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Carbon isotopes in mollusk shell carbonates

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Abstract

Mollusk shells contain many isotopic clues about calcification physiology and environmental conditions at the time of shell formation. In this review, we use both published and unpublished data to discuss carbon isotopes in both bivalve and gastropod shell carbonates. Land snails construct their shells mainly from respired CO2, and shell δ13C reflects the local mix of C3 and C4 plants consumed. Shell δ13C is typically >10‰ heavier than diet, probably because respiratory gas exchange discards CO2, and retains the isotopically heavier HCO3 −. Respired CO2 contributes less to the shells of aquatic mollusks, because CO2/O2 ratios are usually higher in water than in air, leading to more replacement of respired CO2 by environmental CO2. Fluid exchange with the environment also brings additional dissolved inorganic carbon (DIC) into the calcification site. Shell δ13C is typically a few ‰ lower than ambient DIC, and often decreases with age. Shell δ13C retains clues about processes such as ecosystem metabolism and estuarine mixing. Ca2+ ATPase-based models of calcification physiology developed for corals and algae likely apply to mollusks, too, but lower pH and carbonic anhydrase at the calcification site probably suppress kinetic isotope effects. Carbon isotopes in biogenic carbonates are clearly complex, but cautious interpretation can provide a wealth of information, especially after vital effects are better understood.

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  1. 2906 Norman Dr., Boise, ID, 83704, USA

    Ted A. McConnaughey

  2. Department of Earth Science and Geography, Vassar College, P.O. Box 475, Poughkeepsie, NY, 12604, USA

    David Paul Gillikin

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McConnaughey, T.A., Gillikin, D.P. Carbon isotopes in mollusk shell carbonates. Geo-Mar Lett 28, 287–299 (2008). https://doi.org/10.1007/s00367-008-0116-4

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