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

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Key calcifying reef taxa are currently threatened by thermal stress associated with elevated sea surface temperatures (SST) and reduced calcification linked to ocean acidification (OA). Here we undertook an 8 week experimental exposure to near-future climate change conditions and explored the microbiome response of the corals  Acropora millepora  and  Seriatopora hystrix , the crustose coralline algae  Hydrolithon onkodes , the foraminifera  Marginopora vertebralis  and  Heterostegina depressa  and the sea urchin  Echinometra  sp. Microbial communities of all taxa were tolerant of elevated  p CO 2 /reduced pH, exhibiting stable microbial communities between pH 8.1 ( p CO 2  479–499 μatm) and pH 7.9 ( p CO 2  738–835 μatm). In contrast, microbial communities of the CCA and foraminifera were sensitive to elevated seawater temperature, with a significant microbial shift involving loss of specific taxa and appearance of novel microbial groups occurring between 28 and 31 °C. An interactive effect between stressors was also identified, with distinct communities developing under different  p CO 2  conditions only evident at 31 °C. Microbiome analysis of key calcifying coral reef species under near-future climate conditions highlights the importance of assessing impacts from both increased SST and OA, as combinations of these global stressors can amplify microbial shifts which may have concomitant impacts for coral reef structure and function.

Host-associated coral reef microbes respond to the cumulative pressures of ocean warming and ocean acidification