globalchange  > 气候减缓与适应
DOI: 10.1038/ngeo1679
论文题名:
Bioavailability of zinc in marine systems through time
作者: Scott C.; Planavsky N.J.; Dupont C.L.; Kendall B.; Gill B.C.; Robbins L.J.; Husband K.F.; Arnold G.L.; Wing B.A.; Poulton S.W.; Bekker A.; Anbar A.D.; Konhauser K.O.; Lyons T.W.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2013
卷: 6, 期:2
起始页码: 125
结束页码: 128
语种: 英语
Scopus关键词: bioavailability ; concentration (composition) ; dissolved load ; divergence ; eukaryote ; euxinic environment ; hydrothermal system ; protein ; Proterozoic ; redox conditions ; seawater ; shale ; temporal analysis ; trace metal ; zinc ; Eukaryota
英文摘要: The redox state of the oceans strongly influences the concentration of dissolved trace metals in sea water. Changes in the redox state of the oceans are thought to have limited the availability of some trace metals in the past, particularly during the Proterozoic eon, 2,500 to 542 million years ago. Of these trace metals, zinc (Zn) is of particular importance to eukaryotic organisms, because it is essential for a wide range of basic cellular functions. It has been suggested that during the Proterozoic, marine environments were broadly euxinic - that is, anoxic and sulphidic - which would have resulted in low Zn availability. Low Zn bioavailability could therefore be responsible for an observed delay in eukaryote diversification. Here we present a compilation of Zn abundance data from black shales deposited under euxinic conditions from the Precambrian time to the present. We show that these values track first-order trends in seawater Zn availability. Contrary to previous estimates, we find that Zn concentrations during the Proterozoic were similar to modern concentrations, supporting recent studies that call for limited euxinia at this time. Instead, we propose that predominantly anoxic and iron-rich deep oceans, combined with large hydrothermal fluxes of Zn, maintained high levels of dissolved Zn throughout the oceans. We thus suggest that the protracted diversification of eukaryotic Zn-binding proteins was not a result of Znbiolimitation. © 2013 Macmillan Publishers Limited. All rights reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/106868
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 Earth Sciences, University of California, Riverside, CA 92521, United States; Department of Earth and Planetary Sciences, McGill University, Montreal, QC H3A 2A7, Canada; Microbial and Environmental Genomics Group, J. Craig Venter Institute, San Diego, CA 92121, United States; School of Earth and Space Exploration, Arizona State University, PO Box 871404, Tempe, AZ 85287, United States; Department of Earth and Environmental Sciences, University of Waterloo, Waterloo, ON N2L 3G1, Canada; Department of Geosciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, United States; Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, AB T6G 2E3, Canada; School of Earth and Environment, University of Leeds, Leeds LS2 9JT, United Kingdom; Max Planck Institute for Marine Microbiology, 28359 Bremen, Germany; Department of Geological Sciences, University of Manitoba, Winnipeg, MB R3T 2N2, Canada; Department of Chemistry and Biochemistry, Arizona State University, Tempe, AZ 85287, United States

Recommended Citation:
Scott C.,Planavsky N.J.,Dupont C.L.,et al. Bioavailability of zinc in marine systems through time[J]. Nature Geoscience,2013-01-01,6(2)
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