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Coral Reefs

, Volume 34, Issue 4, pp 1139–1149 | Cite as

Response of Acropora digitifera to ocean acidification: constraints from δ11B, Sr, Mg, and Ba compositions of aragonitic skeletons cultured under variable seawater pH

  • Kentaro Tanaka
  • Michael Holcomb
  • Asami Takahashi
  • Haruko Kurihara
  • Ryuji Asami
  • Ryuichi Shinjo
  • Kohki Sowa
  • Kai Rankenburg
  • Tsuyoshi Watanabe
  • Malcolm McCulloch
Report

Abstract

The response of Acropora digitifera to ocean acidification is determined using geochemical proxy measurements of the skeletal composition of A. digitifera cultured under a range of pH levels. We show that the chemical composition (δ11B, Sr/Ca, Mg/Ca, and Ba/Ca) of the coral skeletons can provide quantitative constraints on the effects of seawater pH on the pH in the calcification fluid (pHCF) and the mechanisms controlling the incorporation of trace elements into coral aragonite. With the decline of seawater pH, the skeletal δ11B value decreased, while the Sr/Ca ratio showed an increasing trend. The relationship between Mg/Ca and Ba/Ca versus seawater pH was not significant. Inter-colony variation of δ11B was insignificant, although inter-colony variation was observed for Ba/Ca. The decreasing trend of pHCF calculated from δ11B was from ~8.5, 8.4, and 8.3 for seawater pH of ~8.1, 7.8, and 7.4, respectively. Model calculations based on Sr/Ca and pHCF suggest that upregulation of pHCF occurs via exchange of H+ with Ca2+ with kinetic effects (Rayleigh fractionation), reducing Sr/Ca relative to inorganic deposition of aragonite from seawater. We show that it is possible to constrain the overall carbonate chemistry of the calcifying fluid with estimates of the carbonate saturation of the calcifying fluid (Ω CF) being derived from skeletal Sr/Ca and pHCF (from δ11B). These estimates suggest that the aragonite saturation state of the calcifying fluid Ω CF is elevated by a factor of 5–10 relative to ambient seawater under all treatment conditions.

Keywords

Coral aragonite Boron isotopes Sr/Ca Ocean acidification Calcification 

Notes

Acknowledgments

We thank H. Osieriski for support of geochemical analyses. We also thank to J. Zinke, K. Shirai, M. Hori, and two anonymous reviewers for fruitful comments. We also thank International Research Hub Project for Climate Change, Coral Reef/Island Dynamics (the University of the Ryukyus), and Strategic Young Researcher Overseas Visits Program for Accelerating Brain Circulation (G2301), and the Australian Research Council (ARC) Centre of Excellence for Coral Reef Studies. M. McCulloch and M. Holcomb were also supported by ARC Laureate Fellowship and Super Science funding, respectively.

Supplementary material

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Supplementary material 1 (DOC 41 kb)
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Supplementary material 2 (DOCX 26 kb)
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Supplementary material 3 (EPS 1417 kb)
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Supplementary material 4 (EPS 1283 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Kentaro Tanaka
    • 1
    • 2
  • Michael Holcomb
    • 2
    • 3
  • Asami Takahashi
    • 4
  • Haruko Kurihara
    • 5
  • Ryuji Asami
    • 6
  • Ryuichi Shinjo
    • 6
  • Kohki Sowa
    • 1
    • 2
  • Kai Rankenburg
    • 2
  • Tsuyoshi Watanabe
    • 1
  • Malcolm McCulloch
    • 2
    • 3
  1. 1.Department of Natural History Sciences, Graduate School of ScienceHokkaido UniversitySapporoJapan
  2. 2.School of Earth and EnvironmentThe University of Western AustraliaCrawleyAustralia
  3. 3.ARC Centre of Excellence for Coral Reef StudiesThe University of Western AustraliaCrawleyAustralia
  4. 4.Graduate School of Engineering and ScienceUniversity of the RyukyusNishiharaJapan
  5. 5.Department of Chemistry, Biology and Marine ScienceUniversity of the RyukyusNishiharaJapan
  6. 6.Department of Physics and Earth SciencesUniversity of the RyukyusNishiharaJapan

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