globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12189
Scopus记录号: 2-s2.0-85027952879
论文题名:
Planktonic marine iron oxidizers drive iron mineralization under low-oxygen conditions
作者: Field E.K.; Kato S.; Findlay A.J.; MacDonald D.J.; Chiu B.K.; Luther G.W.; 3rd; Chan C.S.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2016
卷: 14, 期:5
起始页码: 499
结束页码: 508
语种: 英语
Scopus关键词: iron derivative ; oxygen ; sea water ; biomineralization ; concentration (composition) ; cyanobacterium ; depositional environment ; geological record ; iron ; marine environment ; microbial activity ; oxygen minimum layer ; photosynthesis ; plankton ; redox conditions ; stratification ; transition zone ; chemistry ; cyanobacterium ; metabolism ; microbiology ; oxidation reduction reaction ; plankton ; Proteobacteria ; sediment ; Cyanobacteria ; Geologic Sediments ; Iron Compounds ; Oxidation-Reduction ; Oxygen ; Plankton ; Proteobacteria ; Seawater ; Chesapeake Bay ; United States ; Cyanobacteria
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: Observations of modern microbes have led to several hypotheses on how microbes precipitated the extensive iron formations in the geologic record, but we have yet to resolve the exact microbial contributions. An initial hypothesis was that cyanobacteria produced oxygen which oxidized iron abiotically; however, in modern environments such as microbial mats, where Fe(II) and O2 coexist, we commonly find microaerophilic chemolithotrophic iron-oxidizing bacteria producing Fe(III) oxyhydroxides. This suggests that such iron oxidizers could have inhabited niches in ancient coastal oceans where Fe(II) and O2 coexisted, and therefore contributed to banded iron formations (BIFs) and other ferruginous deposits. However, there is currently little evidence for planktonic marine iron oxidizers in modern analogs. Here, we demonstrate successful cultivation of planktonic microaerophilic iron-oxidizing Zetaproteobacteria from the Chesapeake Bay during seasonal stratification. Iron oxidizers were associated with low oxygen concentrations and active iron redox cycling in the oxic-anoxic transition zone (<3 μm O2 , <0.2 μm H2 S). While cyanobacteria were also detected in this transition zone, oxygen concentrations were too low to support significant rates of abiotic iron oxidation. Cyanobacteria may be providing oxygen for microaerophilic iron oxidation through a symbiotic relationship; at high Fe(II) levels, cyanobacteria would gain protection against Fe(II) toxicity. A Zetaproteobacteria isolate from this site oxidized iron at rates sufficient to account for deposition of geologic iron formations. In sum, our results suggest that once oxygenic photosynthesis evolved, microaerophilic chemolithotrophic iron oxidizers were likely important drivers of iron mineralization in ancient oceans. © 2016 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/85095
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Geological Sciences, University of Delaware, Newark, DE, USA; School of Marine Science and Policy, University of Delaware, Newark, Lewes, DE, USA

Recommended Citation:
Field E.K.,Kato S.,Findlay A.J.,et al. Planktonic marine iron oxidizers drive iron mineralization under low-oxygen conditions[J]. Geobiology,2016-01-01,14(5)
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