Seawater carbonate chemistry and coral reef community metabolism

Using fumes (5.0×0.3×0.3 m) located outdoors in Moorea, French Polynesia, we assembled local back reef communities with ~25% coral cover, and tested their response to pCO2 levels of 344, 633, 870 and 1146 μatm. Incubations began in late Austral spring (November 2015), and net community calcifcation (Gnet) and net community primary production (Pnet) were measured prior to treatments, 24 h after treatment began, and biweekly or monthly thereafter until early Austral autumn (March 2016).