Abstract
Cultivation and molecular approaches were used to study methanogenesis in saline aquatic system of the Lake Elton (southern Russia), the largest hypersaline lake in Europe. The potential rates of hydrogenotrophic, acetoclastic, methylotrophic and methyl-reducing methanogenesis and diversity of the growth-enriched for by adding electron donors methanogenic communities were studied in the sediment slurry incubations at salinity range from 7 to 275 g/L. The most active pathway detected at all salinities was methylotrophic with a dominance of Methanohalobium and Methanohalophilus genera, at salt saturation and moderately halophilic Methanolobus and Methanococcoides at lower salinity. The absence of methane production from acetate, formate and H2/CO2 under hypersaline conditions was most probably associated with the energy constraints. The contribution of hydrogenotrophic, acetoclastic, and methyl-reducing methanogens to the community increases with a decrease in salinity. Temperature might play an important regulatory function in hypersaline habitats; i.e. methylotrophic methanogens and hydrogenotrophic sulfate-reducing bacteria (SRB) outcompeting methyl-reducing methanogens under mesophilic conditions, and vice versa under thermophilic conditions. An active methane production together with negligible methane oxidation makes hypersaline environments a potential source of methane emission.
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Acknowledgements
The authors are very grateful to D. Sorokin (Winogradsky Institute of Microbiology) for his valuable comments and manuscript correction. Authors are grateful to E. Zakharova and I. Rusanov (Winogradsky Institute of Microbiology) for their help with radioisotope measurements. Biogeochemical and cultivation experiments were supported by the Ministry of Science and Higher Education of the Russian Federation (goszadanie). Molecular biological research was supported by the Russian Science Foundation (Grant Number 17-74-30025).
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Kallistova, A., Merkel, A., Kanapatskiy, T. et al. Methanogenesis in the Lake Elton saline aquatic system. Extremophiles 24, 657–672 (2020). https://doi.org/10.1007/s00792-020-01185-x
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DOI: https://doi.org/10.1007/s00792-020-01185-x