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 μl CH4/(dm3 day) and oxidized at rates of 0.005–1180 μl 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 μl CH4/(m2 day). Rates of bacterial methane oxidation in near-bottom water layers ranged from 0.002 to 1.78 μl/(l 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.
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Dagurova, O.P., Namsaraev, B.B., Kozyreva, L.P. et al. Bacterial Processes of the Methane Cycle in Bottom Sediments of Lake Baikal. Microbiology 73, 202–210 (2004). https://doi.org/10.1023/B:MICI.0000023990.71983.c1
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DOI: https://doi.org/10.1023/B:MICI.0000023990.71983.c1