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The biogeochemical variability of Arctic thermokarst ponds is reflected by stochastic and niche-driven microbial community assembly processes

Le Moigne, Alizée and Bartosiewicz, Maciej and Schaepman-Strub, Gabriela and Abiven, Samuel and Pernthaler, Jakob. (2020) The biogeochemical variability of Arctic thermokarst ponds is reflected by stochastic and niche-driven microbial community assembly processes. Environmental Microbiology, 22 (11). pp. 4847-4862.

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Official URL: https://edoc.unibas.ch/80383/

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Abstract

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.
Faculties and Departments:05 Faculty of Science
UniBasel Contributors:Bartosiewicz, Maciej
Item Type:Article, refereed
Article Subtype:Research Article
Publisher:Wiley
ISSN:1462-2912
e-ISSN:1462-2920
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:14 Apr 2021 11:57
Deposited On:14 Apr 2021 11:57

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