High light alongside elevated PCO2alleviates thermal depression of photosynthesis in a hard coral (Pocillopora acuta)
The absorbtion of human-emitted CO by the oceans (elevated ) is projected to alter the physiological performance of coral reef organisms by perturbing seawater chemistry (i.e. ocean acidification). Simultaneously, greenhouse gas emissions are driving ocean warming and changes in irradiance (through...
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The Company of Biologists
2020
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:bf44697 2023-05-15T17:50:50+02:00 High light alongside elevated PCO2alleviates thermal depression of photosynthesis in a hard coral (Pocillopora acuta) Mason, Robert A. B. Wall, Christopher B. Cunning, Ross Dove, Sophie Gates, Ruth D. 2020-10-15 https://espace.library.uq.edu.au/view/UQ:bf44697/UQbf44697_OA.pdf https://espace.library.uq.edu.au/view/UQ:bf44697 eng eng The Company of Biologists doi:10.1242/jeb.223198 issn:0022-0949 issn:1477-9145 orcid:0000-0002-2725-2449 orcid:0000-0003-1823-8634 Not set FP-91779401-1 NSF-DBI-1400787 Insect Science Animal Science and Zoology Aquatic Science Physiology Ecology Evolution Behavior and Systematics Molecular Biology 1103 Animal Science and Zoology 1104 Aquatic Science 1105 Ecology 1109 Insect Science 1312 Molecular Biology 1314 Physiology Journal Article 2020 ftunivqespace https://doi.org/10.1242/jeb.223198 2020-12-29T01:40:41Z The absorbtion of human-emitted CO by the oceans (elevated ) is projected to alter the physiological performance of coral reef organisms by perturbing seawater chemistry (i.e. ocean acidification). Simultaneously, greenhouse gas emissions are driving ocean warming and changes in irradiance (through turbidity and cloud cover), which have the potential to influence the effects of ocean acidification on coral reefs. Here, we explored whether physiological impacts of elevated on a coral-algal symbiosis (Symbiodiniaceae) are mediated by light and/or temperature levels. In a 39 day experiment, elevated (962 versus 431 µatm ) had an interactive effect with midday light availability (400 versus 800 µmol photons m s) and temperature (25 versus 29°C) on areal gross and net photosynthesis, for which a decline at 29°C was ameliorated under simultaneous high- and high-light conditions. Light-enhanced dark respiration increased under elevated and/or elevated temperature. Symbiont to host cell ratio and chlorophyll per symbiont increased at elevated temperature, whilst symbiont areal density decreased. The ability of moderately strong light in the presence of elevated to alleviate the temperature-induced decrease in photosynthesis suggests that higher substrate availability facilitates a greater ability for photochemical quenching, partially offsetting the impacts of high temperature on the photosynthetic apparatus. Future environmental changes that result in moderate increases in light levels could therefore assist the holobiont to cope with the 'one-two punch' of rising temperatures in the presence of an acidifying ocean. Article in Journal/Newspaper Ocean acidification The University of Queensland: UQ eSpace Journal of Experimental Biology 223 20 |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Insect Science Animal Science and Zoology Aquatic Science Physiology Ecology Evolution Behavior and Systematics Molecular Biology 1103 Animal Science and Zoology 1104 Aquatic Science 1105 Ecology 1109 Insect Science 1312 Molecular Biology 1314 Physiology |
spellingShingle |
Insect Science Animal Science and Zoology Aquatic Science Physiology Ecology Evolution Behavior and Systematics Molecular Biology 1103 Animal Science and Zoology 1104 Aquatic Science 1105 Ecology 1109 Insect Science 1312 Molecular Biology 1314 Physiology Mason, Robert A. B. Wall, Christopher B. Cunning, Ross Dove, Sophie Gates, Ruth D. High light alongside elevated PCO2alleviates thermal depression of photosynthesis in a hard coral (Pocillopora acuta) |
topic_facet |
Insect Science Animal Science and Zoology Aquatic Science Physiology Ecology Evolution Behavior and Systematics Molecular Biology 1103 Animal Science and Zoology 1104 Aquatic Science 1105 Ecology 1109 Insect Science 1312 Molecular Biology 1314 Physiology |
description |
The absorbtion of human-emitted CO by the oceans (elevated ) is projected to alter the physiological performance of coral reef organisms by perturbing seawater chemistry (i.e. ocean acidification). Simultaneously, greenhouse gas emissions are driving ocean warming and changes in irradiance (through turbidity and cloud cover), which have the potential to influence the effects of ocean acidification on coral reefs. Here, we explored whether physiological impacts of elevated on a coral-algal symbiosis (Symbiodiniaceae) are mediated by light and/or temperature levels. In a 39 day experiment, elevated (962 versus 431 µatm ) had an interactive effect with midday light availability (400 versus 800 µmol photons m s) and temperature (25 versus 29°C) on areal gross and net photosynthesis, for which a decline at 29°C was ameliorated under simultaneous high- and high-light conditions. Light-enhanced dark respiration increased under elevated and/or elevated temperature. Symbiont to host cell ratio and chlorophyll per symbiont increased at elevated temperature, whilst symbiont areal density decreased. The ability of moderately strong light in the presence of elevated to alleviate the temperature-induced decrease in photosynthesis suggests that higher substrate availability facilitates a greater ability for photochemical quenching, partially offsetting the impacts of high temperature on the photosynthetic apparatus. Future environmental changes that result in moderate increases in light levels could therefore assist the holobiont to cope with the 'one-two punch' of rising temperatures in the presence of an acidifying ocean. |
format |
Article in Journal/Newspaper |
author |
Mason, Robert A. B. Wall, Christopher B. Cunning, Ross Dove, Sophie Gates, Ruth D. |
author_facet |
Mason, Robert A. B. Wall, Christopher B. Cunning, Ross Dove, Sophie Gates, Ruth D. |
author_sort |
Mason, Robert A. B. |
title |
High light alongside elevated PCO2alleviates thermal depression of photosynthesis in a hard coral (Pocillopora acuta) |
title_short |
High light alongside elevated PCO2alleviates thermal depression of photosynthesis in a hard coral (Pocillopora acuta) |
title_full |
High light alongside elevated PCO2alleviates thermal depression of photosynthesis in a hard coral (Pocillopora acuta) |
title_fullStr |
High light alongside elevated PCO2alleviates thermal depression of photosynthesis in a hard coral (Pocillopora acuta) |
title_full_unstemmed |
High light alongside elevated PCO2alleviates thermal depression of photosynthesis in a hard coral (Pocillopora acuta) |
title_sort |
high light alongside elevated pco2alleviates thermal depression of photosynthesis in a hard coral (pocillopora acuta) |
publisher |
The Company of Biologists |
publishDate |
2020 |
url |
https://espace.library.uq.edu.au/view/UQ:bf44697/UQbf44697_OA.pdf https://espace.library.uq.edu.au/view/UQ:bf44697 |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
doi:10.1242/jeb.223198 issn:0022-0949 issn:1477-9145 orcid:0000-0002-2725-2449 orcid:0000-0003-1823-8634 Not set FP-91779401-1 NSF-DBI-1400787 |
op_doi |
https://doi.org/10.1242/jeb.223198 |
container_title |
Journal of Experimental Biology |
container_volume |
223 |
container_issue |
20 |
_version_ |
1766157737372155904 |