Aerobic and anaerobic methane oxidation in a seasonally anoxic basin.

ABSTRACT: Shallow coastal waters are dynamic environments that dominate global marine methane emissions. Particularly high methane concentrations are found in seasonally anoxic waters, which are spreading in eutrophic coastal systems, potentially leading to increased methane emissions to the atmosphere. Here we explore how the seasonal development of anoxia influenced methane concentrations, rates of methane oxidation, and the community composition of methanotrophs in the shallow eutrophic water column of Mariager Fjord, Denmark. Our results show the development of steep concentration gradients toward the oxic-anoxic interface as methane accumulated to 1.4 μM in anoxic bottom waters. Yet, the fjord possessed an efficient microbial methane filter near the oxic-anoxic interface that responded t

SUBMITTER: Steinsdottir HGR 

PROVIDER: S-EPMC9540798 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature