Science Serving Maryland's Coasts

Brandy Smith, Savanna State University

Class Year: 

Project Title: 

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%.