Microbiological analysis of cryopegs from the Varandei Peninsula, Barents Sea
|Title||Microbiological analysis of cryopegs from the Varandei Peninsula, Barents Sea|
|Publication Type||Journal Article|
|Year of Publication||2007|
|Authors||Pecheritsyna, SA, Shcherbakova, VA, Kholodov, AL, Akimov, VN, Abashina, TN, Suzina, NE, Rivkina, EM|
|Keywords||bacteria, 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.
|URL||<Go to ISI>://000250240000015|