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Emerson, Joanne B. ; Varner, Ruth K. ; Wik, Martin ; Parks, Donovan H. ; Neumann, Rebecca B. ; Johnson, Joel E. ; Singleton, Caitlin M. ; Woodcroft, Ben J. ; Tollerson, II, Rodney ; Owusu-Dommey, Akosua ; et al ( , Nature Communications)
Abstract Northern post-glacial lakes are significant, increasing sources of atmospheric carbon through ebullition (bubbling) of microbially-produced methane (CH4) from sediments. Ebullitive CH4flux correlates strongly with temperature, reflecting that solar radiation drives emissions. However, here we show that the slope of the temperature-CH4flux relationship differs spatially across two post-glacial lakes in Sweden. We compared these CH4emission patterns with sediment microbial (metagenomic and amplicon), isotopic, and geochemical data. The temperature-associated increase in CH4emissions 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 CH4concentrations. Results suggest that deeper lake regions, which currently emit less CH4than shallower edges, could add substantially to CH4emissions in a warmer Arctic and that CH4emission predictions may be improved by accounting for spatial variations in sediment microbiota.
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Roux, Simon ; Adriaenssens, Evelien M ; Dutilh, Bas E ; Koonin, Eugene V ; Kropinski, Andrew M ; Krupovic, Mart ; Kuhn, Jens H ; Lavigne, Rob ; Brister, J Rodney ; Varsani, Arvind ; et al ( , Nature Biotechnology)