DISSERTATION RESEARCH: Macroevolutionary Consequences of Abundance in Paleogene Bivalves

论文研究：古近纪双壳类丰富的宏观进化后果

• 批准号: 0607922
• 负责人: David Jablonski
• 金额: $ 1.16万
• 依托单位: University of Chicago
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-08-15 至 2009-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0607922&HistoricalAwards=false
• 关键词: DISSERTATION; RESEARCH; Macroevolutionary; Consequences; Abundance

Determining the relative influences of species' ecological characteristics on extinction and origination rates is critical in understanding the generation and maintenance of biodiversity. One factor widely believed to influence evolutionary rates is the abundance of individuals within species. This study tests whether abundance accurately predicts evolutionary rates in three superfamilies of marine bivalves during their recovery and diversification following the end-Cretaceous mass extinction (65-30 million years ago). Because abundance covaries with other biological characteristics believed to influence evolutionary rates, a multivariate statistical approach is being used to determine the direct and indirect contributions of abundance to macroevolutionary patterns. Data for this study are being gathered through fieldwork in the U.S. Gulf Coastal Plain and the use of existing paleontological collections.This study will provide the first test of the relative influences of multiple biological characteristics on evolutionary rates in marine ecosystems over geologic time scales. The results will advance understanding of evolutionary dynamics and will inform predictions of the sensitivities of species to current environmental change. An extensive collection of fossil material will be gathered for this study and resulting data will be available for future research via the Paleobiology Database. Research results and approaches will be disseminated to students and the general public through outreach programs in coastal plain and south side Chicago communities.

确定物种的生态特征对灭绝和起源速率的相对影响对于理解生物多样性的产生和维持至关重要。人们普遍认为影响进化速度的一个因素是物种内个体的丰度。这项研究测试是否丰富准确地预测在三个超家庭的海洋双壳类在其恢复和多样化后，白垩纪末大规模灭绝（65-30万年前）的进化速率。由于丰度与其他生物学特性的协变被认为会影响进化速率，多元统计方法被用来确定丰度的直接和间接贡献的宏观进化模式。这项研究的数据是通过在美国墨西哥湾沿岸平原的实地考察和使用现有的古生物学collections.This研究将提供在地质时间尺度上的海洋生态系统的进化速率的多个生物特征的相对影响的第一个测试。这些结果将促进对进化动力学的理解，并将为预测物种对当前环境变化的敏感性提供信息。这项研究将收集大量的化石材料，所得数据将通过古生物学数据库供未来研究使用。研究结果和方法将通过在沿海平原和芝加哥南部社区的外展计划传播给学生和公众。