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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Climate change and the selective signature of the Late Ordovician mass extinction
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Climate change and the selective signature of the Late Ordovician mass extinction

机译：气候变化与奥陶纪晚期生物大灭绝的选择性特征

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摘要

Selectivity patterns provide insights into the causes of ancient extinction events. The Late Ordovician mass extinction was related to Gondwanan glaciation; however, it is still unclear whether elevated extinction rates were attributable to record failure, habitat loss, or climatic cooling. We examined Middle Ordovician-Early Silurian North American fossil occurrences within a spatiotempo-rally explicit stratigraphic framework that allowed us to quantify rock record effects on a per-taxon basis and assay the interplay of macrostratigraphic and macroecological variables in determining extinction risk. Genera that had large proportions of their observed geographic ranges affected by stratigraphic truncation or environmental shifts at the end of the Katian stage were particularly hard hit. The duration of the subsequent sampling gaps had little effect on extinction risk, suggesting that this extinction pulse cannot be entirely attributed to rock record failure; rather, it was caused, in part, by habitat loss. Extinction risk at this time was also strongly influenced by the maximum paleolatitude at which a genus had previously been sampled, a macroecological trait linked to thermal tolerance. A model trained on the relationship between 16 explanatory variables and extinction patterns during the early Katian interval substantially underestimates the extinction of exclusively tropical taxa during the late Katian interval. These results indicate that glacioeustatic sea-level fall and tropical ocean cooling played important roles in the first pulse of the Late Ordovician mass extinction in Laurentia.
机译：选择性模式可以洞悉古代灭绝事件的原因。奥陶纪晚期大灭绝与冈瓦南冰川化有关。但是，目前尚不清楚灭绝率升高是否归因于记录不足，栖息地丧失或气候变冷。我们在时空-明确的地层学框架内研究了中奥陶纪-志留纪早期的北美化石的发生，这使我们能够在每个分类单元的基础上量化岩石记录的影响，并测定宏观地层学和宏观生态学变量在确定灭绝风险中的相互作用。在Katian阶段末期，由于地层截断或环境变化而影响到的地理范围很大的属受到的打击尤其严重。随后的采样间隔的持续时间对灭绝的风险影响很小，这表明该灭绝脉冲不能完全归因于岩石记录的破坏。而是部分原因是栖息地的丧失。此时的灭绝风险还受到以前采样的最大古纬度的强烈影响，这是与耐热性相关的宏观生态特征。训练了一个模型，该模型研究了在凯迪安早期的16种解释变量与灭绝模式之间的关系，从而大大低估了在凯迪安晚期的仅热带类群的灭绝。这些结果表明冰川稳定的海平面下降和热带海洋冷却在劳伦西亚晚奥陶纪大灭绝的第一个脉冲中起了重要作用。

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    Seth Finnegan; Noel A. Heim; Shanan E. Peters; Woodward W. Fischer;

  • 作者单位

    Division of Geological and Planetary Sciences, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125,Department of Integrative Biology, University of California, 1005 Valley Life Sciences Bldg #3140, Berkeley, CA 94720;

    Department of Geoscience, University of Wisconsin-Madison, 1215 West Dayton Street, Madison, Wl 53706;

    Department of Geoscience, University of Wisconsin-Madison, 1215 West Dayton Street, Madison, Wl 53706;

    Division of Geological and Planetary Sciences, California Institute of Technology, 1200 East California Boulevard, Pasadena, CA 91125;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    climate change; stratigraphy; sea level; Hirnantian; marine; invertebrates;

    机译：气候变化;地层学海平面;海南天;海洋无脊椎动物;

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