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. 2017 Aug 8;7:7573. doi: 10.1038/s41598-017-08003-z

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© The Author(s) 2017

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Calcification rates of Acropora youngei (grey triangles) and Pocillopora damicornis (black dots) as a function of estimates of the aragonite saturation state in the calcifying fluid (Ω_{arag cf}) made using estimates of pH_cf and DIC_cf. The horizontal error-bars represent the uncertainties on Ω_{arag cf} estimates. The mean relationship between calcification and Ω_aragCF for both species was best fitted by the polynomial relationship y = 0.025X ² + 0.63x + 3.03 (black line). The red lines corresponded to a “bio-inorganic model” of calcification based on the known abiotic rate kinetics of CaCO₃ precipitation as a function the aragonite saturation state Ω_cf (IpHRAC)⁹. This model is based on an empirical exponential rate dependence law for carbonate precipitation (G): G = k _a (Ω _cf − 1)ⁿ; with k _a = −0.0177T² + 1.47 T + 14.9 and n = 0.0628 T + 0.0985.