Diverse sediment microbiota shape methane emission temperature sensitivity in Arctic lakes

Joanne B. Emerson (), Ruth K. Varner (), Martin Wik, Donovan H. Parks, Rebecca B. Neumann, Joel E. Johnson, Caitlin M. Singleton, Ben J. Woodcroft, Rodney Tollerson, Akosua Owusu-Dommey, Morgan Binder, Nancy L. Freitas, Patrick M. Crill, Scott R. Saleska, Gene W. Tyson and Virginia I. Rich ()
Additional contact information
Joanne B. Emerson: The Ohio State University
Ruth K. Varner: University of New Hampshire
Martin Wik: Stockholm University
Donovan H. Parks: Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, University of Queensland
Rebecca B. Neumann: Civil & Environmental Engineering, University of Washington
Joel E. Johnson: University of New Hampshire
Caitlin M. Singleton: Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, University of Queensland
Ben J. Woodcroft: Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, University of Queensland
Rodney Tollerson: The Ohio State University
Akosua Owusu-Dommey: University of Arizona
Morgan Binder: University of Arizona
Nancy L. Freitas: University of Arizona
Patrick M. Crill: Stockholm University
Scott R. Saleska: University of Arizona
Gene W. Tyson: Australian Centre for Ecogenomics, School of Chemistry and Molecular Biosciences, University of Queensland
Virginia I. Rich: The Ohio State University

Nature Communications, 2021, vol. 12, issue 1, 1-10

Abstract: Abstract Northern post-glacial lakes are significant, increasing sources of atmospheric carbon through ebullition (bubbling) of microbially-produced methane (CH4) from sediments. Ebullitive CH4 flux correlates strongly with temperature, reflecting that solar radiation drives emissions. However, here we show that the slope of the temperature-CH4 flux relationship differs spatially across two post-glacial lakes in Sweden. We compared these CH4 emission patterns with sediment microbial (metagenomic and amplicon), isotopic, and geochemical data. The temperature-associated increase in CH4 emissions was greater in lake middles—where methanogens were more abundant—than edges, and sediment communities were distinct between edges and middles. Microbial abundances, including those of CH4-cycling microorganisms and syntrophs, were predictive of porewater CH4 concentrations. Results suggest that deeper lake regions, which currently emit less CH4 than shallower edges, could add substantially to CH4 emissions in a warmer Arctic and that CH4 emission predictions may be improved by accounting for spatial variations in sediment microbiota.

Date: 2021
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DOI: 10.1038/s41467-021-25983-9

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