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Sediment with different densities of Corophium volutator (Pallas), ranging from 0 to 19 800 ind. m-', were incubated in laboratory microcosms, and rates of oxygen uptake, denitnfication and nitrate ammonification were determined from sediment-water fluxes. The measured processes were stimulated differently by C. volutator; oxygen uptake, denitrification of NO, from nitnfication within the sediment, and denitrification of NOT from the overlying water were enhanced 2-, 3and 5-fold respectively in the presence of 19 800 ind. m-?. This differential stimulation was explained by the different characteristics of diffusional solute transport at the sediment-water interface and mass transfer of water into the burrows where O2 and NO? was depleted. Denitrification rates were calculated by using the lSN isotope pairing technique. The applicability of the ' 5 ~ isotope pairing technique for measunng coupled nitrification-denitrification in bioturbated sedlment was confirmed in a test incubation with different levels of 1 5 ~ 0 < added to microcosms with 12 000 C. volutatorind. m-'

Denitrification in estuarine sediment stimulated by the irrigation activity of the amphipod Corophium volutator