globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12239
Scopus记录号: 2-s2.0-85017567567
论文题名:
Shifting microbial communities sustain multiyear iron reduction and methanogenesis in ferruginous sediment incubations
作者: Bray M.S.; Wu J.; Reed B.C.; Kretz C.B.; Belli K.M.; Simister R.L.; Henny C.; Stewart F.J.; DiChristina T.J.; Brandes J.A.; Fowle D.A.; Crowe S.A.; Glass J.B.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2017
卷: 15, 期:5
起始页码: 678
结束页码: 689
语种: 英语
Scopus关键词: Archean ; bacterium ; ferrihydrite ; flux measurement ; iron ; marine sediment ; methane ; methanogenesis ; microbial activity ; microbial community ; oxidation ; Proterozoic ; reduction ; sediment chemistry ; Greater Sunda Islands ; Lake Matano ; Malili Lakes ; South Sulawesi ; Sulawesi ; Sunda Isles ; Desulfuromonadales
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: Reactive Fe(III) minerals can influence methane (CH4) emissions by inhibiting microbial methanogenesis or by stimulating anaerobic CH4 oxidation. The balance between Fe(III) reduction, methanogenesis, and CH4 oxidation in ferruginous Archean and Paleoproterozoic oceans would have controlled CH4 fluxes to the atmosphere, thereby regulating the capacity for CH4 to warm the early Earth under the Faint Young Sun. We studied CH4 and Fe cycling in anoxic incubations of ferruginous sediment from the ancient ocean analogue Lake Matano, Indonesia, over three successive transfers (500 days in total). Iron reduction, methanogenesis, CH4 oxidation, and microbial taxonomy were monitored in treatments amended with ferrihydrite or goethite. After three dilutions, Fe(III) reduction persisted only in bottles with ferrihydrite. Enhanced CH4 production was observed in the presence of goethite, highlighting the potential for reactive Fe(III) oxides to inhibit methanogenesis. Supplementing the media with hydrogen, nickel and selenium did not stimulate methanogenesis. There was limited evidence for Fe(III)-dependent CH4 oxidation, although some incubations displayed CH4-stimulated Fe(III) reduction. 16S rRNA profiles continuously changed over the course of enrichment, with ultimate dominance of unclassified members of the order Desulfuromonadales in all treatments. Microbial diversity decreased markedly over the course of incubation, with subtle differences between ferrihydrite and goethite amendments. These results suggest that Fe(III) oxide mineralogy and availability of electron donors could have led to spatial separation of Fe(III)-reducing and methanogenic microbial communities in ferruginous marine sediments, potentially explaining the persistence of CH4 as a greenhouse gas throughout the first half of Earth history. © 2017 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/85045
Appears in Collections:影响、适应和脆弱性

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作者单位: School of Biology, Georgia Institute of Technology, Atlanta, GA, United States; School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA, United States; Departments of Microbiology & Immunology and Earth, Ocean, & Atmospheric Sciences, University of British Columbia, Vancouver, BC, Canada; Research Center for Limnology, Indonesian Institute of Sciences, Cibinong, Indonesia; Skidaway Institute of Oceanography, Savannah, GA, United States; Department of Geology, University of Kansas, Lawrence, KS, United States

Recommended Citation:
Bray M.S.,Wu J.,Reed B.C.,et al. Shifting microbial communities sustain multiyear iron reduction and methanogenesis in ferruginous sediment incubations[J]. Geobiology,2017-01-01,15(5)
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