Effects of hypoxia and ocean acidification on the upper thermal niche boundaries of coral reef fishes
Rising ocean temperatures are predicted to cause a poleward shift in the distribution of marine fishes occupying the extent of latitudes tolerable within their thermal range boundaries. A prevailing theory suggests that the upper thermal limits of fishes are constrained by hypoxia and ocean acidific...
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crroyalsociety:10.1098/rsbl.2017.0135 2024-10-13T14:09:58+00:00 Effects of hypoxia and ocean acidification on the upper thermal niche boundaries of coral reef fishes Ern, Rasmus Johansen, Jacob L. Rummer, Jodie L. Esbaugh, Andrew J. Centre of Excellence for Environmental Decisions, Australian Research Council Carlsbergfondet Division of Emerging Frontiers Company of Biologists 2017 http://dx.doi.org/10.1098/rsbl.2017.0135 https://royalsocietypublishing.org/doi/pdf/10.1098/rsbl.2017.0135 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsbl.2017.0135 en eng The Royal Society https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ Biology Letters volume 13, issue 7, page 20170135 ISSN 1744-9561 1744-957X journal-article 2017 crroyalsociety https://doi.org/10.1098/rsbl.2017.0135 2024-09-17T04:34:47Z Rising ocean temperatures are predicted to cause a poleward shift in the distribution of marine fishes occupying the extent of latitudes tolerable within their thermal range boundaries. A prevailing theory suggests that the upper thermal limits of fishes are constrained by hypoxia and ocean acidification. However, some eurythermal fish species do not conform to this theory, and maintain their upper thermal limits in hypoxia. Here we determine if the same is true for stenothermal species. In three coral reef fish species we tested the effect of hypoxia on upper thermal limits, measured as critical thermal maximum (CT max ). In one of these species we also quantified the effect of hypoxia on oxygen supply capacity, measured as aerobic scope (AS). In this species we also tested the effect of elevated CO 2 (simulated ocean acidification) on the hypoxia sensitivity of CT max . We found that CT max was unaffected by progressive hypoxia down to approximately 35 mmHg, despite a substantial hypoxia-induced reduction in AS. Below approximately 35 mmHg, CT max declined sharply with water oxygen tension ( P w O 2 ). Furthermore, the hypoxia sensitivity of CT max was unaffected by elevated CO 2 . Our findings show that moderate hypoxia and ocean acidification do not constrain the upper thermal limits of these tropical, stenothermal fishes. Article in Journal/Newspaper Ocean acidification The Royal Society Biology Letters 13 7 20170135 |
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English |
description |
Rising ocean temperatures are predicted to cause a poleward shift in the distribution of marine fishes occupying the extent of latitudes tolerable within their thermal range boundaries. A prevailing theory suggests that the upper thermal limits of fishes are constrained by hypoxia and ocean acidification. However, some eurythermal fish species do not conform to this theory, and maintain their upper thermal limits in hypoxia. Here we determine if the same is true for stenothermal species. In three coral reef fish species we tested the effect of hypoxia on upper thermal limits, measured as critical thermal maximum (CT max ). In one of these species we also quantified the effect of hypoxia on oxygen supply capacity, measured as aerobic scope (AS). In this species we also tested the effect of elevated CO 2 (simulated ocean acidification) on the hypoxia sensitivity of CT max . We found that CT max was unaffected by progressive hypoxia down to approximately 35 mmHg, despite a substantial hypoxia-induced reduction in AS. Below approximately 35 mmHg, CT max declined sharply with water oxygen tension ( P w O 2 ). Furthermore, the hypoxia sensitivity of CT max was unaffected by elevated CO 2 . Our findings show that moderate hypoxia and ocean acidification do not constrain the upper thermal limits of these tropical, stenothermal fishes. |
author2 |
Centre of Excellence for Environmental Decisions, Australian Research Council Carlsbergfondet Division of Emerging Frontiers Company of Biologists |
format |
Article in Journal/Newspaper |
author |
Ern, Rasmus Johansen, Jacob L. Rummer, Jodie L. Esbaugh, Andrew J. |
spellingShingle |
Ern, Rasmus Johansen, Jacob L. Rummer, Jodie L. Esbaugh, Andrew J. Effects of hypoxia and ocean acidification on the upper thermal niche boundaries of coral reef fishes |
author_facet |
Ern, Rasmus Johansen, Jacob L. Rummer, Jodie L. Esbaugh, Andrew J. |
author_sort |
Ern, Rasmus |
title |
Effects of hypoxia and ocean acidification on the upper thermal niche boundaries of coral reef fishes |
title_short |
Effects of hypoxia and ocean acidification on the upper thermal niche boundaries of coral reef fishes |
title_full |
Effects of hypoxia and ocean acidification on the upper thermal niche boundaries of coral reef fishes |
title_fullStr |
Effects of hypoxia and ocean acidification on the upper thermal niche boundaries of coral reef fishes |
title_full_unstemmed |
Effects of hypoxia and ocean acidification on the upper thermal niche boundaries of coral reef fishes |
title_sort |
effects of hypoxia and ocean acidification on the upper thermal niche boundaries of coral reef fishes |
publisher |
The Royal Society |
publishDate |
2017 |
url |
http://dx.doi.org/10.1098/rsbl.2017.0135 https://royalsocietypublishing.org/doi/pdf/10.1098/rsbl.2017.0135 https://royalsocietypublishing.org/doi/full-xml/10.1098/rsbl.2017.0135 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_source |
Biology Letters volume 13, issue 7, page 20170135 ISSN 1744-9561 1744-957X |
op_rights |
https://royalsociety.org/journals/ethics-policies/data-sharing-mining/ |
op_doi |
https://doi.org/10.1098/rsbl.2017.0135 |
container_title |
Biology Letters |
container_volume |
13 |
container_issue |
7 |
container_start_page |
20170135 |
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1812817059269050368 |