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Title: Metal contaminations impact archaeal community composition, abundance and function in remote alpine lakes
Authors: Compte-Port, Sergi
Borrego, Carles M.
Moussard, Hélène
Jeanbille, Mathilde
Restrepo-Ortiz, Claudia Ximena
de Diego, Alberto
Rodriguez-Iruretagoiena, Azibar
Gredilla, Ainara
Fernández-Ortiz de Vallejuelo, Silvia
Galand, Pierre E.
Kalenitchenko, Dimitri
Rols, Jean-Luc
Pokrovsky, Oleg S.
Gonzalez, Aridane G. 
Camarero, Lluis
Muñiz, Selene
Navarro-Navarro, Enrique
Auguet, Jean-Christophe
UNESCO Clasification: 3308 Ingeniería y tecnología del medio ambiente
Keywords: Ammonia-Oxidizing Archaea
Mcra Gene
Methanogenic Archaea, et al
Issue Date: 2018
Publisher: 1462-2912
Journal: Environmental Microbiology 
Abstract: Using the 16S rRNA and mcrA genes, we investigated the composition, abundance and activity of sediment archaeal communities within 18 high-mountain lakes under contrasted metal levels from different origins (bedrock erosion, past-mining activities and atmospheric depositions). Bathyarchaeota, Euryarchaeota and Woesearchaeota were the major phyla found at the meta-community scale, representing 48%, 18.3% and 15.2% of the archaeal community respectively. Metals were equally important as physicochemical variables in explaining the assemblage of archaeal communities and their abundance. Methanogenesis appeared as a process of central importance in the carbon cycle within sediments of alpine lakes as indicated by the absolute abundance of methanogen 16S rRNA and mcrA gene transcripts (10(5) to 10(9) copies g(-1)). We showed that methanogen abundance and activity were significantly reduced with increasing concentrations of Pb and Cd, two indicators of airborne metal contaminations. Considering the ecological importance of methanogenesis in sediment habitats, these metal contaminations may have system wide implications even in remote area such as alpine lakes. Overall, this work was pioneer in integrating the effect of long-range atmospheric depositions on archaeal communities and indicated that metal contamination might significantly compromise the contribution of Archaea to the carbon cycling of the mountain lake sediments.
ISSN: 1462-2912
DOI: 10.1111/1462-2920.14252
Source: Environmental Microbiology [ISSN 1462-2912], v. 20 (7), p. 2422-2437
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