Deep-sea methane seep sediments in the Okhotsk Sea sustain diverse and abundant anammox bacteria
| Autor: | Martin G. Klotz, Hongyue Dang, Sudong Shao, Lingqing Dai, Yakun Zhao, Haitao Liu, Ying Ye, Xiwu Luan, Yunbo Zhang, Haixia Zhou |
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| Rok vydání: | 2013 |
| Předmět: |
Biogeochemical cycle
Geologic Sediments Oceans and Seas Molecular Sequence Data Biology Applied Microbiology and Biotechnology Microbiology Deep sea Methane chemistry.chemical_compound RNA Ribosomal 16S Ammonium Compounds Nitrites Phylogeny Chemosynthesis Nitrates Ecology Bacteria Base Sequence Sediment Genes rRNA Biodiversity Anoxic waters Cold seep chemistry Anammox Genes Bacterial Oxidoreductases Water Microbiology |
| Zdroj: | FEMS microbiology ecology. 87(2) |
| ISSN: | 1574-6941 |
| Popis: | Marginal sea methane seep sediments sustain highly productive chemosynthetic ecosystems and are hotspots of intense biogeochemical cycling. Rich methane supply stimulates rapid microbial consumption of oxygen; these systems are thus usually hypoxic to anoxic. This and reported evidence for resident nitrogen fixation suggest the presence of an anaerobic ammonium-oxidizing (anammox) bacterial community in methane seep sediments. To test this hypothesis, we employed detection of genes encoding 16S rRNA gene and hydrazine dehydrogenase (hzo) to investigate the structure, abundance and distribution of the anammox bacterial community in the methane seep sediments of the Okhotsk Sea. Diverse complements of Candidatus Scalindua-related 16S rRNA and hzo gene sequences were obtained. Most of the deep-sea sites harbored abundant hzo genes with copy numbers as high as 10(7) g(-1) sediment. In general, anammox bacterial signatures were significantly more abundant in the deep-water sediments. Sediment porewater NO3-, NOx- (i.e. NO3- + NO2-), NOx-/NH4+ and sediment silt content correlated with in situ distribution patterns of anammox bacterial marker genes, likely because they determine anammox substrate availability and sediment geochemistry, respectively. The abundance and distribution of anammox bacterial gene markers indicate a potentially significant contribution of anammox bacteria to the marine N cycle in the deep-sea methane seep sediments. |
| Databáze: | OpenAIRE |
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