Decoupling between the response of coral calcifying fluid pH and calcification to ocean acidification

Abstract Evaluating the factors responsible for differing species-specific sensitivities to declining seawater pH is central to understanding the mechanisms via which ocean acidification (OA) affects coral calcification. We report here the results of an experiment comparing the responses of the cora...

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Autores principales:	S. Comeau, C. E. Cornwall, M. T. McCulloch
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/b8d70a97df5241da98784d056ad77e53
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spelling	oai:doaj.org-article:b8d70a97df5241da98784d056ad77e532021-12-02T12:32:13ZDecoupling between the response of coral calcifying fluid pH and calcification to ocean acidification10.1038/s41598-017-08003-z2045-2322https://doaj.org/article/b8d70a97df5241da98784d056ad77e532017-08-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-08003-zhttps://doaj.org/toc/2045-2322Abstract Evaluating the factors responsible for differing species-specific sensitivities to declining seawater pH is central to understanding the mechanisms via which ocean acidification (OA) affects coral calcification. We report here the results of an experiment comparing the responses of the coral Acropora yongei and Pocillopora damicornis to differing pH levels (8.09, 7.81, and 7.63) over an 8-week period. Calcification of A. youngei was reduced by 35% at pH 7.63, while calcification of P. damicornis was unaffected. The pH in the calcifying fluid (pHcf) was determined using δ11B systematics, and for both species pHcf declined slightly with seawater pH, with the decrease being more pronounced in P. damicornis. The dissolved inorganic carbon concentration at the site of calcification (DICcf) was estimated using geochemical proxies (B/Ca and δ11B) and found to be double that of seawater DIC, and increased in both species as seawater pH decreased. As a consequence, the decline of the saturation state at the site of calcification (Ωcf) with OA was partially moderated by the DICcf increase. These results highlight that while pHcf, DICcf and Ωcf are important in the mineralization process, some corals are able to maintain their calcification rates despite shifts in their calcifying fluid carbonate chemistry.S. ComeauC. E. CornwallM. T. McCullochNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-10 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q S. Comeau C. E. Cornwall M. T. McCulloch Decoupling between the response of coral calcifying fluid pH and calcification to ocean acidification
description	Abstract Evaluating the factors responsible for differing species-specific sensitivities to declining seawater pH is central to understanding the mechanisms via which ocean acidification (OA) affects coral calcification. We report here the results of an experiment comparing the responses of the coral Acropora yongei and Pocillopora damicornis to differing pH levels (8.09, 7.81, and 7.63) over an 8-week period. Calcification of A. youngei was reduced by 35% at pH 7.63, while calcification of P. damicornis was unaffected. The pH in the calcifying fluid (pHcf) was determined using δ11B systematics, and for both species pHcf declined slightly with seawater pH, with the decrease being more pronounced in P. damicornis. The dissolved inorganic carbon concentration at the site of calcification (DICcf) was estimated using geochemical proxies (B/Ca and δ11B) and found to be double that of seawater DIC, and increased in both species as seawater pH decreased. As a consequence, the decline of the saturation state at the site of calcification (Ωcf) with OA was partially moderated by the DICcf increase. These results highlight that while pHcf, DICcf and Ωcf are important in the mineralization process, some corals are able to maintain their calcification rates despite shifts in their calcifying fluid carbonate chemistry.
format	article
author	S. Comeau C. E. Cornwall M. T. McCulloch
author_facet	S. Comeau C. E. Cornwall M. T. McCulloch
author_sort	S. Comeau
title	Decoupling between the response of coral calcifying fluid pH and calcification to ocean acidification
title_short	Decoupling between the response of coral calcifying fluid pH and calcification to ocean acidification
title_full	Decoupling between the response of coral calcifying fluid pH and calcification to ocean acidification
title_fullStr	Decoupling between the response of coral calcifying fluid pH and calcification to ocean acidification
title_full_unstemmed	Decoupling between the response of coral calcifying fluid pH and calcification to ocean acidification
title_sort	decoupling between the response of coral calcifying fluid ph and calcification to ocean acidification
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/b8d70a97df5241da98784d056ad77e53
work_keys_str_mv	AT scomeau decouplingbetweentheresponseofcoralcalcifyingfluidphandcalcificationtooceanacidification AT cecornwall decouplingbetweentheresponseofcoralcalcifyingfluidphandcalcificationtooceanacidification AT mtmcculloch decouplingbetweentheresponseofcoralcalcifyingfluidphandcalcificationtooceanacidification
_version_	1718394181101027328

Decoupling between the response of coral calcifying fluid pH and calcification to ocean acidification

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