Articles | Volume 20, issue 12
https://doi.org/10.5194/bg-20-2425-2023
https://doi.org/10.5194/bg-20-2425-2023
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27 Jun 2023
Research article | Highlight paper |  | 27 Jun 2023

Impact of deoxygenation and warming on global marine species in the 21st century

Anne L. Morée, Tayler M. Clarke, William W. L. Cheung, and Thomas L. Frölicher

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Marine warming and deoxygenation are projected to intensify and drive a relative decrease in global habitat viability penetrating to all depths with warming dominating at the surface and deoxygenation becomes increasingly important with depth. In a 2°C scenario of global warming, epipelagic species' habitat losses are generally in the order of 0.1-0.5 million km3, while mesopelagic habitat losses are 0.01-0.15 million km3 and demersal losses are in the order of about 0.00025 million km3.
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Ocean temperature and oxygen shape marine habitats together with species’ characteristics. We calculated the impacts of projected 21st-century warming and oxygen loss on the contemporary habitat volume of 47 marine species and described the drivers of these impacts. Most species lose less than 5 % of their habitat at 2 °C of global warming, but some species incur losses 2–3 times greater than that. We also calculate which species may be most vulnerable to climate change and why this is the case.
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