Annual response of two Mediterranean azooxanthellate temperate corals to low-pH and high-temperature conditions

摘要: Ocean acidification (OA) and warming related to the anthropogenic increase in atmospheric CO2 have been shown detrimental effects on several marine organisms, especially those with calcium carbonate structures such as corals. In this study, we evaluate response of two Mediterranean shallow-water azooxanthellate corals projected pH seawater temperature (ST) scenarios for end century. The colonial coral Astroides calycularis solitary Leptopsammia pruvoti were grown aquaria over a year under fixed conditions, control (8.05 pHT units) low (7.72 pHT units), simulating annual ST cycles, natural high (+3 °C). organic matter (OM), lipid protein content tissue skeletal microdensity A. not affected by stress conditions (low pH, ST), but species exhibited mean 25 % decrease calcification rate at high-ST warm period 10 % porosity acidified treatment after full cycle. Conversely, an absence L. exposed low-pH treatments contrasted significant OM, 13 % following exposure. This species-specific suggests that different internal self-regulation strategies energy reallocation may allow certain cope more successfully than others global environmental changes.