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: 0309092
• 负责人: Stephen Westrop
• 金额: --
• 依托单位: University of Oklahoma Norman Campus
• 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=0309092&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.

协作研究：寒武纪三叶虫灭绝事件的多样性和动物流动模式：地层，环境和系统发育偏见的测试，Univ。俄克拉荷马州EAR-0309092JONATHAN ADRAIN，UNIV。爱荷华州EAR​​ -0308685ABSTRACTONE面临的巨大挑战是了解化石记录中的大规模灭绝 - 地质上的简短发作，生态系统崩溃并削弱了生物。 古生物学家越来越意识到，与化石分类中的物理过程或错误相关的各种偏见会扭曲灭绝模式，甚至会在不存在的情况下产生灭绝的幻觉。 例如，海平面变化会影响我们通过岩石记录的关键间隔侵蚀或不保护化石对灭绝事件的看法。 在我们获得灭绝程度的准确估计并评估可能负责的过程之前，必须将这种偏差剥离。 该项目评估了偏见，并检查了寒武纪三叶树记录中的潜在灭绝机制，寒武纪三叶虫是一组节肢动物，它们是海洋环境中大约50万年前的主要动物之一。 结果可能会给其他大规模灭绝事件提供新的启示，尤其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的研究生参与而具有重要的教育成分。