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Vedor, M, Queiroz, N, Da Costa, I, Dos Santos, A, Vandeperre, F, Fontes, J, Afonso, P, Rosa, R, Humphries, NE and Sims, DW et al 2021 Climate-driven deoxygenation elevates fishing vulnerability for the ocean’s widest ranging shark. eLife, 10, e62508. https://doi.org/10.7554/eLife.62508
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53 Climate-driven deoxygenation elevates fishing vulnerability for the ocean's widest ranging shark.pdf - Published Version Available under License Creative Commons Attribution. Download (6MB) | Preview |
Abstract/Summary
Climate-driven expansions of ocean hypoxic zones are predicted to concentrate pelagic fish in oxygenated surface layers, but how expanding hypoxia and fisheries will interact to affect threatened pelagic sharks remains unknown. Here, analysis of satellite-tracked blue sharks and environmental modelling in the eastern tropical Atlantic oxygen minimum zone (OMZ) shows shark maximum dive depths decreased due to combined effects of decreasing dissolved oxygen (DO) at depth, high sea surface temperatures, and increased surface-layer net primary production. Multiple factors associated with climate-driven deoxygenation contributed to blue shark vertical habitat compression, potentially increasing their vulnerability to surface fisheries. Greater intensity of longline fishing effort occurred above the OMZ compared to adjacent waters. Higher shark catches were associated with strong DO gradients, suggesting potential aggregation along suitable DO gradients contributed to habitat compression and higher fishing-induced mortality. Fisheries controls to counteract deoxygenation effects on shark catches will be needed as oceans continue warming.
| Item Type: | Publication - Article |
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| Subjects: | Marine Sciences |
| Divisions: | Marine Biological Association of the UK > Ocean Biology |
| Depositing User: | Emily Smart |
| Date made live: | 03 Sep 2021 10:29 |
| Last Modified: | 09 Feb 2024 16:50 |
| URI: | https://plymsea.ac.uk/id/eprint/9331 |
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