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Microbial network, phylogenetic diversity and community membership in the active layer across a permafrost thaw gradient

Mondav, Rhiannon LU orcid ; McCalley, Carmody K. ; Hodgkins, Suzanne B. ; Frolking, Steve ; Saleska, Scott R. ; Rich, Virginia I. ; Chanton, Jeff P. and Crill, Patrick (2017) In Environmental Microbiology 19(8). p.3201-3218
Abstract

Biogenic production and release of methane (CH4) from thawing permafrost has the potential to be a strong source of radiative forcing. We investigated changes in the active layer microbial community of three sites representative of distinct permafrost thaw stages at a palsa mire in northern Sweden. The palsa site (intact permafrost and low radiative forcing signature) had a phylogenetically clustered community dominated by Acidobacteria and Proteobacteria. The bog (thawing permafrost and low radiative forcing signature) had lower alpha diversity and midrange phylogenetic clustering, characteristic of ecosystem disturbance affecting habitat filtering. Hydrogenotrophic methanogens and Acidobacteria dominated the bog shifting... (More)

Biogenic production and release of methane (CH4) from thawing permafrost has the potential to be a strong source of radiative forcing. We investigated changes in the active layer microbial community of three sites representative of distinct permafrost thaw stages at a palsa mire in northern Sweden. The palsa site (intact permafrost and low radiative forcing signature) had a phylogenetically clustered community dominated by Acidobacteria and Proteobacteria. The bog (thawing permafrost and low radiative forcing signature) had lower alpha diversity and midrange phylogenetic clustering, characteristic of ecosystem disturbance affecting habitat filtering. Hydrogenotrophic methanogens and Acidobacteria dominated the bog shifting from palsa-like to fen-like at the waterline. The fen (no underlying permafrost, high radiative forcing signature) had the highest alpha, beta and phylogenetic diversity, was dominated by Proteobacteria and Euryarchaeota and was significantly enriched in methanogens. The Mire microbial network was modular with module cores consisting of clusters of Acidobacteria, Euryarchaeota or Xanthomonodales. Loss of underlying permafrost with associated hydrological shifts correlated to changes in microbial composition, alpha, beta and phylogenetic diversity associated with a higher radiative forcing signature. These results support the complex role of microbial interactions in mediating carbon budget changes and climate feedback in response to climate forcing.

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author
; ; ; ; ; ; and
publishing date
type
Contribution to journal
publication status
published
subject
in
Environmental Microbiology
volume
19
issue
8
pages
3201 - 3218
publisher
Wiley-Blackwell
external identifiers
  • pmid:28574203
  • scopus:85023610895
ISSN
1462-2912
DOI
10.1111/1462-2920.13809
language
English
LU publication?
no
additional info
Funding Information: The authors thank Andrew C. Barnes, Brian Lanoil, and James Prosser for critical comments on a previous version of the manuscript. The authors sincerely thank the two anonymous reviewers who helped to greatly improve this manuscript. RM was supported by an Australian Postgraduate Award Scholarship from the Australian Research Council and a Swedish Vetenskapsrådet grant. JPC, PMC, SF, SH, CKM, SRS and VIR were supported by the US Department of Energy, Office of Biological and Environmental Research under the Genomic Science program (Award DE-SC0004632). Publisher Copyright: © 2017 Society for Applied Microbiology and John Wiley & Sons Ltd
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51d73289-51d2-4fe7-884c-e82761640cc5
date added to LUP
2023-06-05 15:39:55
date last changed
2024-06-15 03:45:39
@article{51d73289-51d2-4fe7-884c-e82761640cc5,
  abstract     = {{<p>Biogenic production and release of methane (CH<sub>4</sub>) from thawing permafrost has the potential to be a strong source of radiative forcing. We investigated changes in the active layer microbial community of three sites representative of distinct permafrost thaw stages at a palsa mire in northern Sweden. The palsa site (intact permafrost and low radiative forcing signature) had a phylogenetically clustered community dominated by Acidobacteria and Proteobacteria. The bog (thawing permafrost and low radiative forcing signature) had lower alpha diversity and midrange phylogenetic clustering, characteristic of ecosystem disturbance affecting habitat filtering. Hydrogenotrophic methanogens and Acidobacteria dominated the bog shifting from palsa-like to fen-like at the waterline. The fen (no underlying permafrost, high radiative forcing signature) had the highest alpha, beta and phylogenetic diversity, was dominated by Proteobacteria and Euryarchaeota and was significantly enriched in methanogens. The Mire microbial network was modular with module cores consisting of clusters of Acidobacteria, Euryarchaeota or Xanthomonodales. Loss of underlying permafrost with associated hydrological shifts correlated to changes in microbial composition, alpha, beta and phylogenetic diversity associated with a higher radiative forcing signature. These results support the complex role of microbial interactions in mediating carbon budget changes and climate feedback in response to climate forcing.</p>}},
  author       = {{Mondav, Rhiannon and McCalley, Carmody K. and Hodgkins, Suzanne B. and Frolking, Steve and Saleska, Scott R. and Rich, Virginia I. and Chanton, Jeff P. and Crill, Patrick}},
  issn         = {{1462-2912}},
  language     = {{eng}},
  number       = {{8}},
  pages        = {{3201--3218}},
  publisher    = {{Wiley-Blackwell}},
  series       = {{Environmental Microbiology}},
  title        = {{Microbial network, phylogenetic diversity and community membership in the active layer across a permafrost thaw gradient}},
  url          = {{http://dx.doi.org/10.1111/1462-2920.13809}},
  doi          = {{10.1111/1462-2920.13809}},
  volume       = {{19}},
  year         = {{2017}},
}