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Applied and Environmental Microbiology, September 2005, p. 5029-5037, Vol. 71, No. 9
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.9.5029-5037.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.

Bacterial Community Composition in Lake Tanganyika: Vertical and Horizontal Heterogeneity

Aaike De Wever,1* Koenraad Muylaert,1 Katleen Van der Gucht,1 Samuel Pirlot,2 Christine Cocquyt,1 Jean-Pierre Descy,2 Pierre-Denis Plisnier,2,3 and Wim Vyverman1

Ghent University, Department of Biology, Section of Protistology and Aquatic Ecology, Ghent, Belgium,1 University of Namur, Department of Biology, Laboratory of Freshwater Ecology, URBO, Namur, Belgium,2 Royal Museum for Central Africa, Tervuren, Belgium3

Received 6 December 2004/ Accepted 29 March 2005

Vertical and latitudinal differences in bacterial community composition (BCC) in Lake Tanganyika were studied during the dry season of 2002 by means of denaturing gradient gel electrophoresis analysis of PCR-amplified 16S RNA fragments. Dominant bands were sequenced and identified as members of the Cyanobacteria, Actinobacteria, Nitrospirae, green nonsulfur bacteria, and Firmicutes divisions and the Gamma- and Deltaproteobacteria subdivisions. The BCC in the lake displayed both vertical and latitudinal variation. Vertical changes in BCC were related to the thermal water column stratification, which influences oxygen and nutrient concentrations. Latitudinal variation was related to upwelling of deep water and increased primary production in the south of the lake. The number of bands per sample increased with bacterial production in the epilimnion of the lake, suggesting a positive diversity-productivity relationship.

* Corresponding author. Mailing address: Ghent University, Department Biology, Section Protistology and Aquatic Ecology, 9000 Ghent, Belgium. Phone: 32 (0)9 264 85 05. Fax: 32 (0)9 264 85 99. E-mail: Aaike.DeWever{at}UGent.be.

Applied and Environmental Microbiology, September 2005, p. 5029-5037, Vol. 71, No. 9
0099-2240/05/$08.00+0     doi:10.1128/AEM.71.9.5029-5037.2005
Copyright © 2005, American Society for Microbiology. All Rights Reserved.



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