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- W2998382010 abstract "Abstract Diazotrophic microorganisms regulate marine productivity by alleviating nitrogen limitation. However, we know little about the identity and activity of diazotrophs in deep-sea sediments, a habitat covering nearly two-thirds of the planet. Here, we identify candidate diazotrophs from Pacific Ocean sediments collected at 2893 m water depth using 15 N-DNA stable isotope probing and a novel pipeline for nifH sequence analysis. Together, these approaches detect an unexpectedly diverse assemblage of active diazotrophs, including members of the Acidobacteria , Firmicutes , Nitrospirae , Gammaproteobacteria , and Deltaproteobacteria. Deltaproteobacteria , predominately members of the Desulfobacterales and Desulfuromonadales , are the most abundant diazotrophs detected, and display the most microdiversity of associated nifH sequences. Some of the detected lineages, including those within the Acidobacteria , have not previously been shown to fix nitrogen. The diazotrophs appear catabolically diverse, with the potential for using oxygen, nitrogen, iron, sulfur, and carbon as terminal electron acceptors. Therefore, benthic diazotrophy may persist throughout a range of geochemical conditions and provide a stable source of fixed nitrogen over geologic timescales. Our results suggest that nitrogen-fixing communities in deep-sea sediments are phylogenetically and catabolically diverse, and open a new line of inquiry into the ecology and biogeochemical impacts of deep-sea microorganisms." @default.
- W2998382010 created "2020-01-10" @default.
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- W2998382010 creator A5075006680 @default.
- W2998382010 date "2020-01-06" @default.
- W2998382010 modified "2023-10-12" @default.
- W2998382010 title "Evidence for phylogenetically and catabolically diverse active diazotrophs in deep-sea sediment" @default.
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- W2998382010 doi "https://doi.org/10.1038/s41396-019-0584-8" @default.
- W2998382010 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7082343" @default.
- W2998382010 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/31907368" @default.
- W2998382010 hasPublicationYear "2020" @default.