Investigation of the sulfate-reducing bacterial community in the aerobic water and chemocline zone of the Black Sea by the fish technique |
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Authors: | A L Bryukhanov V A Korneeva T A Kanapatskii E E Zakharova E V Men’ko I I Rusanov N V Pimenov |
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Institution: | 1.Faculty of Biology,Lomonosov Moscow State University,Moscow,Russia;2.Winogradsky Institute of Microbiology,Russian Academy of Sciences,Moscow,Russia |
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Abstract: | Fluorescent in situ hybridization (FISH) was used to analyze the abundance and phylogenetic composition of sulfate-reducing
bacteria in the aerobic waters and in the oxic/anoxic transitional zone (chemocline) of the Black Sea, where biogenic formation
of reduced sulfur compounds was detected by radioisotope techniques. Numerous sulfate-reducing bacteria of the genera Desulfotomaculum (30.5% of detected bacterial cells), Desulfovibrio (29.6%), and Desulfobacter (6.7%) were revealed in the aerobic zone at a depth of 30 m, while Desulfomicrobium-related bacteria (33.5%) were prevalent in the upper chemocline waters at 150-m depth. Active cells of sulfate-reducing bacteria
were much more abundant in the samples collected in summer than in the winter samples from the deep-sea zone. The presence
of physiologically active sulfate reducers in oxic and chemocline waters of the Black Sea correlates with the hydrochemical
data on the presence of reduced sulfur compounds in the aerobic water column. |
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