Journal
ENVIRONMENTAL MICROBIOLOGY
Volume 5, Issue 9, Pages 798-803Publisher
WILEY
DOI: 10.1046/j.1469-2920.2003.00469.x
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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. 1.5x10(7) cells cm(-3) for ammonia-oxidizing Beta-proteobacteria (AOB) and 8.6x10(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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