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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2017
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ftjamescook:oai:researchonline.jcu.edu.au:50868 2024-02-11T10:07:22+01:00 Effects of hypoxia and ocean acidification on the upper thermal niche boundaries of coral reef fishes Ern, Rasmus Johansen, Jacob Rummer, Jodie L. Esbaugh, Andrew J. 2017 application/pdf https://researchonline.jcu.edu.au/50868/1/50868_Ern%20et%20al_2017.pdf unknown Royal Society Publishing https://doi.org/10.1098/rsbl.2017.0135 https://researchonline.jcu.edu.au/50868/ https://researchonline.jcu.edu.au/50868/1/50868_Ern%20et%20al_2017.pdf Ern, Rasmus, Johansen, Jacob, Rummer, Jodie L., and Esbaugh, Andrew J. (2017) Effects of hypoxia and ocean acidification on the upper thermal niche boundaries of coral reef fishes. Biology Letters, 13 (7). 20170135. restricted Article PeerReviewed 2017 ftjamescook https://doi.org/10.1098/rsbl.2017.0135 2024-01-22T23:40:47Z 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 (CTmax). 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 CO2 (simulated ocean acidification) on the hypoxia sensitivity of CTmax. We found that CTmax was unaffected by progressive hypoxia down to approximately 35 mmHg, despite a substantial hypoxia-induced reduction in AS. Below approximately 35 mmHg, CTmax declined sharply with water oxygen tension (PwO2). Furthermore, the hypoxia sensitivity of CTmax was unaffected by elevated CO2. 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 James Cook University, Australia: ResearchOnline@JCU Biology Letters 13 7 20170135 |
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James Cook University, Australia: ResearchOnline@JCU |
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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 (CTmax). 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 CO2 (simulated ocean acidification) on the hypoxia sensitivity of CTmax. We found that CTmax was unaffected by progressive hypoxia down to approximately 35 mmHg, despite a substantial hypoxia-induced reduction in AS. Below approximately 35 mmHg, CTmax declined sharply with water oxygen tension (PwO2). Furthermore, the hypoxia sensitivity of CTmax was unaffected by elevated CO2. Our findings show that moderate hypoxia and ocean acidification do not constrain the upper thermal limits of these tropical, stenothermal fishes. |
format |
Article in Journal/Newspaper |
author |
Ern, Rasmus Johansen, Jacob Rummer, Jodie L. Esbaugh, Andrew J. |
spellingShingle |
Ern, Rasmus Johansen, Jacob 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 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 |
Royal Society Publishing |
publishDate |
2017 |
url |
https://researchonline.jcu.edu.au/50868/1/50868_Ern%20et%20al_2017.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
https://doi.org/10.1098/rsbl.2017.0135 https://researchonline.jcu.edu.au/50868/ https://researchonline.jcu.edu.au/50868/1/50868_Ern%20et%20al_2017.pdf Ern, Rasmus, Johansen, Jacob, Rummer, Jodie L., and Esbaugh, Andrew J. (2017) Effects of hypoxia and ocean acidification on the upper thermal niche boundaries of coral reef fishes. Biology Letters, 13 (7). 20170135. |
op_rights |
restricted |
op_doi |
https://doi.org/10.1098/rsbl.2017.0135 |
container_title |
Biology Letters |
container_volume |
13 |
container_issue |
7 |
container_start_page |
20170135 |
_version_ |
1790605899222482944 |