globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gbi.12251
Scopus记录号: 2-s2.0-85031503090
论文题名:
Environmental niches and metabolic diversity in Neoarchean lakes
作者: Stüeken E.E.; Buick R.; Anderson R.E.; Baross J.A.; Planavsky N.J.; Lyons T.W.
刊名: Geobiology
ISSN: 1472-4677
EISSN: 1472-4669
出版年: 2017
卷: 15, 期:6
起始页码: 767
结束页码: 783
语种: 英语
Scopus关键词: Archean ; chlorophyll a ; groundwater ; metabolism ; methylation ; niche ; oxygenation ; primary production ; Proterozoic ; sinkhole ; species diversity ; water column ; Florida [United States] ; Sarasota County ; United States
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: The diversification of macro-organisms over the last 500 million years often coincided with the development of new environmental niches. Microbial diversification over the last 4 billion years likely followed similar patterns. However, linkages between environmental settings and microbial ecology have so far not been described from the ancient rock record. In this study, we investigated carbon, nitrogen, and molybdenum isotopes, and iron speciation in five non-marine stratigraphic units of the Neoarchean Fortescue Group, Western Australia, that are similar in age (2.78–2.72 Ga) but differ in their hydro-geologic setting. Our data suggest that the felsic-dominated and hydrologically open lakes of the Bellary and Hardey formations were probably dominated by methanogenesis (δ13Corg = −38.7 ± 4.2‰) and biologic N2 fixation (δ15Nbulk =−0.6 ± 1.0‰), whereas the Mt. Roe, Tumbiana and Kylena Formations, with more mafic siliciclastic sediments, preserve evidence of methanotrophy (δ13Corg as low as −57.4‰, δ13Ccarb as low as −9.2‰) and NH3 loss under alkaline conditions. Evidence of oxygenic photosynthesis is recorded only in the closed evaporitic Tumbiana lakes marked by abundant stromatolites, limited evidence of Fe and S cycling, fractionated Mo isotopes (δ98/95Mo = +0.4 ± 0.4‰), and the widest range in δ13Corg (−57‰ to −15‰), suggesting oxidative processes and multiple carbon fixation pathways. Methanotrophy in the three mafic settings was probably coupled to a combination of oxidants, including O2 and SO4 2-. Overall, our results may indicate that early microbial evolution on the Precambrian Earth was in part influenced by geological parameters. We speculate that expanding habitats, such as those linked to continental growth, may have been an important factor in the evolution of life. © 2017 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/85031
Appears in Collections:影响、适应和脆弱性

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作者单位: School of Earth & Environmental Sciences, University of St Andrews, St Andrews, United Kingdom; Virtual Planetary Laboratory, NASA Astrobiology Institute, University of Washington, Seattle, WA, United States; Department of Earth & Space Sciences, University of Washington, Seattle, WA, United States; Department of Biology, Carleton College, Northfield, MN, United States; School of Oceanography, University of Washington, Seattle, WA, United States; Department of Geology and Geophysics, Yale University, New Haven, CT, United States; Department of Earth Sciences, University of California, Riverside, CA, United States

Recommended Citation:
Stüeken E.E.,Buick R.,Anderson R.E.,et al. Environmental niches and metabolic diversity in Neoarchean lakes[J]. Geobiology,2017-01-01,15(6)
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