DOI: 10.1038/ngeo2327
论文题名: Modulation of oxygen production in Archaean oceans by episodes of Fe(II) toxicity
作者: Swanner E.D. ; Mloszewska A.M. ; Cirpka O.A. ; Schoenberg R. ; Konhauser K.O. ; Kappler A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2015
卷: 8, 期: 2 起始页码: 126
结束页码: 130
语种: 英语
Scopus关键词: Archean
; growth rate
; iron
; marine pollution
; microbial activity
; oxidation
; photoautotrophy
; plankton
; seamount
; submarine volcano
; surface water
; upwelling
; volcanism
; water column
; Cyanobacteria
; Photobacteria
英文摘要: Oxygen accumulated in the surface waters of the Earth's oceans and atmosphere several hundred million years before the Great Oxidation Event between 2.4 and 2.3 billion years ago. Before the Great Oxidation Event, periods of enhanced submarine volcanism associated with mantle plume events supplied Fe(II) to sea water. These periods generally coincide with the disappearance of indicators of the presence of molecular oxygen in Archaean sedimentary records. The presence of Fe(II) in the water column can lead to oxidative stress in some organisms as a result of reactions between Fe(II) and oxygen that produce reactive oxygen species. Here we test the hypothesis that the upwelling of Fe(II)-rich, anoxic water into the photic zone during the late Archaean subjected oxygenic phototrophic bacteria to Fe(II) toxicity. In laboratory experiments, we found that supplying Fe(II) to the anoxic growth medium housing a common species of planktonic cyanobacteria decreased both the efficiency of oxygenic photosynthesis and their growth rates. We suggest that this occurs because of increasing intracellular concentrations of reactive oxygen species. We use geochemical modelling to show that Fe(II) toxicity in conditions found in the late Archaean photic zone could have substantially inhibited water column oxygen production, thus decreasing fluxes of oxygen to the atmosphere. We therefore propose that the timing of atmospheric oxygenation was controlled by the timing of submarine, plume-type volcanism, with Fe(II) toxicity as the modulating factor. © 2015 Macmillan Publishers Limited. All rights reserved Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106374
Appears in Collections: 气候减缓与适应 科学计划与规划
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作者单位: Department of Geosciences, University of Tübingen, Tübingen, Germany; Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB, Canada
Recommended Citation:
Swanner E.D.,Mloszewska A.M.,Cirpka O.A.,et al. Modulation of oxygen production in Archaean oceans by episodes of Fe(II) toxicity[J]. Nature Geoscience,2015-01-01,8(2)