Nitrite accumulation and anammox bacterial niche partitioning in Arctic Mid-Ocean Ridge sediments.

ABSTRACT: By consuming ammonium and nitrite, anammox bacteria form an important functional guild in nitrogen cycling in many environments, including marine sediments. However, their distribution and impact on the important substrate nitrite has not been well characterized. Here we combined biogeochemical, microbiological, and genomic approaches to study anammox bacteria and other nitrogen cycling groups in two sediment cores retrieved from the Arctic Mid-Ocean Ridge (AMOR). We observed nitrite accumulation in these cores, a phenomenon also recorded at 28 other marine sediment sites and in analogous aquatic environments. The nitrite maximum coincides with reduced abundance of anammox bacteria. Anammox bacterial abundances were at least one order of magnitude higher than those of nitrite reducers and

SUBMITTER: Zhao R 

PROVIDER: S-EPMC10060263 | biostudies-literature | 2023 Mar

REPOSITORIES: biostudies-literature