Abrupt permafrost thaw triggers activity of copiotrophs and microbiome predators
Permanent lenke
https://hdl.handle.net/10037/31913Dato
2023-10-05Type
Journal articleTidsskriftartikkel
Peer reviewed
Forfatter
Scheel, Maria; Zervas, Athanasios; Rijkers, Ruud; Tveit, Alexander Tøsdal; Ekelund, Flemming; Campuzano Jiménez, Francisco; Christensen, Torben R.; Jacobsen, Carsten S.Sammendrag
Permafrost soils store a substantial part of the global soil carbon and nitrogen. However, global warming causes abrupt erosion and
gradual thaw, which make these stocks vulnerable to microbial decomposition into greenhouse gases. Here, we investigated the microbial response to abrupt in situ permafrost thaw. We sequenced the total RNA of a 1 m deep soil core consisting of up to 26 500-year-old
permafrost material from an active abrupt erosion site. We analysed the microbial community in the active layer soil, the recently
thawed, and the intact permafrost, and found maximum RNA:DNA ratios in recently thawed permafrost indicating a high microbial
activity. In thawed permafrost, potentially copiotrophic Burkholderiales and Sphingobacteriales, but also microbiome predators dominated the community. Overall, both thaw-dependent and long-term soil properties significantly correlated with changes in community composition, as did microbiome predator abundance. Bacterial predators were dominated in shallower depths by Myxococcota,
while protozoa, especially Cercozoa and Ciliophora, almost tripled in relative abundance in thawed layers. Our findings highlight the
ecological importance of a diverse interkingdom and active microbial community highly abundant in abruptly thawing permafrost,
as well as predation as potential biological control mechanism.
Forlag
Oxford University PressSitering
Scheel, Zervas, Rijkers, Tveit, Ekelund, Campuzano Jiménez, Christensen, Jacobsen. Abrupt permafrost thaw triggers activity of copiotrophs and microbiome predators. FEMS Microbiology Ecology. 2023;99(11)Metadata
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