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Microbial evolution reshapes soil carbon feedbacks to climate change

View ORCID ProfileElsa Abs, View ORCID ProfileScott R. Saleska, View ORCID ProfileRegis Ferriere
doi: https://doi.org/10.1101/641399
Elsa Abs
1Department of Ecology and Evolutionary Biology, University of California, Irvine, USA
2International Center for Interdisciplinary Global Environmental Studies (iGLOBES), CNRS, Ecole Normale Supérieure, Paris Sciences & Lettres University, University of Arizona, Tucson, AZ 85721, USA
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  • For correspondence: eabs@uci.edu
Scott R. Saleska
3Department of Ecology & Evolutionary Biology, University of Arizona, Tucson, AZ 85721, USA
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Regis Ferriere
2International Center for Interdisciplinary Global Environmental Studies (iGLOBES), CNRS, Ecole Normale Supérieure, Paris Sciences & Lettres University, University of Arizona, Tucson, AZ 85721, USA
3Department of Ecology & Evolutionary Biology, University of Arizona, Tucson, AZ 85721, USA
4Institut de Biologie (IBENS), Ecole Normale Supérieure, Paris Sciences & Lettres University, CNRS, INSERM, 75005 Paris, France
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Abstract

Microbial decomposition of soil organic matter is a key component of the global carbon cycle. As Earth’s climate changes, the response of microbes and microbial enzymes to rising temperatures will largely determine the soil carbon feedback to atmospheric CO2. However, while increasing attention focuses on physiological and ecological mechanisms of microbial responses, the role of evolutionary adaptation has been little studied. To address this gap, we developed an ecosystem-evolutionary model of a soil microbe-enzyme system under warming. Constraining the model with observations from five contrasting sites reveals evolutionary aggravation of soil carbon loss to be the most likely outcome; however, temperature-dependent increases in mortality could cause an evolutionary buffering effect instead. We generally predict a strong latitudinal pattern, from small evolutionary effects at low latitude to large evolutionary effects at high latitudes. Accounting for evolutionary mechanisms will likely be critical for improving projections of Earth system responses to climate change.

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Posted July 29, 2019.
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Microbial evolution reshapes soil carbon feedbacks to climate change
Elsa Abs, Scott R. Saleska, Regis Ferriere
bioRxiv 641399; doi: https://doi.org/10.1101/641399
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Microbial evolution reshapes soil carbon feedbacks to climate change
Elsa Abs, Scott R. Saleska, Regis Ferriere
bioRxiv 641399; doi: https://doi.org/10.1101/641399

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