Guillermic, Maxence, Cameron, Louise P., Corte, Ilian De, Misra, Sambuddha, Bijma, Jelle, de Beer, Dirk, Reymond, Claire, Westphal, Hildegard ORCID:, Ries, Justin B. and Eagle, Robert A. (2021) Thermal stress reduces pocilloporid coral resilience to ocean acidification by impairing control over calcifying fluid chemistry. Science Advances, 7 . DOI

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The combination of thermal stress and ocean acidification (OA) can more negatively affect coral calcification than
an individual stressors, but the mechanism behind this interaction is unknown. We used two independent methods
(microelectrode and boron geochemistry) to measure calcifying fluid pH (pH cf) and carbonate chemistry of the
corals Pocillopora damicornis and Stylophora pistillata grown under various temperature and pCO 2 conditions.
Although these approaches demonstrate that they record pH cf over different time scales, they reveal that both species can cope with OA under optimal temperatures (28°C) by elevating pH cf and aragonite saturation state (cf) in support of calcification. At 31°C, neither species elevated these parameters as they did at 28°C and, likewise, could not maintain substantially positive calcification rates under any pH treatment. These results reveal a previously uncharacterized influence of temperature on coral pHcf regulation—the apparent mechanism behind the negative interaction between thermal stress and OA on coral calcification

Document Type: Article
Programme Area: PA4
Research affiliation: Biogeochemistry and Geology > Geoecology & Carbonate Sedimentology
Refereed: Yes
Open Access Journal?: Yes
Date Deposited: 25 Aug 2020 13:54
Last Modified: 28 Mar 2024 13:22

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