OCEAN ACIDIFICATION HAS NO EFFECT ON CORAL BLEACHING OR RECOVERY FOR SCLERACTINIAN CORALS
While effects of OA on hermatypic coral calcification are species-specific, the effects of OA on Symbiodinium photosynthesis are equivocal. Through the measurement of growth (calcification) and changes in photophysiological parameters (production, absorption) of the 2 scleractinian corals O. faveolata and P. astreoides, that were exposed to combinations of elevated pCO2 and temperature, the present study aims to establish an energetic model capable of quantifying future hermatypic coral calcification rates using autotrophic energetic inputs as predictors. Neither photosynthetic production or absorbance properties for O. faveolata was affected by pCO2 or temperature. P. astreoides also showed no effect of pCO2 on photosynthetic production or absorbance properties, but at high temperature (31.0 C), a significant reduction of 77% was seen for photosynthetic production and a reduction of 63% in absorbance properties. To further quantify the effect of OA on photophysiological function, P. astreoides that “bleached” at high temperature were allocated to ambient and high pCO2 treatments, at ambient temperature (27.0 C), where they were allowed to recover. Photosynthetic production recovered to ambient levels in 4 weeks, with no difference in recovery rates between ambient or high pCO2 treatments. Our goal was to increase the understanding of metabolic costs of OA and create a predictive model for future tropical reef systems, in an attempt to further our understanding on the effects of global climate change, as well as aiding in the management of current emission scenarios.
Brown, D. J., Instituto de Ciencias del Mar y Limnologia (ICMyL), UNAM, Mexico, firstname.lastname@example.org
Iglesias_Prieto, R., Instituto de Ciencias del Mar y Limnologia (ICMyL), UNAM, Mexico, email@example.com
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