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Osudar, Roman; Liebner, Susanne; Alawi, Mashal; Yang, Sizhong; Bussmann, Ingeborg; Wagner, Dirk (2016): (Table 1) Methane concentrations, MOX rates and MOB abundance in arctic aquatic ecosystems of the Lena Delta, Northeast Siberia. PANGAEA,, Supplement to: Osudar, R et al. (2016): Methane turnover and methanotrophic communities in arctic aquatic ecosystems of the Lena Delta, Northeast Siberia. FEMS Microbiology Ecology, fiw116,

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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 floodplain 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.
Median Latitude: 72.377787 * Median Longitude: 126.501583 * South-bound Latitude: 72.366800 * West-bound Longitude: 126.469700 * North-bound Latitude: 72.391600 * East-bound Longitude: 126.526500
Date/Time Start: 2012-07-20T00:00:00 * Date/Time End: 2012-07-20T00:00:00
Minimum DEPTH, water: m * Maximum DEPTH, water: m
Samoylov_Island * Latitude: 72.376480 * Longitude: 126.489230 * Elevation: 8.0 m * Location: Samoylov Island, Lena Delta, Siberia * Device: Multiple investigations (MULT)
#NameShort NameUnitPrincipal InvestigatorMethodComment
1LakeLakeWagner, Dirk
2CommentCommentWagner, DirkComplex constituents
3DATE/TIMEDate/TimeWagner, DirkGeocode
4LATITUDELatitudeWagner, DirkGeocode
5LONGITUDELongitudeWagner, DirkGeocode
6DEPTH, waterDepth watermWagner, DirkGeocode
7AreaAream2Wagner, DirkWater surface area of lake
8Record lengthLengthmWagner, Dirkof outlet
9Depth, bathymetricBathy depthmWagner, Dirk
10MethaneCH4nmol/lWagner, Dirk
11Methane, standard deviationCH4 std dev±Wagner, Dirk
12Methane oxidation rateMOXnmol/l/hWagner, Dirk
13Methane oxidation rate, standard deviationMOX std dev±Wagner, Dirk
14Bacteria, methane oxidizing, abundanceMOB#/mlWagner, Dirk
15Bacteria, methane oxidizing, abundance, standard deviationMOB std dev±Wagner, Dirk
16Temperature, waterTemp°CWagner, Dirk
17SalinitySalWagner, Dirk
18OxygenO2µmol/lWagner, Dirk
19Suspended matterSPMmg/lWagner, Dirk
297 data points

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