Response of coral calcification and calcifying fluid composition to thermally induced bleaching stress

Abstract Severe, global-scale thermal stress events like those of 1998 and 2016, are becoming more frequent and intense, potentially compromising the future of coral reefs. Here we report the effects of the 1998 bleaching event on coral calcification as well as the composition of the calcifying flui...

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Autores principales:	J. P. D’Olivo, M. T. McCulloch
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/c11f09c490f446d088729bdf9c4a265a
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spelling	oai:doaj.org-article:c11f09c490f446d088729bdf9c4a265a2021-12-02T11:52:27ZResponse of coral calcification and calcifying fluid composition to thermally induced bleaching stress10.1038/s41598-017-02306-x2045-2322https://doaj.org/article/c11f09c490f446d088729bdf9c4a265a2017-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02306-xhttps://doaj.org/toc/2045-2322Abstract Severe, global-scale thermal stress events like those of 1998 and 2016, are becoming more frequent and intense, potentially compromising the future of coral reefs. Here we report the effects of the 1998 bleaching event on coral calcification as well as the composition of the calcifying fluid (cf) from which corals precipitate their calcium carbonate skeletons. This was investigated by using the Sr/Ca, Li/Mg (temperature), and boron isotopes (δ11B) and B/Ca (carbonate chemistry) proxies in a Porites sp. coral. Following the summer of 1998 the coral exhibited a prolonged period (~18 months) of reduced calcification (~60%) and a breakdown in the seasonality of the geochemical proxies. However, the maintenance of elevated dissolved inorganic carbon (DICcf; >×2 seawater) and pHcf (>8.3 compared to seawater ~8.0) even during severe stress of 1998 indicate that a minimum threshold of high aragonite saturation state (Ωcf) of ~14 (~×4 seawater), is an essential pre-requisite for coral calcification. However, despite maintaining elevated levels of Ωcf even under severe stress, coral growth is still impaired. We attribute this to reductions in either the effective active volume of calcification and/or DICcf as bleaching compromises the photosynthetically fixed carbon pool available to the coral.J. P. D’OlivoM. T. McCullochNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-15 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q J. P. D’Olivo M. T. McCulloch Response of coral calcification and calcifying fluid composition to thermally induced bleaching stress
description	Abstract Severe, global-scale thermal stress events like those of 1998 and 2016, are becoming more frequent and intense, potentially compromising the future of coral reefs. Here we report the effects of the 1998 bleaching event on coral calcification as well as the composition of the calcifying fluid (cf) from which corals precipitate their calcium carbonate skeletons. This was investigated by using the Sr/Ca, Li/Mg (temperature), and boron isotopes (δ11B) and B/Ca (carbonate chemistry) proxies in a Porites sp. coral. Following the summer of 1998 the coral exhibited a prolonged period (~18 months) of reduced calcification (~60%) and a breakdown in the seasonality of the geochemical proxies. However, the maintenance of elevated dissolved inorganic carbon (DICcf; >×2 seawater) and pHcf (>8.3 compared to seawater ~8.0) even during severe stress of 1998 indicate that a minimum threshold of high aragonite saturation state (Ωcf) of ~14 (~×4 seawater), is an essential pre-requisite for coral calcification. However, despite maintaining elevated levels of Ωcf even under severe stress, coral growth is still impaired. We attribute this to reductions in either the effective active volume of calcification and/or DICcf as bleaching compromises the photosynthetically fixed carbon pool available to the coral.
format	article
author	J. P. D’Olivo M. T. McCulloch
author_facet	J. P. D’Olivo M. T. McCulloch
author_sort	J. P. D’Olivo
title	Response of coral calcification and calcifying fluid composition to thermally induced bleaching stress
title_short	Response of coral calcification and calcifying fluid composition to thermally induced bleaching stress
title_full	Response of coral calcification and calcifying fluid composition to thermally induced bleaching stress
title_fullStr	Response of coral calcification and calcifying fluid composition to thermally induced bleaching stress
title_full_unstemmed	Response of coral calcification and calcifying fluid composition to thermally induced bleaching stress
title_sort	response of coral calcification and calcifying fluid composition to thermally induced bleaching stress
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/c11f09c490f446d088729bdf9c4a265a
work_keys_str_mv	AT jpdolivo responseofcoralcalcificationandcalcifyingfluidcompositiontothermallyinducedbleachingstress AT mtmcculloch responseofcoralcalcificationandcalcifyingfluidcompositiontothermallyinducedbleachingstress
_version_	1718395067752775680

Response of coral calcification and calcifying fluid composition to thermally induced bleaching stress

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