Metabolic flexibility of aerobic methanotrophs under anoxic conditions in Arctic lake sediments.

ABSTRACT: Methane (CH₄) emissions from Arctic lakes are a large and growing source of greenhouse gas to the atmosphere with critical implications for global climate. Because Arctic lakes are ice covered for much of the year, understanding the metabolic flexibility of methanotrophs under anoxic conditions would aid in characterizing the mechanisms responsible for limiting CH₄ emissions from high-latitude regions. Using sediments from an active CH₄ seep in Lake Qalluuraq, Alaska, we conducted DNA-based stable isotope probing (SIP) in anoxic mesocosms and found that aerobic Gammaproteobacterial methanotrophs dominated in assimilating CH₄. Aerobic methanotrophs were also detected down to 70 cm deep in sediments at the seep site, where anoxic conditions persist

SUBMITTER: He R 

PROVIDER: S-EPMC8692461 | biostudies-literature | 2022 Jan

REPOSITORIES: biostudies-literature