In aquatic ecosystems, nitrogen (N) loading is mitigated in redox transition zones principally through the processes of denitrification and anaerobic oxidation of ammonium (anammox). Here, we investigate the N cycling processes in the water column of a seasonal stratified lake influenced by benthic processes in Southern Germany (Fohnsee) during the development of the vertical redox stratification between April and September. C...

Summary Stimulating litho‐autotrophic denitrification in aquifers with hydrogen is a promising strategy to remove excess NO 3 − , but it often entails accumulation of the cytotoxic intermediate NO 2 − and the greenhouse gas N 2 O. To explore if these high NO 2 − and N 2 O concentrations are caused by differences in the genomic composition, the regulation of gene transcription or the kinetics of the reductases involved, we isol...