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Habitat partitioning of denitrifying bacterial communities carrying nirS or nirK genes in the stratified water column of Lake Kinneret, Israel

MPG-Autoren
http://pubman.mpdl.mpg.de/cone/persons/resource/persons61277

Junier,  Pilar
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons56764

Kim,  Ok-Sun
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons57008

Witzel,  Karl-Paul
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons56705

Hadas,  Ora
Department Ecophysiology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Zitation

Junier, P., Kim, O.-S., Witzel, K.-P., Imhoff, J. F., & Hadas, O. (2008). Habitat partitioning of denitrifying bacterial communities carrying nirS or nirK genes in the stratified water column of Lake Kinneret, Israel. Aquatic Microbial Ecology, 51(2), 129-140. doi:10.3354/ame01186.


Zitierlink: http://hdl.handle.net/11858/00-001M-0000-000F-D6A4-F
Zusammenfassung
The community composition of denitrifying bacteria was studied in the stratified water column of Lake Kinneret. The nitrite reductase genes nirS and nirK were amplified by PCR from water samples taken at 1, 14, 19 and 22 m depth, which represent the epi-, meta- and hypolimnion of the lake. The PCR products were analyzed with terminal restriction fragment length polymorphism (T-RFLP) and clone libraries. The highest diversity of nirS denitrifying communities was observed at 1 m depth. According to the T-RFLP profiles and clone libraries of nirS products, 2 groups of denitrifiers were common to and dominant in all depths. Deduced protein sequences from one of these groups displayed low identity (77 %) with other nirS sequences reported in GenBank. Denitrifying bacterial communities with nirK were most diverse at 22 m and showed highest similarity to those at 19 m depth. Sequences unrelated to nirK dominated the clone libraries from 1 m depth, suggesting that denitrifying bacteria with copper-containing nitrite reductase were less frequent at this depth. The results suggest that microorganisms with nirK and those with nirS respond differently to the environmental conditions in the stratified water column of Lake Kinneret.