Microbiological analysis of cryopegs from the Varandei Peninsula,Barents Sea |
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| Authors: | S A Pecheritsyna V A Shcherbakova A L Kholodov V N Akimov T N Abashina N E Suzina E M Rivkina |
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| Institution: | (1) Pushchino State University, Pushchino, Moscow oblast, 142290, Russia;(2) Skryabin Institute of Biochemistry and Physiology of Microorganisms, Russian Academy of Sciences, pr. Nauki 5, Pushchino, Moscow oblast, 142290, Russia;(3) Institute of Physicochemical and Biological Problems of Soil Sciences, Russian Academy of Sciences, ul. Institutskaya 2, Pushchino, Moscow oblast, 142290, Russia |
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| Abstract: | 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 × 108 cells/ml. The population of cultivated aerobic heterotrophic bacteria was 3–4 × 107 cells/ml and the number of anaerobic heterotrophic bacteria varied from 102 to 105 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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| Keywords: | cryopegs permafrost psychrophilic bacteria sulfate-reducing bacteria Desulfovibrio sp Psychrobacter sp Pseudomonas sp |
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