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Hydrobiological Journal
SJR: 0.227 SNIP: 0.575 CiteScore™: 0.24

ISSN Imprimir: 0018-8166
ISSN On-line: 1943-5991

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Hydrobiological Journal

DOI: 10.1615/HydrobJ.v48.i4.40
pages 53-65

Structure of Microbial Communities in the Zone of Emptying the Upper Angara River into Lake Baikal

S. Yu. Maksimenko
Federal State Budget Enterprise of Science Limnological Institute Siberian Department Russian Academy of Sciences Irkutsk, Russia
V. G. Ivanov
Federal State Budget Enterprise of Science Limnological Institute Siberian Department Russian Academy of Sciences Irkutsk, Russia
S. P. Buryukhayev
Federal State Budget Enterprise of Science Institute of General and Experimental Biology Siberian Department Russian Academy of Sciences Ulan-Ude, Russia
M. N. Shimarayev
Federal State Budget Enterprise of Science Limnological Institute Siberian Department Russian Academy of Sciences Irkutsk, Russia
T. I. Zemskaya
Federal State Budget Enterprise of Science Limnological Institute Siberian Department Russian Academy of Sciences Irkutsk, Russia

RESUMO

The structure of microbial communities was studied in the zone of emptying the Upper Angara River into Lake Baikal in 2006−2008. During the whole period of investigations, the maximum values of the total numbers of microorganisms and of the numbers of organotrophic bacteria were observed in the estuary of the river and at the distance of 3 km from it − 3.0 ± 0.1−7.5 ± 0.8 million cells/ml and 2100 CFU/ml, respectively. The peak of CO2 heterotrophic assimilation by bacteria (1.3 μg C/l·day) was also registered in this area. Correlation (r = 0.87) was established between the spatial distribution of microbiological parameters and water temperature. Changes in phylogenetic structure of microbial communities were revealed using the method of fluorescence in situ hybridization (FISH). Representatives of the phylogenetic groups Alphaproteobacteria, Actinobacteria, and Cytophaga-Flavobacteria dominated in the estuary of the river. Betaproteobacteria dominated at the distance of 3 km from it, whereas the contribution of Gammaproteobacteria and Planctomyces increased in the pelagic zone of the lake.