PMID- 19004348 OWN - NLM STAT- MEDLINE DCOM- 20081222 LR - 20131121 IS - 0026-3656 (Print) IS - 0026-3656 (Linking) VI - 77 IP - 5 DP - 2008 Sep-Oct TI - [Microbial community of the water column of the Selenga River-Lake Baikal biogeochemical barrier]. PG - 660-7 AB - The microbial communities of the estuarine zone and the mixing zone of river and lake waters in the Selenga River estuary were studied using the fluorescence in situ hybridization (FISH) method. The microorganisms belonging to the phylogenetic group Gammaproteobacteria were found to predominate in the river estuary, constituting up to 17% of the total bacterial community. Among cultivable microorganisms, organotrophic bacteria were predominant (2040 CFU/ml) in this zone, which results in high rates of microbial production (6.0 microg C/(1 day). The microbial community structure changed with distance from the river estuary; representatives of the Alpha-, Beta-, and Gammaproteobacteria were present in equal proportions; psychrotolerant and oligotrophic bacteria were numerous. The rate of heterotrophic carbon dioxide assimilation decreased to 3.8 microg C/(1 day). At 5-7 km from the river estuary, where the hydrologic, physical, and chemical conditions are similar to those of lake waters, members of the Betaproteobacteria, which are typical of the open waters of Lake Baikal, are the major representatives of planktonic microorganisms. FAU - Maksimenko, S Iu AU - Maksimenko SIu FAU - Zemskaia, T I AU - Zemskaia TI FAU - Pavlova, O N AU - Pavlova ON FAU - Ivanov, V G AU - Ivanov VG FAU - Buriukhaev, S P AU - Buriukhaev SP LA - rus PT - Comparative Study PT - English Abstract PT - Journal Article PT - Research Support, Non-U.S. Gov't PL - Russia (Federation) TA - Mikrobiologiia JT - Mikrobiologiia JID - 0376652 RN - 142M471B3J (Carbon Dioxide) SB - IM MH - Alphaproteobacteria/*classification/genetics/isolation & purification MH - Betaproteobacteria/*classification/genetics/isolation & purification MH - Carbon Dioxide/metabolism MH - Colony Count, Microbial MH - Gammaproteobacteria/*classification/genetics/isolation & purification MH - In Situ Hybridization, Fluorescence MH - Rivers/chemistry/*microbiology MH - Siberia MH - *Water Microbiology EDAT- 2008/11/14 09:00 MHDA- 2008/12/23 09:00 CRDT- 2008/11/14 09:00 PHST- 2008/11/14 09:00 [pubmed] PHST- 2008/12/23 09:00 [medline] PHST- 2008/11/14 09:00 [entrez] PST - ppublish SO - Mikrobiologiia. 2008 Sep-Oct;77(5):660-7.