Composition of Bacterial and Archaeal Communities in Freshwater Sediments with Different Contamination Levels (Lake Geneva, Switzerland)
water research 45 (2011) 1213e1228 Available at www.sciencedirect.com journal homepage: www.elsevier.com/locate/watres Composition of bacterial and archaeal communities in freshwater sediments with different contamination levels (Lake Geneva, Switzerland) Laurence Haller a, Mauro Tonolla b,d, Jakob Zopfi c, Raffaele Peduzzi b, Walter Wildi a, John Pote´ a,* a University of Geneva, Institute F.A. Forel, 10 route de Suisse, CP 416, CH-1290 Versoix, Switzerland b Microbial Ecology, Microbiology Unit, Plant Biology Department, University of Geneva, 30, Quai Ernest-Ansermet, CH-1211 Geneva, Switzerland c University of Lausanne, Institute of Geology and Paleontology, Laboratory of Biogeosciences, CH-1015 Lausanne, Switzerland d Cantonal Institute of Microbiology, Via Mirasole 22A, CH-6500 Bellinzona, Switzerland article info abstract Article history: The aim of this study was to compare the composition of bacterial and archaeal Received 31 August 2010 communities in contaminated sediments (Vidy Bay) with uncontaminated sediments Received in revised form (Ouchy area) of Lake Geneva using 16S rRNA clone libraries. Sediments of both sites were 8 November 2010 analysed for physicochemical characteristics including porewater composition, organic Accepted 14 November 2010 carbon, and heavy metals. Results show high concentrations of contaminants in sediments Available online 20 November 2010 from Vidy. Particularly, high contents of fresh organic matter and nutrients led to intense mineralisation, which was dominated by sulphate-reduction and methanogenesis. The Keywords: bacterial diversity in Vidy sediments was significantly different from the communities in Lake Geneva the uncontaminated sediments. Phylogenetic analysis revealed a large proportion of Sediment pollution Betaproteobacteria clones in Vidy sediments related to Dechloromonas sp., a group of dech- Heavy metal lorinating and contaminant degrading bacteria.
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