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Temperatures beyond the community optimum promote the dominance of heat-adapted, fast growing and stress resistant bacteria in alpine soils

Donhauser, Johanna ; Niklaus, Pascal A. ; Rousk, Johannes LU ; Larose, Catherine and Frey, Beat (2020) In Soil Biology and Biochemistry 148.
Abstract

Alpine soils are warming strongly, leading to profound alterations in carbon cycling and greenhouse gas budgets, mediated via the soil microbiome. To explore microbial responses to global warming, we incubated eight alpine soils between 4 and 35 °C and linked the temperature dependency of bacterial growth with alterations in community structures and the identification of temperature sensitive taxa. The temperature optimum for bacterial growth was between 27 and 30 °C and was higher in soils from warmer environments. This temperature framing the upper limit of naturally occurring temperatures was a tipping point above which the temperature range for growth shifted towards higher temperatures together with pronounced changes in community... (More)

Alpine soils are warming strongly, leading to profound alterations in carbon cycling and greenhouse gas budgets, mediated via the soil microbiome. To explore microbial responses to global warming, we incubated eight alpine soils between 4 and 35 °C and linked the temperature dependency of bacterial growth with alterations in community structures and the identification of temperature sensitive taxa. The temperature optimum for bacterial growth was between 27 and 30 °C and was higher in soils from warmer environments. This temperature framing the upper limit of naturally occurring temperatures was a tipping point above which the temperature range for growth shifted towards higher temperatures together with pronounced changes in community structures and diversity based on both 16S rRNA gene and transcript sequencing. For instance, at the highest temperature, we observed a strong increase in OTUs affiliated with Burkholderia-Paraburkholderia, Phenylobacterium, Pseudolabrys, Edaphobacter and Sphingomonas. Dominance at high temperature was explained by a priori adaptation to high temperature, high growth potential as well as stress resistance. At the highest temperature, we moreover observed an overall increase in copiotrophic properties in the community along with high growth rates. Further, temperature effects on community structures depended on the long-term climatic legacy of the soils. These findings contribute to extrapolating from single to multiple sites across a large range of conditions.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Alpine, Bacterial growth rates, Global warming, Laboratory warming experiment, Microbiome, Temperature adaptation
in
Soil Biology and Biochemistry
volume
148
article number
107873
publisher
Elsevier
external identifiers
  • scopus:85088634163
ISSN
0038-0717
DOI
10.1016/j.soilbio.2020.107873
language
English
LU publication?
yes
id
f6081c02-23e7-4f82-828a-96136ff56de1
date added to LUP
2020-08-04 09:38:56
date last changed
2020-09-23 15:15:26
@article{f6081c02-23e7-4f82-828a-96136ff56de1,
  abstract     = {<p>Alpine soils are warming strongly, leading to profound alterations in carbon cycling and greenhouse gas budgets, mediated via the soil microbiome. To explore microbial responses to global warming, we incubated eight alpine soils between 4 and 35 °C and linked the temperature dependency of bacterial growth with alterations in community structures and the identification of temperature sensitive taxa. The temperature optimum for bacterial growth was between 27 and 30 °C and was higher in soils from warmer environments. This temperature framing the upper limit of naturally occurring temperatures was a tipping point above which the temperature range for growth shifted towards higher temperatures together with pronounced changes in community structures and diversity based on both 16S rRNA gene and transcript sequencing. For instance, at the highest temperature, we observed a strong increase in OTUs affiliated with Burkholderia-Paraburkholderia, Phenylobacterium, Pseudolabrys, Edaphobacter and Sphingomonas. Dominance at high temperature was explained by a priori adaptation to high temperature, high growth potential as well as stress resistance. At the highest temperature, we moreover observed an overall increase in copiotrophic properties in the community along with high growth rates. Further, temperature effects on community structures depended on the long-term climatic legacy of the soils. These findings contribute to extrapolating from single to multiple sites across a large range of conditions.</p>},
  author       = {Donhauser, Johanna and Niklaus, Pascal A. and Rousk, Johannes and Larose, Catherine and Frey, Beat},
  issn         = {0038-0717},
  language     = {eng},
  publisher    = {Elsevier},
  series       = {Soil Biology and Biochemistry},
  title        = {Temperatures beyond the community optimum promote the dominance of heat-adapted, fast growing and stress resistant bacteria in alpine soils},
  url          = {http://dx.doi.org/10.1016/j.soilbio.2020.107873},
  doi          = {10.1016/j.soilbio.2020.107873},
  volume       = {148},
  year         = {2020},
}