Incorporating temperature-dependent fish bioenergetics into a Narragansett Bay food web model

Heinichen, Margaret; McManus, M. Conor; Lucey, Sean M.; Aydin, Kerim; Humphries, Austin T.; Collie, Jeremy S.

doi:10.1016/j.ecolmodel.2022.109911

Cited by 3 publications

(1 citation statement)

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“…For example, the nutrients that are added to the system each month could be based on rainfall, which is expected to change due to climate change (Keener et al, 2012). The maximum rate of fish consumption could also be made to be temperature-dependent, to represent increased metabolism in warmer waters (Heinichen et al, 2022).…”

Section: Limitations and Future Directionsmentioning

confidence: 99%

Restoration of an Indigenous aquaculture system can increase reef fish density and fisheries harvest in Hawai‘i

Innes‐Gold,

Madin,

Stokes

et al. 2024

Ecosphere

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While aquaculture is increasingly considered a globally important source of protein, growing fish for human consumption is not new. Indigenous aquaculture systems, such as loko i‘a (fishponds), were successfully implemented in ancient Hawai‘i and represent a technological advancement designed to sustain a growing human population while maintaining—instead of supplanting—natural ecosystem function in the process of increasing food availability. Biocultural restoration efforts in Hawai‘i, aimed at revitalizing Indigenous stewardship, have included restoration of loko i‘a to sustainably increase the availability of local seafood. While it is clear from historical accounts that loko i‘a can augment fish within estuaries, their role as a nursery ground that supplements surrounding fish populations and fisheries harvest (i.e., providing spillover) remains unstudied in the current literature. This study aimed to test the extent to which loko i‘a restoration can supplement fish populations and fisheries harvest both inside the loko i‘a and in the surrounding waters. A food web model was constructed representing nutrients, phytoplankton, fish, and fisheries in three distinct habitats. The model, set in Kāne‘ohe Bay, O‘ahu, Hawai‘i, revealed that there were interactive effects of the area under loko i‘a management, bay fishing effort, and fish dispersal rates on fish density and fisheries harvest. We found that increasing the area under loko i‘a management not only increased loko i‘a fish density and fisheries harvest but also created the potential to supplement bay fish populations and fisheries harvest under certain scenarios. We also identified a trade‐off whereby at high fish dispersal rates, a larger area under loko i‘a management provided maximal benefits to the bay fish population and fisheries harvest, while at low fish dispersal rates, a smaller area under loko i‘a management was more beneficial to bay fish populations and harvest. As expected, loko i‘a also created a surplus of fish within the pond. Our results support the idea that restoration of Indigenous aquaculture systems can positively impact conservation efforts and food security by increasing local fish availability, through both direct production and supplementation of surrounding fish stocks.

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Section: Limitations and Future Directionsmentioning

confidence: 99%