Diverse sediment microbiota shape methane emission temperature sensitivity in Arctic lakes.

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

SUBMITTER: Emerson JB 

PROVIDER: S-EPMC8492752 | biostudies-literature | 2021 Oct

REPOSITORIES: biostudies-literature