DOI: 10.1111/gbi.12083
Scopus记录号: 2-s2.0-84898872545
论文题名: Magnetite formation from ferrihydrite by hyperthermophilic archaea from Endeavour Segment, Juan de Fuca Ridge hydrothermal vent chimneys
作者: Jennifer Lin T. ; Breves E.A. ; Dyar M.D. ; Ver Eecke H.C. ; Jamieson J.W. ; Holden J.F.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2014
卷: 12, 期: 3 起始页码: 200
结束页码: 211
语种: 英语
Scopus关键词: Archaea
; Hyperthermus
; Pyrodictium
; ferric hydroxide
; ferric ion
; iron
; magnetite
; sulfide
; chemistry
; growth, development and aging
; hydrothermal vent
; metabolism
; microbiology
; microphotography
; Mossbauer spectroscopy
; oxidation reduction reaction
; Pacific Ocean
; Pyrodictiaceae
; Ferric Compounds
; Ferrosoferric Oxide
; Hydrothermal Vents
; Iron
; Oxidation-Reduction
; Pacific Ocean
; Photomicrography
; Pyrodictiaceae
; Spectroscopy, Mossbauer
; 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: Hyperthermophilic iron reducers are common in hydrothermal chimneys found along the Endeavour Segment in the northeastern Pacific Ocean based on culture-dependent estimates. However, information on the availability of Fe(III) (oxyhydr) oxides within these chimneys, the types of Fe(III) (oxyhydr) oxides utilized by the organisms, rates and environmental constraints of hyperthermophilic iron reduction, and mineral end products is needed to determine their biogeochemical significance and are addressed in this study. Thin-section petrography on the interior of a hydrothermal chimney from the Dante edifice at Endeavour showed a thin coat of Fe(III) (oxyhydr) oxide associated with amorphous silica on the exposed outer surfaces of pyrrhotite, sphalerite, and chalcopyrite in pore spaces, along with anhydrite precipitation in the pores that is indicative of seawater ingress. The iron sulfide minerals were likely oxidized to Fe(III) (oxyhydr) oxide with increasing pH and Eh due to cooling and seawater exposure, providing reactants for bioreduction. Culture-dependent estimates of hyperthermophilic iron reducer abundances in this sample were 1740 and 10 cells per gram (dry weight) of material from the outer surface and the marcasite-sphalerite-rich interior, respectively. Two hyperthermophilic iron reducers, Hyperthermus sp. Ro04 and Pyrodictium sp. Su06, were isolated from other active hydrothermal chimneys on the Endeavour Segment. Strain Ro04 is a neutrophilic (pHopt 7-8) heterotroph, while strain Su06 is a mildly acidophilic (pHopt 5), hydrogenotrophic autotroph, both with optimal growth temperatures of 90-92 °C. Mössbauer spectroscopy of the iron oxides before and after growth demonstrated that both organisms form nanophase (<12 nm) magnetite [Fe3O4] from laboratory-synthesized ferrihydrite [Fe10O14(OH)2] with no detectable mineral intermediates. They produced up to 40 mm Fe2+ in a growth-dependent manner, while all abiotic and biotic controls produced <3 mm Fe2+. Hyperthermophilic iron reducers may have a growth advantage over other hyperthermophiles in hydrothermal systems that are mildly acidic where mineral weathering at increased temperatures occurs. © 2014 John Wiley & Sons Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/85194
Appears in Collections: 影响、适应和脆弱性
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作者单位: Department of Microbiology, University of Massachusetts, Amherst, MA, United States; Department of Astronomy, Mount Holyoke College, South Hadley, MA, United States; Department of Earth Sciences, University of Ottawa, Ottawa, ON, Canada; Department of Biology, Metropolitan State University of Denver, Denver, CO 80217, United States; Helmholtz Centre for Ocean Research, GEOMAR, Kiel D-24148, Germany
Recommended Citation:
Jennifer Lin T.,Breves E.A.,Dyar M.D.,et al. Magnetite formation from ferrihydrite by hyperthermophilic archaea from Endeavour Segment, Juan de Fuca Ridge hydrothermal vent chimneys[J]. Geobiology,2014-01-01,12(3)