Patterns in artisanal coral reef fisheries reveal best practices for monitoring and management

Delaney, David; Teneva, Lida; Stamoulis, Kostantinos A.; Giddens, Jonatha; Koike, Haruko; Ogawa, Tom; Friedlander, Alan M.; Kittinger, John N.

doi:10.7287/peerj.preprints.3076

Cited by 5 publications

(11 citation statements)

References 4 publications

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“…Geologically younger and located in the rain shadows of Mauna Loa and Mauna Kea mountains, Ka‘ūpūlehu is very dry and minimally eroded, resulting in poorly developed ephemeral stream channels and large SGD [ 55 , 60 ]. At Hā‘ena, fishing pressure was relatively lower than Ka‘ūpūlehu prior to the establishment of the marine closures ( Fig 1C ) [ 65 ].…”

Section: Methodsmentioning

confidence: 99%

A linked land-sea modeling framework to inform ridge-to-reef management in high oceanic islands

et al. 2018

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Declining natural resources have led to a cultural renaissance across the Pacific that seeks to revive customary ridge-to-reef management approaches to protect freshwater and restore abundant coral reef fisheries. Effective ridge-to-reef management requires improved understanding of land-sea linkages and decision-support tools to simultaneously evaluate the effects of terrestrial and marine drivers on coral reefs, mediated by anthropogenic activities. Although a few applications have linked the effects of land cover to coral reefs, these are too coarse in resolution to inform watershed-scale management for Pacific Islands. To address this gap, we developed a novel linked land-sea modeling framework based on local data, which coupled groundwater and coral reef models at fine spatial resolution, to determine the effects of terrestrial drivers (groundwater and nutrients), mediated by human activities (land cover/use), and marine drivers (waves, geography, and habitat) on coral reefs. We applied this framework in two ‘ridge-to-reef’ systems (Hā‘ena and Ka‘ūpūlehu) subject to different natural disturbance regimes, located in the Hawaiian Archipelago. Our results indicated that coral reefs in Ka‘ūpūlehu are coral-dominated with many grazers and scrapers due to low rainfall and wave power. While coral reefs in Hā‘ena are dominated by crustose coralline algae with many grazers and less scrapers due to high rainfall and wave power. In general, Ka‘ūpūlehu is more vulnerable to land-based nutrients and coral bleaching than Hā‘ena due to high coral cover and limited dilution and mixing from low rainfall and wave power. However, the shallow and wave sheltered back-reef areas of Hā‘ena, which support high coral cover and act as nursery habitat for fishes, are also vulnerable to land-based nutrients and coral bleaching. Anthropogenic sources of nutrients located upstream from these vulnerable areas are relevant locations for nutrient mitigation, such as cesspool upgrades. In this study, we located coral reefs vulnerable to land-based nutrients and linked them to priority areas to manage sources of human-derived nutrients, thereby demonstrating how this framework can inform place-based ridge-to-reef management.

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Section: Methodsmentioning

confidence: 99%

A linked land-sea modeling framework to inform ridge-to-reef management in high oceanic islands

et al. 2018

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“…Total shore fishing effort values were obtained from Delaney et al. () and compared to derived spear fishing effort maps based on the sum of grid cell values within polygons representing each survey area. Empirical boat based fishing effort estimates were not available for comparison.…”

Section: Methodsmentioning

confidence: 99%

Seascape models reveal places to focus coastal fisheries management

Stamoulis

Delevaux

Williams

et al. 2018

Ecological Applications

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To design effective marine reserves and support fisheries, more information on fishing patterns and impacts for targeted species is needed, as well as better understanding of their key habitats. However, fishing impacts vary geographically and are difficult to disentangle from other factors that influence targeted fish distributions. We developed a set of fishing effort and habitat layers at high resolution and employed machine learning techniques to create regional-scale seascape models and predictive maps of biomass and body length of targeted reef fishes for the main Hawaiian Islands. Spatial patterns of fishing effort were shown to be highly variable and seascape models indicated a low threshold beyond which targeted fish assemblages were severely impacted. Topographic complexity, exposure, depth, and wave power were identified as key habitat variables that influenced targeted fish distributions and defined productive habitats for reef fisheries. High targeted reef fish biomass and body length were found in areas not easily accessed by humans, while model predictions when fishing effort was set to zero showed these high values to be more widely dispersed among suitable habitats. By comparing current targeted fish distributions with those predicted when fishing effort was removed, areas with high recovery potential on each island were revealed, with average biomass recovery of 517% and mean body length increases of 59% on Oahu, the most heavily fished island. Spatial protection of these areas would aid recovery of nearshore coral reef fisheries.

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“…B, C; Halpern , Delaney et al. ). However, the Makua refuge is strategically located in a prime nursery habitat (Goodell et al.…”

Section: Discussionmentioning

confidence: 99%

“…At Hā‘ena, fishing pressure was relatively lower than Ka‘ūpūlehu prior to the establishment of the marine closures (Delaney et al. ; Table ).…”

Section: Methodsmentioning

confidence: 99%

“…We calculated and mapped the catch levels (g/m 2 ) per grid cell for three shore‐based fishing gear types (i.e., net, line, and spear fishing) by multiplying the CPUE estimates (kg/h) from locally available creel surveys (Vaughan and Vitousek , Delaney et al. ; Table ), with a high resolution fishing effort map (100 m 2 ) spanning the Main Hawaiian Islands, expressed in (h/ha; see Stamoulis et al. 2018 for more details).…”

Section: Methodsmentioning

confidence: 99%

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Place‐based management can reduce human impacts on coral reefs in a changing climate

Delevaux

Stamoulis

Whittier

et al. 2019

Ecological Applications

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Declining natural resources have contributed to a cultural renaissance across the Pacific that seeks to revive customary ridge‐to‐reef management approaches to protect freshwater and restore abundant coral reef fisheries. We applied a linked land–sea modeling framework based on remote sensing and empirical data, which couples groundwater nutrient export and coral reef models at fine spatial resolution. This spatially explicit (60 × 60 m) framework simultaneously tracks changes in multiple benthic and fish indicators as a function of community‐led marine closures, land‐use and climate change scenarios. We applied this framework in Hā‘ena and Ka‘ūpūlehu, located at opposite ends of the Hawaiian Archipelago to investigate the effects of coastal development and marine closures on coral reefs in the face of climate change. Our results indicated that projected coastal development and bleaching can result in a significant decrease in benthic habitat quality and community‐led marine closures can result in a significant increase in fish biomass. In general, Ka‘ūpūlehu is more vulnerable to land‐based nutrients and coral bleaching than Hā‘ena due to high coral cover and limited dilution and mixing from low rainfall and wave power, except for the shallow and wave‐sheltered back‐reef areas of Hā‘ena, which support high coral cover and act as nursery habitat for fishes. By coupling spatially explicit land–sea models with scenario planning, we identified priority areas on land where upgrading cesspools can reduce human impacts on coral reefs in the face of projected climate change impacts.

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Patterns in artisanal coral reef fisheries reveal best practices for monitoring and management

Cited by 5 publications

References 4 publications

A linked land-sea modeling framework to inform ridge-to-reef management in high oceanic islands

A linked land-sea modeling framework to inform ridge-to-reef management in high oceanic islands

Seascape models reveal places to focus coastal fisheries management

Place‐based management can reduce human impacts on coral reefs in a changing climate

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