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Coral Reefs

, Volume 22, Issue 4, pp 405–415 | Cite as

Microanalysis of C and O isotopes of azooxanthellate and zooxanthellate corals by ion microprobe

  • C. Rollion-BardEmail author
  • D. Blamart
  • J.-P. Cuif
  • A. Juillet-Leclerc
Report

Abstract

We have determined the δ18O and δ13C values of azooxanthellate (Lophelia pertusa) and zooxanthellate (Porites lutea) corals at a micrometer scale using an ion microprobe (SIMS—secondary ion mass spectrometry). In P. lutea, centers of calcification are small (10 to 15 μm) and difficult to locate during measurements. In L. pertusa, they are large (50 μm) and arranged in lines of centers of calcification. Our results show that centers of calcification in L. pertusa have a restricted range of variation in δ18O [-2.8±0.3‰ (PDB)], and a larger range in δ13C [14.3 to 10.9‰ (PDB)]. Surrounding skeletal fibers exhibit large isotopic variation both for C and O (up to 12‰), and δ13C and δ18O are positively correlated. The C and O isotopic compositions of the center of calcification deviate from this linear trend at the lightest δ18O values of the surrounding fibers. Ion microprobe results on P. lutea demonstrate also a large range of variation for the δ18O values (up to 10‰). No correlation is found with C isotopes that exhibit, in comparison with L. pertusa, a small range of variation (2‰). This variation of δ18O at a micrometer scale is probably the result of two processes: (1) an isotopic equilibrium calcification with 1 pH unit variation in the calcification fluid as indicated by direct measurements of coelenteron pH in the coral Galaxea fascicularis (Al-Horani et al. 2003) and (2) a kinetic fractionation. The δ13C apparent disequilibrium in P. lutea may be the result of mixing between metabolic CO2 (respiration) and dissolved inorganic carbon (DIC) coming directly from seawater.

Keywords

Corals Oxygen isotopes Carbon isotopes Ion microprobe Porites lutea Lophelia pertusa 

Notes

Acknowledgements

This study received the financial and scientific support of INSU (Institut National des Sciences de l’Univers) and two funded EC-projects (Geomound and Ecomound). DB thanks Tjeerd van Weering (NIOZ) for providing the Lophelia pertusa sample and environment parameters data and Candace Major for a detailed review of the manuscript. CRB thanks Edouard Bard (Cerege) for providing the Porites lutea sample and Laurie Reisberg for correcting the English. CRB also thanks Marc Chaussidon and Christian France-Lanord (CRPG) for sharing their extensive experience in stable isotopes and ion microprobe with us. This paper benefited from the constructive comments by Dr. P. Swart and three anonymous reviewers. This is CRPG contribution 1663.

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Copyright information

© Springer-Verlag 2003

Authors and Affiliations

  • C. Rollion-Bard
    • 1
    Email author
  • D. Blamart
    • 2
  • J.-P. Cuif
    • 3
  • A. Juillet-Leclerc
    • 2
  1. 1. BP 20CRPG-CNRSVandoeuvre-lès-NancyFrance
  2. 2.Laboratoire des Sciences du Climat et de l’EnvironnementCEA-CNRSGif-sur-Yvette CédexFrance
  3. 3.Faculte des SciencesUniversite de Paris XI Orsay CedexFrance

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