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The rate of bacterial nitrate reduction measured directly .in sediments from a hypertrophic marine ecosystem (6.0 f 1.5 mm01 m-2 d-') was similar to the value calculated from a whole pond nutrient budget (7.7 f 0.3 mm01 m-' d-') during a phytoplankton crash period. Organic matter breakdown in the sediments represented the dominant source of ammonia-N to the system (16.09 mm01 m'.' d-l compared to 2.97 mm01 m-2 d.' directly from fish excretion and 0.28 mm01 m-2 d.' in the inflow). However most, if not all, of t h ~ s ammonia-N d ~ d not reach the water col~imn as shown by a total nutrient budget for the pond. It was intercepted by the benthic flora and used to support high levels of benthic productivity (246 mm01 0 m-2 d-'; 29.72 mm01 N m-2 d-l). The benthic productivity was calculated by correcting the total system gross production (determined by a total oxygen budget) for water column productivity measured by in situ Incubated light/dark bottles. It is suggested that benthic productivity by microand macroalgae may be important in a number of shallow water systems a s modifiers of the flux of ammonia-N from the sediment to the overlying waters.

marine ecology. progress series

Importance of benthic productivity in controlling the flux of dissolved inorganic nitrogen through the sediment-water interface in a hypertrophic marine ecosystem