气候变化领域集成服务门户(CCPortal): Anammox bacteria drive fixed nitrogen loss in hadal trench sediments

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DOI	10.1073/pnas.2104529118
	Anammox bacteria drive fixed nitrogen loss in hadal trench sediments
	Thamdrup B.; Schauberger C.; Larsen M.; Trouche B.; Maignien L.; Arnaud-Haond S.; Wenzhöfer F.; Glud R.N.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:46
英文摘要	Benthic N2 production by microbial denitrification and anammox is the largest sink for fixed nitrogen in the oceans. Most N2 production occurs on the continental shelves, where a high flux of reactive organic matter fuels the depletion of nitrate close to the sediment surface. By contrast, N2 production rates in abyssal sediments are low due to low inputs of reactive organics, and nitrogen transformations are dominated by aerobic nitrification and the release of nitrate to the bottom water. Here, we demonstrate that this trend is reversed in the deepest parts of the oceans, the hadal trenches, where focusing of reactive organic matter enhances benthic microbial activity. Thus, at ∼8-km depth in the Atacama Trench, underlying productive surface waters, nitrate is depleted within a few centimeters of the sediment surface, N2 production rates reach those reported from some continental margin sites, and fixed nitrogen loss is mainly conveyed by anammox bacteria. These bacteria are closely related to those known from shallow oxygen minimum zone waters, and comparison of activities measured in the laboratory and in situ suggest they are piezotolerant. Even the Kermadec Trench, underlying oligotrophic surface waters, exhibits substantial fixed N removal. Our results underline the role of hadal sediments as hot spots of deep-sea biological activity, revealing a fully functional benthic nitrogen cycle at high hydrostatic pressure and pointing to hadal sediments as a previously unexplored niche for anaerobic microbial ecology and diagenesis. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Denitrification; Hadal trenches; Marine biogeochemistry; Microbial ecology
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238308
作者单位	Nordcee and HADAL, Department of Biology, University of Southern Denmark, Odense M, 5230, Denmark; Microbiology of Extreme Environments Laboratory, CNRS, Institut Français de Recherche pour L'Exploitation de la Mer, University of Brest, Plouzane, 29280, France; MARBEC, Universite Montpellier, Institut Français de Recherche pour L'Exploitation de la Mer, CNRS, Institut de recherche pour le developpement, Sete, 34203, France; HGF-MPG Group for Deep Sea Ecology and Technology, Alfred Wegener Institute Helmholtz Center for Polar and Marine Research, Bremerhaven, 27570, Germany; HGF-MPG Group for Deep Sea Ecology and Technology, Max Planck Institute for Marine Microbiology, Bremen, 28357, Germany; Department of Ocean and Environmental Sciences, Tokyo University of Marine Science and Technology, Tokyo, 108-8477, Japan; Danish Institute of Advanced Study, University of Southern Denmark, Odense M, 5230, Denmark
推荐引用方式 GB/T 7714	Thamdrup B.,Schauberger C.,Larsen M.,et al. Anammox bacteria drive fixed nitrogen loss in hadal trench sediments[J],2021,118(46).
APA	Thamdrup B..,Schauberger C..,Larsen M..,Trouche B..,Maignien L..,...&Glud R.N..(2021).Anammox bacteria drive fixed nitrogen loss in hadal trench sediments.Proceedings of the National Academy of Sciences of the United States of America,118(46).
MLA	Thamdrup B.,et al."Anammox bacteria drive fixed nitrogen loss in hadal trench sediments".Proceedings of the National Academy of Sciences of the United States of America 118.46(2021).