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Course:CONS200/2026WT2/Marine and Reef Conservation in the Hawaiian Islands

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Introduction

Endemic reef fish in the Papahānaumokuākea Marine National Monument.

The Hawaiian islands contain some of the most ecologically diverse and culturally significant marine and coral reef ecosystems in the Pacific, spanning over 2,400 km[1]. They support high biodiversity, productive fisheries, and long-standing Indigenous stewardship practices [2][3]. Due to Hawai'i's geographic isolation, many reef species are endemic, with approximately 25% found nowhere else in the world[4]. The reefs and coastal ecosystems across the main and Northwestern islands face numerous disturbances, including climate change leading to coral bleaching[5], ocean acidification, substantial coastal development, overfishing, land-based pollution, and extensive tourism [6][7] Recent research efforts provide evidence of severe coral bleaching associated with unprecedented marine heatwaves, including within protected areas such as the Papahānaumokuākea Marine National Monument, highlighting the limits of protection in the face of global climate change [5]. Conservation responses in Hawai'i include marine protected areas, fisheries regulations, and place-based management strategies that incorporate mauka-to-makai (ridge-to-reef) connectivity [8][9]. Increasingly, conservation efforts emphasize community participation and Indigenous leadership as essential components of effective and socially just marine management [4][3]. Many conservation initiatives combine Western scientific approaches with Indigenous resource management systems rooted in Ahupua’a and Kapu traditions[4]. Together, these approaches position Hawai'i as a critical case study for integrated marine and reef conservation in the Pacific Islands.

Cultural Leadership and Stewardship Practices

Native Hawaiian Man spear fishing, Hana, Maui, 1890.

In the Hawaiian Islands, cultural leadership systems fundamentally shaped coral reef health through long-standing, place-based management practices. Central to this was the Ahupua‘a system, a land-and-sea management approach that organized resource use from mountain to ocean and relied on the natural flow of water and nutrients to sustain both terrestrial and marine ecosystems[10]. This system reflected a deep understanding of ecological balance, where resources were carefully managed to maintain long-term abundance. Stewardship was reinforced through Kapu restrictions that limited harvesting during vulnerable periods, including seasonal fishing prohibitions[11], thereby preventing overexploitation and supporting the regeneration of marine populations. These practices were highly effective, as traditionally managed Hawaiian fisheries have been shown to exhibit biomass levels equal to or greater than those of some no-take marine protected areas[12]. Polynesian settlers further enhanced reef productivity through advanced aquaculture methods, such as fishponds and fish traps, which worked in harmony with natural processes. Together, these integrated systems contributed to documented periods of reef recovery, particularly between 1400 and 1820 AD[13], and supported highly connected ecosystems such as the Olowalu reef in Maui[14], which functioned as a mother reef, replenishing surrounding reefs. Many contemporary conservation efforts in Hawai‘i continue to reflect these principles by emphasizing a holistic ridge-to-reef approach that considers the entire ecosystem.[11].

Historical Significance of the Hawaiian Ecosystem

Coral reefs in the Hawaiian Islands were essential to both the physical survival and cultural identity of Native Hawaiian communities. Hosting over 85% of U.S[15]. coral reefs and numerous endemic species, these ecosystems provided food, protection from coastal erosion and storms, and materials for tools, medicine, and the construction of heiau (sacred temples)[13]. Beyond their material value, reefs held deep spiritual significance; the coral polyp (ko‘a) was regarded as the oldest ancestor and a creator of the islands, establishing a strong sense of mana and kinship between people and the ocean. This relationship fostered a worldview centered on reciprocity and responsibility, where caring for the environment was inseparable from sustaining community life and cultural continuity[16].

Problems Facing Marine Life in Hawai'i

Pollution

Coral bleaching in Hawaiian reefs

Pollution from urban development, agriculture, and wastewater poses significant threats to the marine ecosystems in the Hawaiian Islands. Alteration of water quality and disruption of the natural functions of marine ecosystems are due to the runoff of sediments, nutrients, and chemical contaminants into nearshore waters.[6][7]Increased sediment levels reduce water quality, smother coral colonies, and limit the availability of symbiotic zooxanthellae, thereby reducing coral growth and calcification rates.[2][7] Nutrient-enriched water from fertilizers and wastewater drainage further degrades ecosystems by promoting algae proliferation that competes with reef-building corals for space and resources.[4]

Climate Change and Coral Bleaching

Coral reef ecosystems in the Hawaiian Islands are increasingly threatened by climate change and ocean acidification,[17] both of which disrupt the delicate balance required for reef survival. Rising sea surface temperatures intensify marine heatwaves and have led to widespread coral bleaching events, where thermal stress causes corals to expel their symbiotic zooxanthellae,[18] [19]removing their primary energy source and often resulting in reduced growth or mortality. Recent large-scale bleaching events[5] in regions such as Papahānaumokuākea highlight the growing severity and frequency of these disturbances. In addition to warming, ocean acidification reduces the availability of carbonate ions needed for coral skeleton formation, weakening reef structures[20] over time and limiting recovery. These climate-driven stressors are often compounded by local pressures such as pollution and sedimentation,[7] further accelerating reef degradation and reducing ecosystem resilience. As a result, the long-term stability of Hawaiian coral reefs depends on both global climate action and localized management strategies that enhance reef resilience.[21]

Tourism

Ciliaris tour boat and excesses amounts of snorkerlers in Molokini, Maui

Tourism is one of Hawaii’s largest economic drivers, with approximately 8.5 million visitors each year. [10]Of these, visitors are mostly concentrated on four of the eight main islands[14], creating an economic incentive to engage in unsustainable practices on these reefs. It has been shown that highly visited reefs face a double threat of elevated pollution (in particular, contaminants from sunscreen) and increased coastal infrastructure development.[22] Tourism poses a significant challenge to reef conservation, creating a feedback loop between conservation and tourism in Hawai’i. As conservation efforts increase and the beauty of natural reefs is shared on social media platforms, more people visit these reefs, which in turn harms them further.[22]

There are currently several systems in place to restrict visitor numbers to these areas, such as the Ocean Stewardship User Fee[23], as well as visitor caps and reservation systems[20] at many marine areas frequented by tourists. Many parks and marine areas have programs in place to educate visitors on sustainable practices to avoid damaging the reefs.[20] These programs are not yet fully effective, as there is still a significant economic incentive to promote tourism in the area.

Fishing

Overfishing threats to coral reefs

Overfishing is one of the leading causes of biodiversity loss across the globe, and the islands of Hawai’i are not exempt from this. Currently, at least 11 species of fish are being overfished,[22] and this is primarily around the main island population centres. The species primarily impacted by this overfishing are sharks, groupers, snappers, and mollusks, which are considered high-value by fishermen[23]. The reduction of these populations has cascading effects on the food web of the entire marine ecosystem, creating a negative feedback loop that harms all who rely on it. Overfishing not only harms local fish populations but also harms Hawaii's economy, putting a resource that is heavily relied on by local communities at risk.

The Department of Land and Natural Resources currently has harvesting regulations in place, such as bag limits and minimum harvest sizes.[20] Due to compounding effects from other factors affecting these populations, regulations are difficult to implement and must frequently be revised to sustainably manage this resource.[24]

Importance of Conservation in the Hawaiian Islands

Bleached coral unable to support life

Supporting over 7,000 species of plants and animals[24], the waters of the Hawaiian archipelago are rich in biodiversity and plays a crucial role in the economy and the ecological stability of this ecosystem. A major coastal zone whose anthropogenic alteration is causing decline in biodiversity is the shoreline environment.[19] Over time, many of Hawaii’s have been altered by coastal development, seawall construction and the pollution from coastal developments. This has led to accelerated erosion and ocean acidification [17]. Ocean acidification weakens corals, leading to habitat loss. This causes significant issues to the animal species that rely on the reefs for habitat. In order to prevent further and potentially irreversible loss of biodiversity, these ecosystems must be restored and protected.

Coral reefs support and provide habitat for approximately 25% of all marine life within Earth’s oceans [18]. Higher live reef cover directly leads to more individuals visiting them which increases fish abundance and supports one of Hawaii’s largest economic drivers [25]. In order to prevent further and potentially irreversible loss of biodiversity, these ecosystems must be restored and protected.

Current State of Marine Conservation in the Hawaiian Islands

Marine Protected Areas (MPAs) and Marine Managed Areas (MMAs)

Marine Protected Areas (MPAs) and Marine Managed Areas (MMAs)[5] are important tools used to conserve marine ecosystems in Hawaii. Coral reef resilience as well as reduction in fish populations are heavily impacted by human activities such as overfishing, coastal development and tourism[26]. MPAs are designated areas where human activities such as fishing and resource extraction are restricted in order to protect marine habitats and biodiversity. MPAs are a primary strategy used in Hawai'i for over 40 years and are currently managed by the Division of Aquatic Resources (DAR), often in collaboration with local communities.[4] They have found that MPAs with stronger protection levels have higher fish biomass and biodiversity compared to areas with weaker regulations[4]. However, some MPAs fail to consider the full life cycle of reef fish as they develop. Many species undergo ontogenetic habitat shifts and move through different habitats as they grow. Thus, MPAs are most effective when they protect multiple connected habitats that support different life stages of fish. Habitat connectivity should be considered when MPAs are designed[27].

Efforts to Encourage Local Conservation

Public participation and engagement are critical for the success of marine conservation in Hawaii. Currently, locals' willingness to participate in conservation practices shows a pattern of those who interact regularly with the ocean tending to have stronger pro-conservation attitudes and more support for marine protection policies[16]. Demographic factors such as those belonging to native pacific islander identity, as well as elders showed greater interest and support in implementing conservation practices and for preserving traditional practices related to ocean management[5]. People more involved in cultural ocean practices like fishing and collecting limu have a stronger belief that preserving Hawaiian cultural practices is important for marine conservation. More specifically, research-related ocean users are more likely to engage in conservation activities compared to recreational users who are less likely to view environmental issues as urgent priorities[16].

How Are Marine and Reefs Conserved in the Area

Alongside public participation, land use management have been linked to the degradation of coral reefs. Coastal construction and land disturbance have caused sediment runoff which severely impacts the health of coral reefs [7]. Specifically there has been a major decline in coral cover, and with it a reduction in coral species that have previously dominated the area. These coral species have instead been replaced with more resistant species like algae, which led to increased degradation in the coral reefs and their biodiversity among species.

Future of Conservation in the Islands

Many coastal ecosystem conservation practices focus on the marine area solely, but this can be insufficient if land-based stressors are not addressed simultaneously. The vitality of coral reef ecosystems has been proven to be degraded by sediment runoff, nutrient pollution, and altered freshwater flows from agriculture and urban development[28]. Conservation approaches should be focused on integrating both land and freshwater management in order to effectively protect marine ecosystems.

Watershed-scale planning is an approach that helps to support this integration. This approach focuses on spatial and ecological data frameworks which focus on hydrological boundaries instead of political ones. Watershed planning and prioritization recognizes the interconnectedness of nature by addressing upland areas, streams, estuaries, and coral reefs. Effective conservation therefore requires planning across entire watersheds, rather than managing ecosystems in isolation[9]. Watershed-scale planning can improve the overall function and health of ecosystems by targeting sources of degradation at their origin and identifying priority areas.

Watershed management can also enhance resilience of coral reef ecosystems to climate change by reducing local stressors. Healthier reefs are more resilient to climate change, thus local management is crucial to ensure reefs can adapt and increase resilience to global stressors.[2] Managing reefs alone has been proven to be insufficient and adapting a watershed data plan can increase the ecosystem's ability to resist disturbance and recover after stress[21]. Integrated watershed-to-reef management that incorporates adaptive, data-driven decision-making can strengthen ecosystem resilience by addressing both land-based and climate-related stressors simultaneously.

Along with cross-ecosystem conservation planning, supporting Indigenous leadership and community-based stewardship will play a key role in the future of conservation in the Hawaiian Islands. Programs such as Kūʻula aim to empower Native Hawaiian leaders by integrating traditional ecological knowledge with modern conservation science, strengthening culturally grounded approaches to marine resource management[29].

Conclusion

Hawai‘i is home to a vast array of endemic species found nowhere else on Earth, making conservation essential for maintaining its exceptional biodiversity. However, marine and reef ecosystems face increasing threats from pollution, climate change, over-tourism, and overfishing, all of which have contributed to noticeable ecological decline. Historically, Native Hawaiian communities addressed resource use through sustainable land and sea management practices, including fishing restrictions and aquaculture systems that harmonized with natural processes. While modern approaches such as Marine Protected Areas and Marine Managed Areas have helped mitigate some of these impacts, they are not sufficient on their own.

Effective conservation in the Hawaiian Islands requires a more integrated and adaptive approach that combines ecological science with Indigenous knowledge systems and community-based stewardship. Strengthening local involvement ensures that conservation strategies are both culturally grounded and more widely supported. Expanding ridge-to-reef management is particularly important, as it addresses the interconnectedness of watershed and marine ecosystems while improving reef resilience to climate change. Ultimately, the long-term success of conservation in Hawai‘i will depend on the ability to move beyond fragmented approaches and adopt holistic strategies that balance environmental protection with social and cultural sustainability.

References

  1. ↑ "How did the Hawaiian Islands form?". National Ocean Service. 2024. |first= missing |last= (help)
  2. ↑ 2.0 2.1 2.2 Jokiel, P., L (2008). "Biology and Ecological Functioning of Coral Reefs in the Main Hawaiian Islands".
  3. ↑ 3.0 3.1 Takabayashi, M (2022). "Kū'ula: Nurturing a Generation of Indigenous Leadership for Marine Conservation in Hawai'i". Proquest. 38: 357-364.
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 Friedlander, Alan M. (April, 2002). "Contrasts in density, size, and biomass of reef fishes between the northwestern and the main Hawaiian islands: the effects of fishing down apex predators" (PDF). Marine Ecology Progress Series. 230: 253–264. Check date values in: |date= (help)
  5. ↑ 5.0 5.1 5.2 5.3 5.4 Couch, C., S.; et.,, al (September, 2017). "Mass coral bleaching due to unprecedented marine heatwave in Papahānaumokuākea Marine National Monument (Northwestern Hawaiian Islands)". PLoS One. Check date values in: |date= (help)CS1 maint: extra punctuation (link)
  6. ↑ 6.0 6.1 Foo, S. A; et, al (January, 2021). "Impacts of pollution, fishing pressure, and reef rugosity on resource fish biomass in West Hawaii". Ecological Applications. 31: 1–15. Check date values in: |date= (help)
  7. ↑ 7.0 7.1 7.2 7.3 7.4 Stender, Y; Jokiel, P, L; Rodgers, K, S (March, 2014). "thirty years of coral reef change in relation to coastal construction and increased sedimentation at Pelekane Bay, Hawaiʻi". PeerJ. Check date values in: |date= (help)
  8. ↑ Nadon, M, O; et, al (2015). "Length-based assessment of coral reef fish populations in the main and Northwestern Hawaiian Islands". PLoS One.
  9. ↑ 9.0 9.1 Wilmont, E; Wong, J; Tsang, Y; Lynch, A, J; Infante, O; et, al (2022). "Characterizing mauka-to-makai connections for aquatic ecosystem conservation on Maui, Hawaiʻi. Ecological Informatics". Science Direct.
  10. ↑ 10.0 10.1 "How Many Tourists is Too Many?".
  11. ↑ 11.0 11.1 Singh, Ava (2026). "Traditional Hawaiian Marine Management: The Foundation of Modern Protection".
  12. ↑ Beldade, R; Mills, S, C; Claudet, J; Cote, I, M (2015). "More coral, moe fish? Contrasting snapshots from a remote Pacific atoll". PeerJ.
  13. ↑ 13.0 13.1 Kirch, P, V (2011). "When did the Polynesian settle Hawai'i? A review of 150 years of scholarly inquiry and a tentative answer". Journal of Archaelogical Science. 38: 1807–1817.
  14. ↑ 14.0 14.1 "Coral Reef Degradation in Hawaii: Is Overtourism to Blame?".
  15. ↑ Plaisance, L; Caley, M, J; Brainard, R, E; Knowlton, N (2011). "The diversity of coral reefs: What are we missing?". PLOS ONE.
  16. ↑ 16.0 16.1 16.2 Weiner, C. S (2016). "Ocean use in Hawaii as a predictor of marine Conservation interests, beliefs, and willingness to participate: An exploratory study". Journal of Environmental Studies and Sciences,. 6: 712–723.CS1 maint: extra punctuation (link)
  17. ↑ 17.0 17.1 Fisheries, NOAA (2025). [Noaa.gov "Understanding Ocean Acidification"] Check |url= value (help). National Oceanic and Atmospheric Administration.
  18. ↑ 18.0 18.1 "Coral Bleaching". National Oceanic and Atmospheric Administration. 2015.
  19. ↑ 19.0 19.1 Office of Planning and Sustainable Development (2023, January 20). "Regional Shoreline Management." ArcGIS StoryMaps, Esri. https://storymaps.arcgis.com/stories/e76bd1de3cfb45ccbc7f1eaab196cdeb
  20. ↑ 20.0 20.1 20.2 20.3 Hawaiʻi Department of Land and Natural Resources, Division of Aquatic Resources (2024, February 22). "Hawaiʻi Administrative Rules, Chapter 13-95: Aquatic Life, Fish, and Wildlife" (PDF). Hawaiʻi Department of Land and Natural Resources. Check date values in: |date= (help)
  21. ↑ 21.0 21.1 Gibbs, D. A.; West, J. M.; Bradley, P. (2021). "Incorporating adaptation and resilience into an integrated watershed and coral reef management plan". PLOS ONE.
  22. ↑ 22.0 22.1 22.2 Nadon, Marc (2017). "Stock assessment of the coral reef fishes of Hawaii, 2016". NOAA technical memorandum NMFS-PIFSC ; 60.
  23. ↑ 23.0 23.1 J, H; Mortensen, P.B.; Furevic, D.M. (2002). "The Deep-Water Coral Lophelia Pertusa in Norwegian Waters: Distribution and Fishery Impacts". Fishery Impacts. Hydrobiologia. 417: 1–12. |first= missing |last= (help)
  24. ↑ 24.0 24.1 Eldredge LG, Evenhuis NL, Hawaii Biological Survey. Hawaii’s Biodiversity : A Detailed Assessment of the Numbers of Species in the Hawaiian Islands. Bishop Museum Press; 2003.
  25. ↑ Lin, B; Asner, G.P; et, al (2023). "Coral reefs and coastal tourism in Hawaii". Nat Sustain 6, 254–258.
  26. ↑ "Hawaiian Marine Protected Areas (MPAs) and human impacts".
  27. ↑ Ortiz, D. M.; Tissot, B. N. (2012). "Evaluating ontogenetic patterns of habitat use by reef fish in relation to the effectiveness of marine protected areas in West Hawaii". Journal of Experimental Marine Biology and Ecology. 432-433: 83–93. line feed character in |title= at position 73 (help)
  28. ↑ Wilmot, E; Wong, J.; Lynch, A. J.; Infante, D.; Oleson, K.; Trauch, A.; Clilverd, H. (2022). "Characterizing mauka-to-makai connections for aquatic ecosystem conservation on Maui, Hawaiʻi". Ecological Informatics. 70: 101704.
  29. ↑ Takabayashi, M.; Andrade, P.; Pai, M. (2022). "Kū'ula: Nurturing a Generation of Indigenous Leadership for Marine Conservation in Hawai'i". Parks Stewardship Forum. 38(2): 357–364.


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