title: [Bacterial processes of the methane cycle in the bottom sediments of Baikal lake].
abstract: The activity of methanogenic and methanotrophic bacteria was evaluated in bottom sediments of Lake Baikal. Methane concentration in Baikal bottom sediments varied from 0.0053 to 81.7 ml/dm3. Bacterial methane was produced at rates of 0.0004-534.7 microliters CH4/(dm3 day) and oxidized at rates of 0.005-1180 microliters CH4/(dm3 day). Peak methane production and oxidation were observed in Frolikha Bay near a methane vent. Methane was emitted into water at rates of 49.2-4340 microliters CH4/(m2 day). Rates of bacterial methane oxidation in near-bottom water layers ranged from 0.002 to 1.78 microliters/(1 day). Methanogens and methanotrophs were found to play an important role in the carbon cycle through all layers of sediments, particularly in the areas of methane vent and gas-hydrate occurrence.
authors.affiliation: Institute of General and Experimental Biology, Siberian Division, Russian Academy of Sciences, ul. Sakh'yanovoi 6, Ulan-Ude, 670047 Russia. dagurova@biol.bsc.buryatia.ru
authors.forename: O P
authors.initials: OP
authors.lastname: Dagurova
authors.forename: B B
authors.initials: BB
authors.lastname: Namsaraev
authors.forename: L P
authors.initials: LP
authors.lastname: Kozyreva
authors.forename: T I
authors.initials: TI
authors.lastname: Zemskaia
authors.forename: L E
authors.initials: LE
authors.lastname: Dulov
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D005618:Fresh Water / Q000032:analysis / Q000382:microbiology*; D019015:Geologic Sediments / Q000032:analysis / Q000382:microbiology*; D008697:Methane / Q000032:analysis / Q000378:metabolism*; D010084:Oxidation-Reduction; D012426:Russia; D012988:Soil Microbiology
chemical_list: D008697:Methane