Species-specific Differences In Thermal Tolerance May Define Susceptibility To Intracellular Acidosis In Reef Corals.
Species-specific differences in thermal tolerance may define susceptibility to intracellular acidosis in reef corals. Gibbin, E. M.Putnam, H. M.Gates, R. D.Nitschke, M. R.Davy, S. K. It is widely acknowledged that temperature stress affects an organism's sensitivity to ocean acidification and vice versa, yet it is not clear how the two are mechanistically linked. Here, we induced thermal stress in two coral species with differing bleaching susceptibilities to measure how a reduction in photosynthetic performance impacts intracellular pH (pH(i)) regulation in the symbiotic dinoflagellates (Symbiodinium sp.) and their host coral cells. Our hypothesis was that thermally induced photosynthetic dysfunction in the symbiont would prevent the efficient removal of additional CO2, lowering its buffering capacity and thus increasing the host cell's susceptibility to intracellular acidosis. To test this, we exposed Pocillopora damicornis (a thermally sensitive coral) and Montipora capitata (a thermally resilient coral) to four different temperature treatments (23.8, 25.5, 28 and 31 A degrees C) for 1 week. We then isolated intact symbiotic coral endodermal cells, placed them in a live-cell ch Continue reading >>