The biogeochemical variability of Arctic thermokarst ponds is reflected by stochastic and niche‐driven microbial community assembly processes
| Autor: | Jakob Pernthaler, Gabriela Schaepman-Strub, Alizée Le Moigne, Maciej Bartosiewicz, Samuel Abiven |
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| Přispěvatelé: | University of Zurich, Pernthaler, Jakob |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Biogeochemical cycle
UFSP13-8 Global Change and Biodiversity Evolution Context (language use) Biology Microbiology Thermokarst 03 medical and health sciences 10126 Department of Plant and Microbial Biology Behavior and Systematics parasitic diseases Dissolved organic carbon 14. Life underwater 910 Geography & travel Ponds Research Articles Ecology Evolution Behavior and Systematics 030304 developmental biology Ecological niche 0303 health sciences geography geography.geographical_feature_category Bacteria Ecology Arctic Regions 030306 microbiology Microbiota fungi 2404 Microbiology Eukaryota Biodiversity Carbon Dioxide Tundra 10122 Institute of Geography 1105 Ecology Evolution Behavior and Systematics Microbial population biology Arctic 13. Climate action Methane Research Article |
| Zdroj: | Environmental Microbiology |
| DOI: | 10.5167/uzh-192134 |
| Popis: | Summary Shallow thermokarst ponds are a conspicuous landscape element of the Arctic Siberian tundra with high biogeochemical variability. Little is known about how microbes from the regional species pool assemble into local pond communities and how the resulting patterns affect functional properties such as dissolved organic carbon (DOC) remineralization and greenhouse gas (GHG) turnover. We analysed the pelagic microbiomes of 20 ponds in north‐eastern Siberia in the context of their physico‐chemical properties. Ponds were categorized as polygonal or trough according to their geomorphological origin. The diversity of bacteria and eukaryotic microbes was assessed by ribosomal gene tag sequencing. Null model analysis revealed an important role of stochastic assembly processes within ponds of identical origin, in particular for genotypes only occurring in few systems. Nevertheless, the two pond types clearly represented distinct niches for both the bacterial and eukaryotic microbial communities. Carbon dioxide concentration, indicative of heterotrophic microbial processes, varied greatly, especially in the trough ponds. Methane concentrations were lower in polygonal ponds and were correlated with the estimated abundance of methanotrophs. Thus, the overall functional variability of Arctic ponds reflects the stochastic assembly of their microbial communities. Distinct functional subcommunities can, nevertheless, be related to GHG concentrations. |
| Databáze: | OpenAIRE |
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