气候变化领域集成服务门户(CCPortal): Anoxic chlorophyll maximum enhances local organic matter remineralization and nitrogen loss in Lake Tanganyika

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DOI	10.1038/s41467-021-21115-5
	Anoxic chlorophyll maximum enhances local organic matter remineralization and nitrogen loss in Lake Tanganyika
	Callbeck C.M.; Ehrenfels B.; Baumann K.B.L.; Wehrli B.; Schubert C.J.
发表日期	2021
ISSN	2041-1723
卷号	12 期号:1
英文摘要	In marine and freshwater oxygen-deficient zones, the remineralization of sinking organic matter from the photic zone is central to driving nitrogen loss. Deep blooms of photosynthetic bacteria, which form the suboxic/anoxic chlorophyll maximum (ACM), widespread in aquatic ecosystems, may also contribute to the local input of organic matter. Yet, the influence of the ACM on nitrogen and carbon cycling remains poorly understood. Using a suite of stable isotope tracer experiments, we examined the transformation of nitrogen and carbon under an ACM (comprising of Chlorobiaceae and Synechococcales) and a non-ACM scenario in the anoxic zone of Lake Tanganyika. We find that the ACM hosts a tight coupling of photo/litho-autotrophic and heterotrophic processes. In particular, the ACM was a hotspot of organic matter remineralization that controlled an important supply of ammonium driving a nitrification-anammox coupling, and thereby played a key role in regulating nitrogen loss in the oxygen-deficient zone. © 2021, The Author(s).
语种	英语
scopus关键词	ammonia; chlorophyll; nitrogen; organic matter; stable isotope; ammonium derivative; carbon; chlorophyll; nitrogen; anoxic conditions; biotransformation; chlorophyll; heterotrophy; microbial activity; nitrifying bacterium; nitrogen compound; nutrient loss; photic zone; remineralization; stable isotope; tracer; anaerobic ammonium oxidation; Article; carbon cycling; Chlorobiaceae; controlled study; lake; mineralization; nitrification; nitrogen cycling; nonhuman; Synechococcus; Tanzania; anaerobic growth; autotrophy; carbon cycle; chemistry; Chlorobi; Democratic Republic Congo; ecosystem; isotope labeling; lake; metabolism; microbiology; nitrogen cycle; oxidation reduction reaction; physiology; Democratic Republic Congo; East African Lakes; Lake Tanganyika; Tanganyika; Chlorobiaceae; Photobacteria; Ammonium Compounds; Anaerobiosis; Autotrophic Processes; Carbon; Carbon Cycle; Chlorobi; Chlorophyll; Democratic Republic of the Congo; Ecosystem; Isotope Labeling; Lakes; Nitrification; Nitrogen; Nitrogen Cycle; Oxidation-Reduction; Synechococcus; Tanzania
来源期刊	Nature Communications
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/250772
作者单位	Eawag, Swiss Federal Institute of Aquatic Science and Technology, Surface Waters—Research and Management, Kastanienbaum, Switzerland; Institute of Biogeochemistry and Pollutant Dynamics, ETH Zurich, Zurich, Switzerland
推荐引用方式 GB/T 7714	Callbeck C.M.,Ehrenfels B.,Baumann K.B.L.,et al. Anoxic chlorophyll maximum enhances local organic matter remineralization and nitrogen loss in Lake Tanganyika[J],2021,12(1).
APA	Callbeck C.M.,Ehrenfels B.,Baumann K.B.L.,Wehrli B.,&Schubert C.J..(2021).Anoxic chlorophyll maximum enhances local organic matter remineralization and nitrogen loss in Lake Tanganyika.Nature Communications,12(1).
MLA	Callbeck C.M.,et al."Anoxic chlorophyll maximum enhances local organic matter remineralization and nitrogen loss in Lake Tanganyika".Nature Communications 12.1(2021).