Methane turnover and methanotrophic communities in arctic aquatic ecosystems of 
the Lena Delta, Northeast Siberia

Osudar, Roman; Liebner, Susanne; Alawi, Mashal; Yang, Sizhong; Bussmann, Ingeborg; Wagner, Dirk

doi:10.1093/femsec/fiw116

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Methane turnover and methanotrophic communities in arctic aquatic ecosystems of the Lena Delta, Northeast Siberia

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Osudar, Roman
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/persons/resource/sliebner

Liebner, Susanne
5.3 Geomicrobiology, 5.0 Geoarchives, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Alawi, Mashal
5.3 Geomicrobiology, 5.0 Geoarchives, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

/persons/resource/syang

Yang, Sizhong
5.3 Geomicrobiology, 5.0 Geoarchives, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

Bussmann, Ingeborg
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/persons/resource/dwagner

Wagner, Dirk
5.3 Geomicrobiology, 5.0 Geoarchives, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;

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Citation

Osudar, R., Liebner, S., Alawi, M., Yang, S., Bussmann, I., Wagner, D. (2016): Methane turnover and methanotrophic communities in arctic aquatic ecosystems of the Lena Delta, Northeast Siberia. - FEMS Microbiology Ecology, 92, 8, fiw116.
https://doi.org/10.1093/femsec/fiw116

Cite as: https://gfzpublic.gfz-potsdam.de/pubman/item/item_1529137

Abstract

Large amounts of organic carbon are stored in Arctic permafrost environments, and microbial activity can potentially mineralize this carbon into methane, a potent greenhouse gas. In this study, we assessed the methane budget, the bacterial methane oxidation (MOX) and the underlying environmental controls of arctic lake systems, which represent substantial sources of methane. Five lake systems located on Samoylov Island (Lena Delta, Siberia) and the connected river sites were analyzed using radiotracers to estimate the MOX rates, and molecular biology methods to characterize the abundance and the community composition of methane-oxidizing bacteria (MOB). In contrast to the river, the lake systems had high variation in the methane concentrations, the abundance and composition of the MOB communities, and consequently, the MOX rates. The highest methane concentrations and the highest MOX rates were detected in the lake outlets and in a lake complex in a flood plain area. Though, in all aquatic systems, we detected both, Type I and II MOB, in lake systems, we observed a higher diversity including MOB, typical of the soil environments. The inoculation of soil MOB into the aquatic systems, resulting from permafrost thawing, might be an additional factor controlling the MOB community composition and potentially methanotrophic capacity.