Journal
MICROBIOLOGY
Volume 90, Issue 2, Pages 261-267Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0026261721020065
Keywords
permafrost; thermokarst lakes; methane; methanogenesis; methane oxidation
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Funding
- Russian Science Foundation [16-14-10201]
- RF Ministry of Science and Higher Education (State Assignment of the Biotechnology Center, Russian Academy of Sciences)
- Russian Center for Arctic Exploration
- Russian Science Foundation [16-14-10201] Funding Source: Russian Science Foundation
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The study found that the hydrogenotrophic pathway dominated in thermokarst lakes, while the acetoclastic pathway was more abundant in polygenetic lakes with higher dissolved organic matter content.
Comparative study of methanogen diversity and potential activity of different methanogenic pathways in the sediments of young thermokarst and mature polygenetic Yamal lakes was carried out. The hydrogenotrophic pathway of methanogenesis played an important role in methane formation in thermokarst lakes. The acetoclastic and methylotrophic pathways were also revealed there. In a polygenetic lake with a dissolved organic matter content closest to that of the thermokarst lakes, methanogenesis proceeded more intensively, and the relative abundance of methanogens, especially acetoclastic ones, was higher than in thermokarst lakes. The activity of methyl-reducing methanogens was also assumed there. Methanogens of the genera Methanothrix and Methanoregula, as well as representatives of the family Methanomassiliicoccaceae were identified in the sediments of all lakes. Methane-oxidizing bacteria (Methylobacter, Candidatus Methylomirabilis) and archaea (Ca. Methanoperedens) were also detected.
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