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The transition from stochastic to deterministic bacterial community assembly during permafrost thaw succession

Doherty, Stacey Jarvis and Barbato, Robyn A. and Grandy, A. Stuart and Thomas, W. Kelley and Monteux, Sylvain and Dorrepaal, Ellen and Johansson, Margareta and Ernakovich, Jessica G. (2020). The transition from stochastic to deterministic bacterial community assembly during permafrost thaw succession. Frontiers in Microbiology. 11 , 596589
[Research article]

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Abstract

The Northern high latitudes are warming twice as fast as the global average, and
permafrost has become vulnerable to thaw. Changes to the environment during
thaw leads to shifts in microbial communities and their associated functions, such
as greenhouse gas emissions. Understanding the ecological processes that structure
the identity and abundance (i.e., assembly) of pre- and post-thaw communities may
improve predictions of the functional outcomes of permafrost thaw. We characterized
microbial community assembly during permafrost thaw using in situ observations
and a laboratory incubation of soils from the Storflaket Mire in Abisko, Sweden,
where permafrost thaw has occurred over the past decade. In situ observations
indicated that bacterial community assembly was driven by randomness (i.e., stochastic
processes) immediately after thaw with drift and dispersal limitation being the
dominant processes. As post-thaw succession progressed, environmentally driven
(i.e., deterministic) processes became increasingly important in structuring microbial
communities where homogenizing selection was the only process structuring upper
active layer soils. Furthermore, laboratory-induced thaw reflected assembly dynamics
immediately after thaw indicated by an increase in drift, but did not capture the longterm
effects of permafrost thaw on microbial community dynamics. Our results did
not reflect a link between assembly dynamics and carbon emissions, likely because
respiration is the product of many processes in microbial communities. Identification
of dominant microbial community assembly processes has the potential to improve
our understanding of the ecological impact of permafrost thaw and the permafrost–
climate feedback.

Authors/Creators:Doherty, Stacey Jarvis and Barbato, Robyn A. and Grandy, A. Stuart and Thomas, W. Kelley and Monteux, Sylvain and Dorrepaal, Ellen and Johansson, Margareta and Ernakovich, Jessica G.
Title:The transition from stochastic to deterministic bacterial community assembly during permafrost thaw succession
Series Name/Journal:Frontiers in Microbiology
Year of publishing :2020
Volume:11
Article number:596589
Number of Pages:17
ISSN:1664-302X
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Microbiology (Microbiology in the medical area to be 30109)
(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:permafrost thaw, microbial community, community assembly, phylogenetic null modeling, ecological processes
URN:NBN:urn:nbn:se:slu:epsilon-p-108965
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-108965
Additional ID:
Type of IDID
DOI10.3389/fmicb.2020.596589
ID Code:19132
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: SLUpub Connector
Deposited On:09 Dec 2020 07:03
Metadata Last Modified:15 Jan 2021 19:20

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