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Unionids grow their shells incrementally. Thus, they potentially preserve ontogenetic history and ambient environmental conditions as seasonal variation in oxygen and stable carbon isotope compositions (8180 and 813C, respectively). This study combined geochemistry and sclerochronology to investigate whether Lampsilis cardium precipitated its shell in isotopic equilibrium with the ambient environment and if growth bands were deposited seasonally. To characterize ambient conditions, we measured temperature, 8180wATER, 813C of dissolved inorganic carbon (DIC), and pH biweekly from September 2002 to July 2004 in two Iowa rivers, Boone River (BR; agricultural watershed with C-4 plants: com) and Buffalo Creek (BC; urban watershed with C-3 plants: soybeans). These data were used to calculate predicted values of isotopic composition to compare to measured shell values. One hundred fifty-four individuals were marked at the postero-dorsal margin in September 2002 and June 2003. Seven recaptured shells collected in July 2004 were measured isotopically across three growth bands from the growing edge towards the umbo. 8180 sHELL corresponded to predicted values from early spring to early fall. Predicted winter values were not recorded, representing winter growth cessation. Rapid temperature change

Oxygen isotope composition of Lampsilis cardium from Boone River and Buffalo Creek in Iowa: implications for seasonal growth