globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12089
Scopus记录号: 2-s2.0-84902347348
论文题名:
Deep-water anoxygenic photosythesis in a ferruginous chemocline
作者: Crowe S.A.; Maresca J.A.; Jones C.; Sturm A.; Henny C.; Fowle D.A.; Cox R.P.; Delong E.F.; Canfield D.E.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2014
卷: 12, 期:4
起始页码: 322
结束页码: 339
语种: 英语
Scopus关键词: absorption ; anoxic conditions ; bacterium ; banded iron formation ; global ocean ; light availability ; microbial community ; mixing ; nutrient cycling ; oxidation ; Precambrian ; primary production ; Greater Sunda Islands ; Indonesia ; Lake Matano ; Malili Lakes ; South Sulawesi ; Sulawesi ; Sunda Isles ; iron ; pigment ; anaerobic growth ; chemistry ; Chlorobi ; lake ; light ; metabolism ; microbial consortium ; photosynthesis ; Anaerobiosis ; Chlorobi ; Iron ; Lakes ; Light ; Microbial Consortia ; Photosynthesis ; Pigments, Biological
Scopus学科分类: Earth and Planetary Sciences: General Earth and Planetary Sciences ; Environmental Science: General Environmental Science ; Agricultural and Biological Sciences: Ecology, Evolution, Behavior and Systematic
英文摘要: Ferruginous Lake Matano, Indonesia hosts one of the deepest anoxygenic photosynthetic communities on Earth. This community is dominated by low-light adapted, BChl e-synthesizing green sulfur bacteria (GSB), which comprise ~25% of the microbial community immediately below the oxic-anoxic boundary (OAB; 115-120 m in 2010). The size of this community is dependent on the mixing regime within the lake and the depth of the OAB-at ~117 m, the GSB live near their low-light limit. Slow growth and C-fixation rates suggest that the Lake Matano GSB can be supported by sulfide even though it only accumulates to scarcely detectable (low μm to nm) concentrations. A model laboratory strain (Chlorobaculum tepidum) is indeed able to access HS- for oxidation at nm concentrations. Furthermore, the GSB in Lake Matano possess a full complement of S-oxidizing genes. Together, this physiological and genetic information suggests that deep-water GSB can be supported by a S-cycle, even under ferruginous conditions. The constraints we place on the metabolic capacity and physiology of GSB have important geobiological implications. Biomarkers diagnostic of GSB would be a good proxy for anoxic conditions but could not discriminate between euxinic and ferruginous states, and though GSB biomarkers could indicate a substantial GSB community, such a community may exist with very little metabolic activity. The light requirements of GSB indicate that at light levels comparable to those in the OAB of Lake Matano or the Black Sea, GSB would have contributed little to global ocean primary production, nutrient cycling, and banded iron formation (BIF) deposition in the Precambrian. Before the proliferation of oxygenic photosynthesis, shallower OABs and lower light absorption in the ocean's surface waters would have permitted greater light availability to GSB, potentially leading to a greater role for GSB in global biogeochemical cycles. © 2014 John Wiley & Sons Ltd.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85173
Appears in Collections:影响、适应和脆弱性

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作者单位: Nordic Center for Earth Evolution and Institute of Biology, University of Southern Denmark, Odense, Denmark; Departments of Microbiology and Immunology and Earth, Ocean, and Atmospheric Sciences, University of British Columbia, Vancouver, Canada; Department of Civil and Environmental Engineering, MIT, Cambridge, MA, United States; Depatment of Civil and Environmental Engineering, University of Delaware, Newark, DE, United States; Department of Geology, University of Kansas, Lawrence, KS, United States; Limnology Division, Indonesian Institute of Sciences, Cibinong, Indonesia; Nordic Center for Earth Evolution and Department of Biochemistry and Molecular Biology, University of Southern Denmark, Odense, Denmark

Recommended Citation:
Crowe S.A.,Maresca J.A.,Jones C.,et al. Deep-water anoxygenic photosythesis in a ferruginous chemocline[J]. Geobiology,2014-01-01,12(4)
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