Collaborative Research: Patterns of Diversity and Faunal Turnover at a Late Cambrian Trilobite Extinction Event: Testing for Phylogenetic, Stratigraphic and Environmental Biases

合作研究：寒武纪晚期三叶虫灭绝事件的多样性和动物区系更替模式：系统发育、地层和环境偏差的测试

• 批准号: 0308685
• 负责人: Jonathan Adrain
• 金额: --
• 依托单位: University of Iowa
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2003
• 资助国家: 美国
• 起止时间: 2003-08-01 至 2008-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0308685&HistoricalAwards=false
• 关键词: Collaborative; Research; Patterns; Diversity; Faunal

Collaborative Research: Patterns of diversity and faunal turnover at a Late Cambrian trilobite extinction event: testing for stratigraphic, environmental and phylogenetic biasesStephen Westrop, Univ. Oklahoma EAR-0309092Jonathan Adrain, Univ. Iowa EAR-0308685ABSTRACTOne of the great challenges of paleontology is to understand mass extinctions in the fossil record - geologically brief episodes in which ecosystems collapsed and biotas were decimated. Paleontologists are becoming increasingly aware that various biases related to physical processes or errors in the classification of fossils can distort the pattern of extinction, or even create the illusion of extinction where none exists. For example, sea level changes influence our perception of extinction events through erosion or non-preservation of fossils in critical intervals of the rock record. Such biases must be stripped away before we can get an accurate estimate of the magnitude of extinction and assess the processes that might be responsible. This project evaluates biases and examines potential extinction mechanisms in the record of Cambrian trilobites, a group of arthropods that were among the dominant animals in marine environments about half-a-billion years ago. The results are likely to throw new light on other mass extinction events, particularly by providing a better understanding of the impact of various biases on our recognition of such events. The project also has a significant educational component through the participation of graduate students at the University of Oklahoma and the University of Iowa.

合作研究：寒武纪晚期三叶虫灭绝事件的多样性和动物群更替模式：地层学、环境和系统发育偏差的测试斯蒂芬·韦斯特罗普，大学。俄克拉荷马州 EAR-0309092Jonathan Adrain，大学。爱荷华州 EAR-0308685 摘要 古生物学面临的巨大挑战之一是了解化石记录中的大规模灭绝——生态系统崩溃和生物群遭到毁灭的地质短暂事件。 古生物学家越来越意识到，与物理过程相关的各种偏见或化石分类中的错误可能会扭曲灭绝的模式，甚至在不存在的情况下造成灭绝的幻觉。 例如，海平面变化通过岩石记录关键区间内的化石侵蚀或不保存而影响我们对灭绝事件的看法。 在我们能够准确估计灭绝的严重程度并评估可能造成灭绝的过程之前，必须消除这种偏见。 该项目评估了寒武纪三叶虫记录中的偏差并研究了潜在的灭绝机制，寒武纪三叶虫是一组节肢动物，大约五亿年前是海洋环境中的优势动物之一。 研究结果可能会给其他大规模灭绝事件带来新的启示，特别是通过更好地理解各种偏见对我们对此类事件的认识的影响。 该项目还通过俄克拉荷马大学和爱荷华大学研究生的参与而具有重要的教育成分。