Science Serving Maryland's Coasts
Jeffrey Cornwell, Ph.D.
Horn Point Laboratory
Dynamics of N2 and CH4 in Choptank River Marsh Creeks
Intact sediment cores with different densities (0, 3100, and 18,640 ind.m-2) of the amphipod Leptocherius plumulosus, were incubated in laboratory microcosms. Denitrification and oxygen concentrations were determined from sediment-water fluxes using a Dissolved Gas Analyzer, an instrument that directly measures N2 (and O2 rates). Average rates of coupled nitrification/denitrification in bioturbated cores increased by 50 and 100%, respectively, while O2 consumption rates increased by 38 and 100%.
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