Burgin, A.J. and S.K. Hamilton
Presented at the All Scientist Poster Reception (2006-05-09 )
The removal of nitrogen (N) by wetlands andstreams is of particular interest because excessive nitrate is agrowing water quality problem. Most research on N removal hasfocused on plant or microbial uptake (assimilation) or respiratorydenitrification by bacteria. The increasing application of stableisotope and other tracer techniques to study N removal has yieldeda growing body of evidence for other microbial processes thatinvolve the dissimilatory reduction of nitrate to ammonium (DNRA)or the chemoautotrophic denitrification of nitrate to dinitrogen.In this talk, we present evidence for the existence and importanceof these novel N removal pathways in freshwaters, and consider howthey might change our perspectives on N removal.
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