names=
|share=no
}}

[[Category:Conservation]]

Course:CONS200/Projects

2026-02-13T22:05:52Z

AveryFishman: /* Project Table */

{{Start tab|
| tab-1 = Guidelines
| link-1 = Course:CONS200
| tab-3 = 2026
| link-3 = Course:CONS200/Projects
| tab-4 = Past Projects
| link-4 = Course:CONS200/Samples
| tab-5 = Help and Resources
| link-5 = Course:CONS200/Help and Resources
}}

==Create Your Wiki Page==
===1. Login to the UBC Wiki===
Click the CWL button on the top of the page and login from there.

===2. Find your Project page===
Find your project page from the table below. If you don't see your project, create the wiki page using the box below:

<inputbox>
useve=yes
placeholder=project title here
preload=Course:CONS200/Sample Assignment Page
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===3. Begin Writing! ===
Click the "Edit" button to start editing your wiki page! Your new wiki page will be created with some suggested headings and sections.
==Project Table==

After you have created your project page, please add your information to the project below. You can edit the table by double clicking on the table.
{| class="wikitable"
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!Group
!Project Title
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|Test
|[[Course:CONS200/2026WT2/Rie's test project 2|Rie's project]]
|-
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|[[Course:CONS200/2026WT2/Grassland Ecosystem Conservation and Indigenous Stewardship in the BC Interior]]
|-
|Group 15
|[[Course:CONS200/2026WT2/Orcas (Orcinus orca) and climate change in the Arctic: Status and impact|Orcas (Orcinus orca) and climate change in the Arctic: Status and impact]]
|-
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==Project Template==
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[[Course:CONS200/Sample Assignment Page|Project Template]]

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Course:CONS200/2026WT2/Orcas (Orcinus orca) and climate change in the Arctic: Status and impact

2026-02-13T21:55:28Z

AveryFishman: Created page with " Add your introduction here<ref>Sample Reference</ref>, covering general background information about the topic (e.g. location, duration). Hello! Include the scope/scale of the problem, intensity/frequency/severity of negative impacts, variables influencing those impacts and any other relevant information needed for understanding the issue. ==Heading #2== A description of the solutions or efforts that are currently underway to tackle the issue or problem. ==Head..."

Add your introduction here<ref>Sample Reference</ref>, covering general background information about the topic (e.g. location, duration).

Hello!

Include the scope/scale of the problem, intensity/frequency/severity of negative impacts, variables influencing those impacts and any other relevant information needed for understanding the issue.

==Heading #2==
A description of the solutions or efforts that are currently underway to tackle the issue or problem.

==Heading #3 ==
Describe your analysis and evaluation of additional solutions and recommendations from a technical, social, cultural, economic, financial, political and/or legal points of view (not all of these categories will be relevant to all situations);

==Conclusion==
You should conclude your Wiki paper by summarizing the topic, or some aspect of the topic.[[File:Crepuscular Rays in GGP.jpg|thumbnail|right|Images from [https://commons.wikimedia.org/wiki/Main_Page Wikimedia Commons] can be embedded easily.]]
==References==
Please use the Wikipedia reference style. Provide a citation for every sentence, statement, thought, or bit of data not your own, giving the author, year, AND page.
For dictionary references for English-language terms, I strongly recommend you use the Oxford English Dictionary. You can reference foreign-language sources but please also provide translations into English in the reference list.

'''Note:''' Before writing your wiki article on the UBC Wiki, it may be helpful to review the tips in [https://en.wikipedia.org/wiki/Wikipedia:Writing_better_articles Wikipedia: Writing better articles].<ref>En.wikipedia.org. (2018). Writing better articles. [online] Available at: https://en.wikipedia.org/wiki/Wikipedia:Writing_better_articles [Accessed 18 Jan. 2018].</ref>

<references/>

{{Projectbox CONS200
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|share=no
}}

[[Category:Conservation]]