Burgin, A.J. and S.K. Hamilton
Presented at the All Scientist Poster Reception (2006-05-09 )
The removal of nitrogen (N) by wetlands and streams is of particular interest because excessive nitrate is a growing water quality problem. Most research on N removal has focused on plant or microbial uptake (assimilation) or respiratory denitrification by bacteria. The increasing application of stable isotope and other tracer techniques to study N removal has yielded a growing body of evidence for other microbial processes that involve 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 importance of these novel N removal pathways in freshwaters, and consider how they might change our perspectives on N removal.
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