Microbiological analysis of cryopegs from the Varandei Peninsula, Barents Sea

TitleMicrobiological analysis of cryopegs from the Varandei Peninsula, Barents Sea
Publication TypeJournal Article
Year of Publication2007
AuthorsPecheritsyna, SA, Shcherbakova, VA, Kholodov, AL, Akimov, VN, Abashina, TN, Suzina, NE, Rivkina, EM
Date PublishedOct
ISBN Number0026-2617
Keywordsbacteria, cryopegs, desulfovibrio sp, Permafrost, pseudomonas sp, psychrobacter sp, psychrophilic bacteria, siberian permafrost, sp-nov, sulfate-reducing bacteria

The paper deals with the microbiological characterization of water-saturated horizons in permafrost soils (cryopegs) found on the Varandei Peninsula (Barents Sea coast), 4-20 m deep. The total quantity of bacteria in the water of cryopegs was 3.5 x 10(8) cells/ml. The population of cultivated aerobic heterotrophic bacteria was 3-4 x 10(7) cells/ml and the number of anaerobic heterotrophic bacteria varied from 10(2) to 10(5) cells/ml depending on cultivation temperature and salinity. Sulfate-reducing bacteria and methanogenic archaea were found as hundreds and tens of cells per ml of water, respectively. A pure culture of a sulfate-reducing strain B15 was isolated from borehole 21 and characterized. Phylogenetic analysis has shown that the new bacterium is a member of the genus Desulfovibrio with Desulfovibrio mexicanus as its closest relative (96.5% similarity). However, the significant phenotypic differences suggest that strain B15 is a new species of sulfate-reducing bacteria.

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