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. 2017 May 30;8:15686. doi: 10.1038/ncomms15686

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Copyright © 2017, The Author(s)

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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(a) Covariation of calcifying fluid saturation state (Ω_cf) with reef-water temperature showing a five- to sixfold elevation in Ω_cf relative to reef-waters for Porites corals from Davies Reef (D-2 and D-3) in the Great Barrier Reef and from Coral Bay (CB-1 and CB-2) in the Ningaloo Reef. Note the very narrow range (±5 to ±10%) of high Ω_cf values for each colony. (b) Subparallel arrays of inversely correlated (r²=0.88–0.94) calcifying fluid pH_cf and DIC_cf/DIC_sw values reflecting specific bio-environmental controls at the colony level on metabolic DIC_cf/DIC_sw. Seasonal variations in metabolic supplied DIC_cf are offset by opposing changes in pH_cf that act to moderate the overall variations in Ω_cf, the ultimate controller of skeletal growth rates.