RT Journal Article
SR Electronic
T1 Thermal stress reduces pocilloporid coral resilience to ocean acidification by impairing control over calcifying fluid chemistry
JF Science Advances
JO Sci Adv
FD American Association for the Advancement of Science
SP eaba9958
DO 10.1126/sciadv.aba9958
VO 7
IS 2
A1 Guillermic, Maxence
A1 Cameron, Louise P.
A1 De Corte, Ilian
A1 Misra, Sambuddha
A1 Bijma, Jelle
A1 de Beer, Dirk
A1 Reymond, Claire E.
A1 Westphal, Hildegard
A1 Ries, Justin B.
A1 Eagle, Robert A.
YR 2021
UL http://advances.sciencemag.org/content/7/2/eaba9958.abstract
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.