Abstract:
:The distribution of nitrifying bacteria of the genera Nitrosomonas, Nitrosospira, Nitrobacter and Nitrospira was investigated in a membrane-bound biofilm system with opposed supply of oxygen and ammonium. Gradients of oxygen, pH, nitrite and nitrate were determined by means of microsensors while the nitrifying populations along these gradients were identified and quantified using fluorescence in situ hybridization (FISH) in combination with confocal laser scanning microscopy. The oxic part of the biofilm which was subjected to high ammonium and nitrite concentrations was dominated by Nitrosomonas europaea-like ammonia oxidizers and by members of the genus Nitrobacter. Cell numbers of Nitrosospira sp. were 1-2 orders of magnitude lower than those of N. europaea. Nitrospira sp. were virtually absent in this part of the biofilm, whereas they were most abundant at the oxic-anoxic interface. In the totally anoxic part of the biofilm, cell numbers of all nitrifiers were relatively low. These observations support the hypothesis that N. europaea and Nitrobacter sp. can out-compete Nitrosospira and Nitrospira spp. at high substrate and oxygen concentrations. Additionally, they suggest microaerophilic behaviour of yet uncultured Nitrospira sp. as a factor of its environmental competitiveness.
journal_name
Environ Microbioljournal_title
Environmental microbiologyauthors
Schramm A,De Beer D,Gieseke A,Amann Rdoi
10.1046/j.1462-2920.2000.00150.xkeywords:
subject
Has Abstractpub_date
2000-12-01 00:00:00pages
680-6issue
6eissn
1462-2912issn
1462-2920journal_volume
2pub_type
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