%AEmerson, Joanne%AVarner, Ruth%AWik, Martin%AParks, Donovan%ANeumann, Rebecca%AJohnson, Joel%ASingleton, Caitlin%AWoodcroft, Ben%ATollerson, II, Rodney%AOwusu-Dommey, Akosua%ABinder, Morgan%AFreitas, Nancy%ACrill, Patrick%ASaleska, Scott%ATyson, Gene%ARich, Virginia%BJournal Name: Nature Communications; Journal Volume: 12; Journal Issue: 1; Related Information: CHORUS Timestamp: 2022-12-02 10:46:53 %D2021%INature Publishing Group %JJournal Name: Nature Communications; Journal Volume: 12; Journal Issue: 1; Related Information: CHORUS Timestamp: 2022-12-02 10:46:53 %K %MOSTI ID: 10305337 %PMedium: X %TDiverse sediment microbiota shape methane emission temperature sensitivity in Arctic lakes %XAbstract

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.

%0Journal Article