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Prolonged exposure does not increase soil microbial community response to warming along geothermal gradients

Dajana Radujković, Erik Verbruggen, Bjarni D. Sigurdsson, Niki I. W. Leblans, Sara Vicca, James T. Weedon
doi: https://doi.org/10.1101/102459
Dajana Radujković
1University of Antwerp, Department of Biology, Universiteitsplein 1, 2610 Wilrijk, Belgium.
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Erik Verbruggen
1University of Antwerp, Department of Biology, Universiteitsplein 1, 2610 Wilrijk, Belgium.
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Bjarni D. Sigurdsson
2Agricultural University of Iceland, Hvanneyri, IS-311 Borgarnes, Iceland.
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Niki I. W. Leblans
1University of Antwerp, Department of Biology, Universiteitsplein 1, 2610 Wilrijk, Belgium.
2Agricultural University of Iceland, Hvanneyri, IS-311 Borgarnes, Iceland.
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Sara Vicca
1University of Antwerp, Department of Biology, Universiteitsplein 1, 2610 Wilrijk, Belgium.
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James T. Weedon
1University of Antwerp, Department of Biology, Universiteitsplein 1, 2610 Wilrijk, Belgium.
3Institute of Ecological Science, VU University Amsterdam, De Boelelaan 1085, 1081 HV Amsterdam, The Netherlands.
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  • For correspondence: james.weedon@vu.nl
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ABSTRACT

Predicting effects of climate change on ecosystem functioning requires knowledge of soil microbial community responses to warming. We used natural geothermal gradients (from +1°C to +19°C above ambient) in two subarctic grasslands to test the hypothesis that long-term exposure (>50 years) intensifies microbial community responses to warming compared to short-term exposure (5-7 years). Community profiles from amplicon sequencing of bacterial and fungal rRNA genes did not support this hypothesis: significant changes relative to ambient were observed from +9°C and upwards in the long-term and from 7°C to 11°C / +3°C to +5°C and upwards in the short-term, for bacteria and fungi, respectively. Our results suggest that bacterial communities in high-latitude grasslands will not undergo lasting shifts in community composition under the warming predicted for the coming 100 years. Fungal communities do appear to be temperature sensitive to the warming within this range, but only for short-term exposures.

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The copyright holder for this preprint is the author/funder, who has granted bioRxiv a license to display the preprint in perpetuity. It is made available under a CC-BY-NC-ND 4.0 International license.
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Posted January 24, 2017.
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Prolonged exposure does not increase soil microbial community response to warming along geothermal gradients
Dajana Radujković, Erik Verbruggen, Bjarni D. Sigurdsson, Niki I. W. Leblans, Sara Vicca, James T. Weedon
bioRxiv 102459; doi: https://doi.org/10.1101/102459
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Prolonged exposure does not increase soil microbial community response to warming along geothermal gradients
Dajana Radujković, Erik Verbruggen, Bjarni D. Sigurdsson, Niki I. W. Leblans, Sara Vicca, James T. Weedon
bioRxiv 102459; doi: https://doi.org/10.1101/102459

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