DOI: 10.1038/s41561-017-0006-3
论文题名: Oxygenation as a driver of the Great Ordovician Biodiversification Event
作者: Edwards C.T. ; Saltzman M.R. ; Royer D.L. ; Fike D.A.
刊名: Nature Geoscience
ISSN: 17520894
出版年: 2017
卷: 10, 期: 12 起始页码: 925
结束页码: 929
语种: 英语
Scopus关键词: aquatic organism
; biodiversity
; Cambrian
; carbon isotope
; cooling
; coral
; isotopic fractionation
; Ordovician
; oxygen
; oxygenation
; Paleozoic
; Phanerozoic
; sea surface temperature
; skeleton
; Animalia
; Anthozoa
英文摘要: The largest radiation of Phanerozoic marine animal life quadrupled genus-level diversity towards the end of the Ordovician Period about 450 million years ago. A leading hypothesis for this Great Ordovician Biodiversification Event is that cooling of the Ordovician climate lowered sea surface temperatures into the thermal tolerance window of many animal groups, such as corals. A complementary role for oxygenation of subsurface environments has been inferred based on the increasing abundance of skeletal carbonate, but direct constraints on atmospheric O2 levels remain elusive. Here, we use high-resolution paired bulk carbonate and organic carbon isotope records to determine the changes in isotopic fractionation between these phases throughout the Ordovician radiation. These results can be used to reconstruct atmospheric O2 levels based on the O2-dependent fractionation of carbon isotopes by photosynthesis. We find a strong temporal link between the Great Ordovician Biodiversification Event and rising O2 concentrations, a pattern that is corroborated by O2 models that use traditional carbon-sulfur mass balance. We conclude that that oxygen levels probably played an important role in regulating early Palaeozoic biodiversity levels, even after the Cambrian Explosion. © 2017 The Author(s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/105659
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 Geological and Environmental Sciences, Appalachian State University, Boone, NC, United States; School of Earth Sciences, Ohio State University, Columbus, OH, United States; Department of Earth and Environmental Sciences, Wesleyan University, Middletown, CT, United States; Department of Earth and Planetary Sciences, Washington University in St. Louis, St. Louis, MO, United States
Recommended Citation:
Edwards C.T.,Saltzman M.R.,Royer D.L.,et al. Oxygenation as a driver of the Great Ordovician Biodiversification Event[J]. Nature Geoscience,2017-01-01,10(12)