PT  - JOURNAL ARTICLE
AU  - Guillermic, Maxence
AU  - Cameron, Louise P.
AU  - De Corte, Ilian
AU  - Misra, Sambuddha
AU  - Bijma, Jelle
AU  - de Beer, Dirk
AU  - Reymond, Claire E.
AU  - Westphal, Hildegard
AU  - Ries, Justin B.
AU  - Eagle, Robert A.
TI  - Thermal stress reduces pocilloporid coral resilience to ocean acidification by impairing control over calcifying fluid chemistry
AID  - 10.1126/sciadv.aba9958
DP  - 2021 Jan 01
TA  - Science Advances
PG  - eaba9958
VI  - 7
IP  - 2
4099  - http://advances.sciencemag.org/content/7/2/eaba9958.short
4100  - http://advances.sciencemag.org/content/7/2/eaba9958.full
SO  - Sci Adv2021 Jan 01; 7
AB  - 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 (pHcf) and carbonate chemistry of the corals Pocillopora damicornis and Stylophora pistillata grown under various temperature and pCO2 conditions. Although these approaches demonstrate that they record pHcf over different time scales, they reveal that both species can cope with OA under optimal temperatures (28°C) by elevating pHcf and aragonite saturation state (Ωcf) 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.