Abstract
Permafrost thaw can bring negative consequences in terms of ecosystems, resulting in permafrost collapse, waterlogging, thermokarst lake development, and species composition changes. Little is known about how permafrost thaw influences microbial community shifts and their activities. Here, we show that the dominant archaeal community shifts from Methanomicrobiales to Methanosarcinales in response to the permafrost thaw, and the increase in methane emission is found to be associated with the methanogenic archaea, which rapidly bloom with nearly tenfold increase in total number. The mcrA gene clone libraries analyses indicate that Methanocellales/Rice Cluster I was predominant both in the original permafrost and in the thawed permafrost. However, only species belonging to Methanosarcinales showed higher transcriptional activities in the thawed permafrost, indicating a shift of methanogens from hydrogenotrophic to partly acetoclastic methane-generating metabolic processes. In addition, data also show the soil texture and features change as a result of microbial reproduction and activity induced by this permafrost thaw. Those data indicate that microbial ecology under warming permafrost has potential impacts on ecosystem and methane emissions.
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Acknowledgements
The authors acknowledge James Hurley at the University of Colorado for making a critical reading and revision of this paper. This research was supported by Funds of Oil and Gas Survey, China Geological Survey (GZH201400308 and GZH201400306).
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Wei, S., Cui, H., Zhu, Y. et al. Shifts of methanogenic communities in response to permafrost thaw results in rising methane emissions and soil property changes. Extremophiles 22, 447–459 (2018). https://doi.org/10.1007/s00792-018-1007-x
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DOI: https://doi.org/10.1007/s00792-018-1007-x