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https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

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With the increasing anthropogenic CO 2  concentration, ocean acidification (OA) can have dramatic effects on coral reefs. However, the effects of OA on coral physiology and the associated microbes remain largely unknown. In the present study, reef-building coral  Acropora gemmifera  collected from a reef flat with highly fluctuating environmental condition in the South China Sea were exposed to three levels of partial pressure of carbon dioxide ( p CO 2 ) (i.e., 421, 923, and 2070 μatm) for four weeks. The microbial community structures associated with  A. gemmifera  under these treatments were analyzed using 16S rRNA gene barcode sequencing. The results revealed that the microbial community associated with  A. gemmifera  was highly diverse at the genus level and dominated by Alphaproteobacteria. More importantly, the microbial community structure remained rather stable under different  p CO 2  treatments. Photosynthesis and calcification in  A. gemmifera , as indicated by enrichment of δ 18 O and increased depletion of δ 13 C in the coral skeleton, were significantly impaired only at the high  p CO 2  (2070 μatm). These results suggest that  A. gemmifera  can maintain a high degree of stable microbial communities despite of significant physiological changes in response to extremely high  p CO 2 .

Changes in microbial communities, photosynthesis and calcification of the coral Acropora gemmifera in response to ocean acidification