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Relative impacts of simultaneous stressors on a pelagic marine ecosystem

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Woodworth-Jefcoats, PA, Blanchard, JL ORCID: 0000-0003-0532-4824 and Drazen, JC 2019 , 'Relative impacts of simultaneous stressors on a pelagic marine ecosystem' , Frontiers in Marine Science, vol. 6, no. JUL , pp. 1-16 , doi: 10.3389/fmars.2019.00383.

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Abstract

Climate change and fishing are two of the greatest anthropogenic stressors on marine ecosystems. We investigate the effects of these stressors on Hawaii's deep-set longline fishery for bigeye tuna (Thunnus obesus) and the ecosystem which supports it using a size-based food web model that incorporates individual species and captures the metabolic effects of rising ocean temperatures. We find that when fishing and climate change are examined individually, fishing is the greater stressor. This suggests that proactive fisheries management could be a particularly effective tool for mitigating anthropogenic stressors either by balancing or outweighing climate effects. However, modeling these stressors jointly shows that even large management changes cannot completely offset climate effects. Our results suggest that a decline in Hawaii's longline fishery yield may be inevitable. The effect of climate change on the ecosystem depends primarily upon the intensity of fishing mortality. Management measures which take this into account can both minimize fishery decline and support at least some level of ecosystem resilience.

Item Type: Article
Authors/Creators:Woodworth-Jefcoats, PA and Blanchard, JL and Drazen, JC
Keywords: climate modelling, fish projections, multiple stressors, climate change, fishing, pelagic, bigeye tuna, size-based model, food web model
Journal or Publication Title: Frontiers in Marine Science
Publisher: Frontiers Research Foundation
ISSN: 2296-7745
DOI / ID Number: 10.3389/fmars.2019.00383
Copyright Information:

Copyright 2019 Woodworth-Jefcoats, Blanchard and Drazen. This is an openaccess article distributed under the terms of the Creative Commons AttributionLicense (CC BY)

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