DOI: 10.1111/gbi.12154
Scopus记录号: 2-s2.0-84944162374
论文题名: Barite encrustation of benthic sulfur-oxidizing bacteria at a marine cold seep
作者: Stevens E.W.N. ; Bailey J.V. ; Flood B.E. ; Jones D.S. ; Gilhooly W.P. ; Joye S.B. ; Teske A. ; Mason O.U.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2015
卷: 13, 期: 6 起始页码: 588
结束页码: 603
语种: 英语
Scopus关键词: bacterium
; barium
; benthos
; brine
; cold seep
; encrustation
; laboratory method
; oxygen isotope
; precipitation (chemistry)
; sediment-water interface
; sulfide
; Atlantic Ocean
; Gulf of Mexico
; Bacteria (microorganisms)
; Beggiatoa
; bacterial DNA
; barium sulfate
; RNA 16S
; sulfide
; bacterium
; Beggiatoa
; classification
; DNA sequence
; genetics
; Gulf of Mexico
; isolation and purification
; metabolism
; molecular genetics
; oxidation reduction reaction
; phylogeny
; Bacteria
; Barium Sulfate
; Beggiatoa
; DNA, Bacterial
; Gulf of Mexico
; Molecular Sequence Data
; Oxidation-Reduction
; Phylogeny
; RNA, Ribosomal, 16S
; Sequence Analysis, DNA
; Sulfides
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: Crusts and chimneys composed of authigenic barite are found at methane seeps and hydrothermal vents that expel fluids rich in barium. Microbial processes have not previously been associated with barite precipitation in marine cold seep settings. Here, we report on the precipitation of barite on filaments of sulfide-oxidizing bacteria at a brine seep in the Gulf of Mexico. Barite-mineralized bacterial filaments in the interiors of authigenic barite crusts resemble filamentous sulfide-oxidizing bacteria of the genus Beggiatoa. Clone library and iTag amplicon sequencing of the 16S rRNA gene show that the barite crusts that host these filaments also preserve DNA of Candidatus Maribeggiatoa, as well as sulfate-reducing bacteria. Isotopic analyses show that the sulfur and oxygen isotope compositions of barite have lower δ34S and δ18O values than many other marine barite crusts, which is consistent with barite precipitation in an environment in which sulfide oxidation was occurring. Laboratory experiments employing isolates of sulfide-oxidizing bacteria from Gulf of Mexico seep sediments showed that under low sulfate conditions, such as those encountered in brine fluids, sulfate generated by sulfide-oxidizing bacteria fosters rapid barite precipitation localized on cell biomass, leading to the encrustation of bacteria in a manner reminiscent of our observations of barite-mineralized Beggiatoa in the Gulf of Mexico. The precipitation of barite directly on filaments of sulfide-oxidizing bacteria, and not on other benthic substrates, suggests that sulfide oxidation plays a role in barite formation at certain marine brine seeps where sulfide is oxidized to sulfate in contact with barium-rich fluids, either prior to, or during, the mixing of those fluids with sulfate-containing seawater in the vicinity of the sediment/water interface. As with many other geochemical interfaces that foster mineral precipitation, both biological and abiological processes likely contribute to the precipitation of barite at marine brine seeps such as the one studied here. © 2015 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85127
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Earth Sciences, University of Minnesota-Twin Cities, Minneapolis, MN, United States; Department of Earth Sciences, Indiana University-Purdue University Indianapolis, Indianapolis, IN, United States; Department of Marine Sciences, University of Georgia, Athens, GA, United States; Department of Marine Sciences, University of North Carolina at Chapel Hill, Chapel Hill, NC, United States; Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL, United States
Recommended Citation:
Stevens E.W.N.,Bailey J.V.,Flood B.E.,et al. Barite encrustation of benthic sulfur-oxidizing bacteria at a marine cold seep[J]. Geobiology,2015-01-01,13(6)