Abstract
In PNAS, Leavitt et al. (1) describe the shared dependence of cell-specific sulfate reduction rate and sulfur isotope fractionations on the availability of a single electron donor for the model sulfate reducer, Desulfovibrio vulgaris Hildenborough. These authors then use their findings in a unique way to calibrate past sedimentary sulfate reduction rates (SedSRR) using sulfur isotope data from sedimentary pyrite and sulfate. This approach reveals evidence for changes in SedSRR over the past 200 million years that played a critical role in determining sulfur isotope fractionations in marine sediments.
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