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学科主题: Marine & Freshwater Biology; Oceanography
题名: Chemoautotrophy in the redox transition zone of the Cariaco Basin: A significant midwater source of organic carbon production
作者: Taylor, GT ; Iabichella, M ; Ho, TY ; Scranton, MI ; Thunell, RC ; Muller-Karger, F ; Varela, R
刊名: LIMNOLOGY AND OCEANOGRAPHY
发表日期: 2001-01-01
卷: 46, 期:1, 页:148-163
部门归属: SUNY Stony Brook, Marine Sci Res Ctr, Stony Brook, NY 11794 USA; Univ S Carolina, Dept Geol Sci, Columbia, SC 29208 USA; Univ S Florida, Dept Marine Sci, St Petersburg, FL 33701 USA; Fdn Salle Ciencias Nat, Estac Invest Marinas Margarita, Punta De Piedras, Edo Nueva Espar, Venezuela
英文摘要: During the CARIACO time series program, microbial standing stocks, bacterial production, and acetate turnover were consistently elevated in the redox transition zone (RTZ) of the Cariaco Basin, the depth interval (similar to 240-450 m) of steepest gradient in oxidation-reduction potential. Anomalously high fluxes of particulate carbon were captured in sediment traps below this zone (455 m) in 16 of 71 observations. Here we present new evidence that bacterial chemoautotrophy, fueled by reduced sulfur species, supports an active secondary microbial food web in the RTZ and is potentially a large midwater source of labile, chemically unique, sedimenting biogenic debris to the basin's interior. Dissolved inorganic carbon assimilation (27-159 mmol C m(-2) d(-1)) in this zone was equivalent to 10%-333% of contemporaneous primary production, depending on the season. However, vertical diffusion rates to the RTZ of electron donors and electron accepters were inadequate to support this production. Therefore, significant lateral intrusions of oxic waters, mixing processes, or intensive cycling of C, S, N, Mn, and Fe across the RTZ are necessary to balance electron equivalents. Chemoautotrophic production appears to be decoupled temporally from short-term surface processes, such as seasonal upwelling and blooms, and potentially is more responsive to longterm changes in surface productivity and deep-water ventilation on interannual to decadal timescales. Findings suggest that midwater production of organic carbon may contribute a unique signature to the basin's sediment record, thereby altering its paleoclimatological interpretation.
语种: 英语
原文出处: 查看原文
内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/9328
Appears in Collections:海洋微食物网高被引文献_期刊论文

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Taylor, GT; Iabichella, M; Ho, TY; Scranton, MI; Thunell, RC; Muller-Karger, F; Varela, R.Chemoautotrophy in the redox transition zone of the Cariaco Basin: A significant midwater source of organic carbon production,LIMNOLOGY AND OCEANOGRAPHY,2001,46(1):148-163
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