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| Altmann, D; Stief, P; Amann, R; De Beer, D; Schramm, A: In situ Distribution and Activity of Nitrifying Bacteria, Environmental Microbiology, 5, 798-803 (2003) | |
Abstract:
Nitrification was investigated in a model freshwater sediment by the combined use of microsensors and fluorescence in situ hybridization with rRNA-targeted oligonucleotide probes. In situ nitrification activity was restricted mainly to the upper 2 mm of the sediment and coincided with the maximum abundance of nitrifying bacteria, i.e. 1.5·10^7 cells cm-3 for ammonia-oxidizing Beta-proteobacteria (AOB) and 8.6·10^7 cells cm-3 for Nitrospira-like nitrite-oxidizing bacteria (NOB). Cell numbers of AOB decreased more rapidly with depth than numbers of NOB. For the first time, Nitrospira-like bacteria could be quantified and correlated with in situ nitrite oxidation rates in a sediment. Estimated cell-specific nitrite oxidation rates were 1.2-2.7 fmol NO2- cell-1 h-1.
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