Methane dynamics regulated by microbial community response to permafrost thaw
Permafrost contains about50% of the global soil carbon. It is thought that the thawing of permafrost can lead to a loss of soil carbon in the form of methane and carbon dioxide emissions. The magnitude of the resulting positive climate feedback of such greenhouse gas emissions is still unknown and m...
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:344220 2023-05-15T17:55:37+02:00 Methane dynamics regulated by microbial community response to permafrost thaw McCalley, Carmody K. Woodcroft, Ben J. Hodgkins, Suzanne B. Wehr, Richard A. Kim, Eun-Hae Mondav, Rhiannon Crill, Patrick M. Chanton, Jeffrey P. Rich, Virginia I. Tyson, Gene W. Saleska, Scott R. 2014-10-01 https://espace.library.uq.edu.au/view/UQ:344220 eng eng Nature Publishing Group doi:10.1038/nature13798 issn:0028-0836 issn:1476-4687 orcid:0000-0003-0670-7480 orcid:0000-0001-8559-9427 DE-SC0004632 Not set Multidisciplinary Sciences Science & Technology - Other Topics 1000 General Journal Article 2014 ftunivqespace https://doi.org/10.1038/nature13798 2020-12-22T10:45:16Z Permafrost contains about50% of the global soil carbon. It is thought that the thawing of permafrost can lead to a loss of soil carbon in the form of methane and carbon dioxide emissions. The magnitude of the resulting positive climate feedback of such greenhouse gas emissions is still unknown and may to a large extent depend on the poorly understood role of microbial community composition in regulating the metabolic processes that drive such ecosystem-scale greenhouse gas fluxes. Here we show that changes in vegetation and increasing methane emissionswith permafrost thaware associated with a switch from hydrogenotrophic to partly acetoclasticmethanogenesis, resulting inalargeshift in theδCsignature (10-15%) of emitted methane. We used a natural landscape gradient of permafrost thawinnorthern Sweden as a model to investigate the role of microbial communities in regulatingmethane cycling, and to test whether a knowledge of community dynamics could improvepredictions of carbonemissions under loss of permafrost. Abundance of the meth anogen Candidatus 'Meth anoflorens stordalenmirensis'6 is a key predictor of the shifts in methane isotopes, which in turn predicts the proportions of carbon emitted as methane and as carbon dioxide, an important factor for simulating the climate feedback associated with permafrost thaw in global models. By showing that the abundance of key microbial lineages can be used to predict atmospherically relevant patterns in methane isotopes and the proportion of carbonmetabolized to methane during permafrost thaw, we establish a basis for scaling changing microbial communities to ecosystem isotope dynamics. Our findings indicate that microbial ecology may be important in ecosystem-scale responses to global change. Article in Journal/Newspaper permafrost The University of Queensland: UQ eSpace Nature 514 7523 478 481 |
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Open Polar |
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The University of Queensland: UQ eSpace |
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ftunivqespace |
language |
English |
topic |
Multidisciplinary Sciences Science & Technology - Other Topics 1000 General |
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Multidisciplinary Sciences Science & Technology - Other Topics 1000 General McCalley, Carmody K. Woodcroft, Ben J. Hodgkins, Suzanne B. Wehr, Richard A. Kim, Eun-Hae Mondav, Rhiannon Crill, Patrick M. Chanton, Jeffrey P. Rich, Virginia I. Tyson, Gene W. Saleska, Scott R. Methane dynamics regulated by microbial community response to permafrost thaw |
topic_facet |
Multidisciplinary Sciences Science & Technology - Other Topics 1000 General |
description |
Permafrost contains about50% of the global soil carbon. It is thought that the thawing of permafrost can lead to a loss of soil carbon in the form of methane and carbon dioxide emissions. The magnitude of the resulting positive climate feedback of such greenhouse gas emissions is still unknown and may to a large extent depend on the poorly understood role of microbial community composition in regulating the metabolic processes that drive such ecosystem-scale greenhouse gas fluxes. Here we show that changes in vegetation and increasing methane emissionswith permafrost thaware associated with a switch from hydrogenotrophic to partly acetoclasticmethanogenesis, resulting inalargeshift in theδCsignature (10-15%) of emitted methane. We used a natural landscape gradient of permafrost thawinnorthern Sweden as a model to investigate the role of microbial communities in regulatingmethane cycling, and to test whether a knowledge of community dynamics could improvepredictions of carbonemissions under loss of permafrost. Abundance of the meth anogen Candidatus 'Meth anoflorens stordalenmirensis'6 is a key predictor of the shifts in methane isotopes, which in turn predicts the proportions of carbon emitted as methane and as carbon dioxide, an important factor for simulating the climate feedback associated with permafrost thaw in global models. By showing that the abundance of key microbial lineages can be used to predict atmospherically relevant patterns in methane isotopes and the proportion of carbonmetabolized to methane during permafrost thaw, we establish a basis for scaling changing microbial communities to ecosystem isotope dynamics. Our findings indicate that microbial ecology may be important in ecosystem-scale responses to global change. |
format |
Article in Journal/Newspaper |
author |
McCalley, Carmody K. Woodcroft, Ben J. Hodgkins, Suzanne B. Wehr, Richard A. Kim, Eun-Hae Mondav, Rhiannon Crill, Patrick M. Chanton, Jeffrey P. Rich, Virginia I. Tyson, Gene W. Saleska, Scott R. |
author_facet |
McCalley, Carmody K. Woodcroft, Ben J. Hodgkins, Suzanne B. Wehr, Richard A. Kim, Eun-Hae Mondav, Rhiannon Crill, Patrick M. Chanton, Jeffrey P. Rich, Virginia I. Tyson, Gene W. Saleska, Scott R. |
author_sort |
McCalley, Carmody K. |
title |
Methane dynamics regulated by microbial community response to permafrost thaw |
title_short |
Methane dynamics regulated by microbial community response to permafrost thaw |
title_full |
Methane dynamics regulated by microbial community response to permafrost thaw |
title_fullStr |
Methane dynamics regulated by microbial community response to permafrost thaw |
title_full_unstemmed |
Methane dynamics regulated by microbial community response to permafrost thaw |
title_sort |
methane dynamics regulated by microbial community response to permafrost thaw |
publisher |
Nature Publishing Group |
publishDate |
2014 |
url |
https://espace.library.uq.edu.au/view/UQ:344220 |
genre |
permafrost |
genre_facet |
permafrost |
op_relation |
doi:10.1038/nature13798 issn:0028-0836 issn:1476-4687 orcid:0000-0003-0670-7480 orcid:0000-0001-8559-9427 DE-SC0004632 Not set |
op_doi |
https://doi.org/10.1038/nature13798 |
container_title |
Nature |
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514 |
container_issue |
7523 |
container_start_page |
478 |
op_container_end_page |
481 |
_version_ |
1766163578758365184 |