High concentrations of dissolved biogenic methane associated with cyanobacterial blooms in East African lake surface water.

ABSTRACT: The contribution of oxic methane production to greenhouse gas emissions from lakes is globally relevant, yet uncertainties remain about the levels up to which methanogenesis can counterbalance methanotrophy by leading to CH₄ oversaturation in productive surface waters. Here, we explored the biogeochemical and microbial community variation patterns in a meromictic soda lake, in the East African Rift Valley (Kenya), showing an extraordinarily high concentration of methane in oxic waters (up to 156 µmol L^-1). Vertical profiles of dissolved gases and their isotopic signature indicated a biogenic origin of CH₄. A bloom of Oxyphotobacteria co-occurred with abundant hydrogenotrophic and acetoclastic methanogens, mostly found within suspended aggregates promoting t

SUBMITTER: Fazi S 

PROVIDER: S-EPMC8263762 | biostudies-literature | 2021 Jul

REPOSITORIES: biostudies-literature