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A nonlinear calcification response to CO2-induced ocean acidification by the coral Oculina arbuscula

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Abstract

Anthropogenic elevation of atmospheric pCO2 is predicted to cause the pH of surface seawater to decline by 0.3–0.4 units by 2100 AD, causing a 50% reduction in seawater [CO3 2−] and undersaturation with respect to aragonite in high-latitude surface waters. We investigated the impact of CO2-induced ocean acidification on the temperate scleractinian coral Oculina arbuscula by rearing colonies for 60 days in experimental seawaters bubbled with air-CO2 gas mixtures of 409, 606, 903, and 2,856 ppm pCO2, yielding average aragonite saturation states (ΩA) of 2.6, 2.3, 1.6, and 0.8. Measurement of calcification (via buoyant weighing) and linear extension (relative to a 137Ba/138Ba spike) revealed that skeletal accretion was only minimally impaired by reductions in ΩA from 2.6 to 1.6, although major reductions were observed at 0.8 (undersaturation). Notably, the corals continued accreting new skeletal material even in undersaturated conditions, although at reduced rates. Correlation between rates of linear extension and calcification suggests that reduced calcification under ΩA = 0.8 resulted from reduced aragonite accretion, rather than from localized dissolution. Accretion of pure aragonite under each ΩA discounts the possibility that these corals will begin producing calcite, a less soluble form of CaCO3, as the oceans acidify. The corals’ nonlinear response to reduced ΩA and their ability to accrete new skeletal material in undersaturated conditions suggest that they strongly control the biomineralization process. However, our data suggest that a threshold seawater [CO3 2−] exists, below which calcification within this species (and possibly others) becomes impaired. Indeed, the strong negative response of O. arbuscula to ΩA = 0.8 indicates that their response to future pCO2-induced ocean acidification could be both abrupt and severe once the critical ΩA is reached.

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Acknowledgments

We are grateful to Greg Piniak at NOAA in Beaufort, North Carolina, for generously collecting and supplying the coral specimens used in this study. We thank Wade McGillis for providing gas standards. Michael Holcomb provided critical input in the design and implementation of these experiments. This work was supported with funding from UNC—Chapel Hill (to JBR), the Ocean and Climate Change Institute at WHOI (to JBR), the Tropical Research Institute at WHOI (to ALC), and the National Science Foundation (to ALC and DCM).

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Authors and Affiliations

  1. Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA, 02543, USA

    J. B. Ries, A. L. Cohen & D. C. McCorkle

  2. Department of Marine Sciences, University of North Carolina, Chapel Hill, 333 Chapman Hall, Campus Box 3300, Chapel Hill, NC, 27599, USA

    J. B. Ries

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  1. J. B. Ries
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  2. A. L. Cohen
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Correspondence to J. B. Ries.

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Ries, J.B., Cohen, A.L. & McCorkle, D.C. A nonlinear calcification response to CO2-induced ocean acidification by the coral Oculina arbuscula . Coral Reefs 29, 661–674 (2010). https://doi.org/10.1007/s00338-010-0632-3

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