Abstract
Carbon and oxygen isotope analyses on shells of freshwater molluscs and their habitat are presented. The data obtained reconfirm the usefulness of such 18O analyses for paleoenvironmental and paleohydrological studies. The 13C analyses on freshwater molluscs from lakes in southwestern Ontario, specimens grown under laboratory conditions and a comparison with the 13C contents of the dissolved inorganic carbon in their habitat show that the 13C contents in mollusc shells are primarily controlled by the aqueous carbonate species. Vital effects and food control appear to have only minor importance. The significance of this observation on the usufulness of mollusc shells for 14C dating is discussed.
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