Ocean acidification affects coral growth by reducing skeletal density
Ocean acidification (OA) is considered an important threat to coral reef ecosystems, because it reduces the availability of carbonate ions that reef-building corals need to produce their skeletons. However, while theory predicts that coral calcification rates decline as carbonate ion concentrations...
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Online Access: | https://eprints.soton.ac.uk/417521/ https://eprints.soton.ac.uk/417521/1/Mollica_et_al_2018_PNAS.pdf |
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ftsouthampton:oai:eprints.soton.ac.uk:417521 2023-08-27T04:11:18+02:00 Ocean acidification affects coral growth by reducing skeletal density Mollica, Nathaniel R. Guo, Weifu Cohen, Anne L. Huang, Kuo-fang Foster, Gavin L. Donald, Hannah K. Solow, Andrew R. 2018-02 text https://eprints.soton.ac.uk/417521/ https://eprints.soton.ac.uk/417521/1/Mollica_et_al_2018_PNAS.pdf en English eng https://eprints.soton.ac.uk/417521/1/Mollica_et_al_2018_PNAS.pdf Mollica, Nathaniel R., Guo, Weifu, Cohen, Anne L., Huang, Kuo-fang, Foster, Gavin L., Donald, Hannah K. and Solow, Andrew R. (2018) Ocean acidification affects coral growth by reducing skeletal density. Proceedings of the National Academy of Sciences, 115 (8), 1754-1759, [201712806]. (doi:10.1073/pnas.1712806115 <http://dx.doi.org/10.1073/pnas.1712806115>). accepted_manuscript Article PeerReviewed 2018 ftsouthampton https://doi.org/10.1073/pnas.1712806115 2023-08-03T22:22:48Z Ocean acidification (OA) is considered an important threat to coral reef ecosystems, because it reduces the availability of carbonate ions that reef-building corals need to produce their skeletons. However, while theory predicts that coral calcification rates decline as carbonate ion concentrations decrease, this prediction is not consistently borne out in laboratory manipulation experiments or in studies of corals inhabiting naturally low-pH reefs today. The skeletal growth of corals consists of two distinct processes: extension (upward growth) and densification (lateral thickening). Here, we show that skeletal density is directly sensitive to changes in seawater carbonate ion concentration and thus, to OA, whereas extension is not. We present a numerical model of Porites skeletal growth that links skeletal density with the external seawater environment via its influence on the chemistry of coral calcifying fluid. We validate the model using existing coral skeletal datasets from six Porites species collected across five reef sites and use this framework to project the impact of 21st century OA on Porites skeletal density across the global tropics. Our model predicts that OA alone will drive up to 20.3 ± 5.4% decline in the skeletal density of reef-building Porites corals. Article in Journal/Newspaper Ocean acidification University of Southampton: e-Prints Soton Proceedings of the National Academy of Sciences 115 8 1754 1759 |
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University of Southampton: e-Prints Soton |
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ftsouthampton |
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English |
description |
Ocean acidification (OA) is considered an important threat to coral reef ecosystems, because it reduces the availability of carbonate ions that reef-building corals need to produce their skeletons. However, while theory predicts that coral calcification rates decline as carbonate ion concentrations decrease, this prediction is not consistently borne out in laboratory manipulation experiments or in studies of corals inhabiting naturally low-pH reefs today. The skeletal growth of corals consists of two distinct processes: extension (upward growth) and densification (lateral thickening). Here, we show that skeletal density is directly sensitive to changes in seawater carbonate ion concentration and thus, to OA, whereas extension is not. We present a numerical model of Porites skeletal growth that links skeletal density with the external seawater environment via its influence on the chemistry of coral calcifying fluid. We validate the model using existing coral skeletal datasets from six Porites species collected across five reef sites and use this framework to project the impact of 21st century OA on Porites skeletal density across the global tropics. Our model predicts that OA alone will drive up to 20.3 ± 5.4% decline in the skeletal density of reef-building Porites corals. |
format |
Article in Journal/Newspaper |
author |
Mollica, Nathaniel R. Guo, Weifu Cohen, Anne L. Huang, Kuo-fang Foster, Gavin L. Donald, Hannah K. Solow, Andrew R. |
spellingShingle |
Mollica, Nathaniel R. Guo, Weifu Cohen, Anne L. Huang, Kuo-fang Foster, Gavin L. Donald, Hannah K. Solow, Andrew R. Ocean acidification affects coral growth by reducing skeletal density |
author_facet |
Mollica, Nathaniel R. Guo, Weifu Cohen, Anne L. Huang, Kuo-fang Foster, Gavin L. Donald, Hannah K. Solow, Andrew R. |
author_sort |
Mollica, Nathaniel R. |
title |
Ocean acidification affects coral growth by reducing skeletal density |
title_short |
Ocean acidification affects coral growth by reducing skeletal density |
title_full |
Ocean acidification affects coral growth by reducing skeletal density |
title_fullStr |
Ocean acidification affects coral growth by reducing skeletal density |
title_full_unstemmed |
Ocean acidification affects coral growth by reducing skeletal density |
title_sort |
ocean acidification affects coral growth by reducing skeletal density |
publishDate |
2018 |
url |
https://eprints.soton.ac.uk/417521/ https://eprints.soton.ac.uk/417521/1/Mollica_et_al_2018_PNAS.pdf |
genre |
Ocean acidification |
genre_facet |
Ocean acidification |
op_relation |
https://eprints.soton.ac.uk/417521/1/Mollica_et_al_2018_PNAS.pdf Mollica, Nathaniel R., Guo, Weifu, Cohen, Anne L., Huang, Kuo-fang, Foster, Gavin L., Donald, Hannah K. and Solow, Andrew R. (2018) Ocean acidification affects coral growth by reducing skeletal density. Proceedings of the National Academy of Sciences, 115 (8), 1754-1759, [201712806]. (doi:10.1073/pnas.1712806115 <http://dx.doi.org/10.1073/pnas.1712806115>). |
op_rights |
accepted_manuscript |
op_doi |
https://doi.org/10.1073/pnas.1712806115 |
container_title |
Proceedings of the National Academy of Sciences |
container_volume |
115 |
container_issue |
8 |
container_start_page |
1754 |
op_container_end_page |
1759 |
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1775353982669029376 |