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Calcium isotope fractionation in modern scleractinian corals |
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| Authors: | Florian Bö hm,Nikolaus Gussone,Anton Eisenhauer,Sté phanie Reynaud |
| Affiliation: | a Leibniz-Institut für Meereswissenschaften, IFM-GEOMAR, Kiel, Germany b DFG Forschungszentrum Ozeanränder, Universität Bremen, Bremen, Germany c Centre Scientifique de Monaco, Monaco d Department of Geological and Environmental Sciences, Stanford University, Stanford, CA, USA |
| Abstract: | The 44Ca/40Ca ratios of cultured (Acropora sp.) and open ocean (Pavona clavus, Porites sp.) tropical reef corals are positively correlated with growth temperature. The slope of the temperature-fractionation relation is similar to inorganic aragonite precipitates. However, δ44/40Ca of the coral aragonite is offset from inorganic and sclerosponge aragonite by about +0.5‰. This offset can neither be explained by the very fast, biologically controlled calcification of scleractinian corals, nor as a consequence of calcification from a partly closed volume of fluid. As corals actively transport calcium through several cell layers to the site of calcification, the most likely explanation for the offset is a biologically induced fractionation. Our results indicate a limited use of Ca isotopes in scleractinian corals as temperature proxy. |
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