SrCaand 13C12Cratios in skeletal calcite of Mytilus trossulus:Covariation with metabolic rate, salinity, and carbon isotopic composition of seawater

Minor element and isotopic compositions of marine bivalve calcite are frequently used as proxy records of seawater temperature and salinity. Although molluscan calcite is secreted at or near oxygen isotope equilibrium, the influence of metabolic activity (i.e., vital effects) on skeletal SrCaratios and δ 13C values is not well known. We present measurements of skeletal chemistry from (a) consecutive samples milled in chronological order from the organism's final year of growth and (b) adjacent samples within three separate growth bands of the marine mussel Mytilus trossulusto investigate chemical disequilibrium effects among different parts of the shell.