DOI: 10.1111/gbi.12095
Scopus记录号: 2-s2.0-84908015139
论文题名: Anaerobic oxidation of methane by sulfate in hypersaline groundwater of the Dead Sea aquifer
作者: Avrahamov N. ; Antler G. ; Yechieli Y. ; Gavrieli I. ; Joye S.B. ; Saxton M. ; Turchyn A.V. ; Sivan O.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2014
卷: 12, 期: 6 起始页码: 511
结束页码: 528
语种: 英语
Scopus关键词: ground water
; methane
; sulfate
; sulfide
; anaerobic growth
; chemistry
; microbiology
; oxidation reduction reaction
; salinity
; Anaerobiosis
; Groundwater
; Methane
; Oxidation-Reduction
; Salinity
; Sulfates
; Sulfides
; Water Microbiology
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: Geochemical and microbial evidence points to anaerobic oxidation of methane (AOM) likely coupled with bacterial sulfate reduction in the hypersaline groundwater of the Dead Sea (DS) alluvial aquifer. Groundwater was sampled from nine boreholes drilled along the Arugot alluvial fan next to the DS. The groundwater samples were highly saline (up to 6300 mm chlorine), anoxic, and contained methane. A mass balance calculation demonstrates that the very low δ13CDIC in this groundwater is due to anaerobic methane oxidation. Sulfate depletion coincident with isotope enrichment of sulfur and oxygen isotopes in the sulfate suggests that sulfate reduction is associated with this AOM. DNA extraction and 16S amplicon sequencing were used to explore the microbial community present and were found to be microbial composition indicative of bacterial sulfate reducers associated with anaerobic methanotrophic archaea (ANME) driving AOM. The net sulfate reduction seems to be primarily controlled by the salinity and the available methane and is substantially lower as salinity increases (2.5 mm sulfate removal at 3000 mm chlorine but only 0.5 mm sulfate removal at 6300 mm chlorine). Low overall sulfur isotope fractionation observed (34ε = 17 ± 3.5‰) hints at high rates of sulfate reduction, as has been previously suggested for sulfate reduction coupled with methane oxidation. The new results demonstrate the presence of sulfate-driven AOM in terrestrial hypersaline systems and expand our understanding of how microbial life is sustained under the challenging conditions of an extremely hypersaline environment. © 2014 The Authors. Geobiology Published by John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85176
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: Department of Geological and Environmental Sciences, Ben Gurion University of the Negev, Beer-Sheva, Israel; Department of Earth Sciences, University of Cambridge, Cambridge, United Kingdom; The Geological Survey of Israel, Jerusalem, Israel; Department of Marine Sciences, The University of Georgia, Athens, GA, United States
Recommended Citation:
Avrahamov N.,Antler G.,Yechieli Y.,et al. Anaerobic oxidation of methane by sulfate in hypersaline groundwater of the Dead Sea aquifer[J]. Geobiology,2014-01-01,12(6)