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Acidification of seawater owing to oceanic up- take of atmospheric CO2 originating from human activi- ties such as burning of fossil fuels and land-use changes has raised serious concerns regarding its adverse effects on corals and calcifying communities. Here we demon- strate a net loss of calcium carbonate (CaCO3) material as a result of decreased calcification and increased car- bonate dissolution from replicated subtropical coral reef communities (n=3) incubated in continuous-flow meso- cosms subject to future seawater conditions. The calci- fying community was dominated by the coral Montipora capitata. Daily average community calcification or Net Ecosystem Calcification (NEC=CaCO 3 production - disso- lution) was positive at 3.3 mmol CaCO3 m 2 h 1 under am- bient seawater pCO2 conditions as opposed to negative at 0.04 mmol CaCO3 m 2 h 1 under seawater conditions of double the ambient pCO2. These experimental results pro- vide support for the conclusion that some net calcifying communities could become subject to net dissolution in re- sponse to anthropogenic ocean acidification within this cen- tury. Nevertheless, individual corals remained healthy, ac- tively calcified (albeit slower than at present rates), and de- posited significant amounts of CaCO 3 under the prevailing experimental seawater conditions of elevated pCO2.

biogeosciences

Net Loss of CaCO&amp;lt;sub&amp;gt;3&amp;lt;/sub&amp;gt; from a subtropical calcifying community due to seawater acidification: mesocosm-scale experimental evidence