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The Permafrost/Active Layer Microbial Community in the Eravna Bazin (Buryatia, Russia)
by Svetlana Zaitseva | Ludmila Kozyreva | Nimazhap Badmaev | Institute of General and Experimental Biology SD RAS | Institute of General and Experimental Biology SD RAS | Institute of General and Experimental Biology SD RAS
Abstract ID: 351
Event: BGRS-abstracts
Sections: [Sym 8] Section “Microbial communities of natural and anthropogenic habitats”

We investigated changes in the permafrost/active layer microbial community of three sites representative of distinct permafrost thaw stages in the south of the Vitim Plateau. A comprehensive analysis revealed site- and horizon-specific patterns of the microbial distribution at the seasonally thawing permafrost soils. High level of microbial diversity in all soil horizons of active layer during the maximum thawing and in intact permafrost was found. Actinobacteriota have been identified as one of the most obvious indicator taxa of permafrost horizons. Proteobacteria increased toward permafrost depths is mainly due to members of the copiotrophic family Comamonadaceae, which has previously been found to be a member of an ancient permafrost community. Bacteroidetes were found in significant abundance and even dominated the composition of the microbial community of the permafrost layer. In comparison, oligotrophic Acidobacteria may be better adapted to the thermally altered active layer due to their higher stress tolerance.

 

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