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In a study designed to determine if a set of species-specific "tipping points" might exist in the calcification responses of coral reef calcifiers to increasing ocean acidification (OA) driven by elevated atmospheric CO2 concentrations, Comeau et al. (2013) "compared the effects of six partial pressures of CO2 from 28 Pa to 210 Pa on the net calcification of four corals (Acropora pulchra, Porites rus, Pocillopora damicornis, and Pavona cactus), and four calcified algae (Hydrolithon onkodes, Lithophyllum flavescens, Halimeda macroloba, and Halimeda minima)." This they did from August to October of 2011 in Moorea, French Polynesia, using organisms collected from the back reef of the island's north shore at 1-2 meters depth, which they placed in "a mesocosm apparatus consisting of 12 tanks that allowed for the maintenance of six PCO2 treatments in duplicate," where the calcifiers were studied in detail for several 2-week periods.
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