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.

确定物种生态特征对灭绝和起源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。人们普遍认为会影响进化率的一个因素是物种中的个人丰度。这项研究测试了丰度是否准确预测海洋双壳类超级家族的进化率在终质质量灭绝之后的恢复和多元化期间（65-30万年前）。由于具有据信影响进化率的其他生物学特征的丰度协方差，因此一种多元统计方法被用来确定丰度对宏观进化模式的直接和间接贡献。这项研究的数据是通过美国墨西哥湾沿海平原的实地调查收集的，并使用了现有的古生物学收集。这项研究将对多种生物学特征对海洋生态系统进化率的相对影响进行首次测试。结果将提高人们对进化动力学的了解，并将为物种对当前环境变化的敏感性提供预测。将收集大量的化石材料来进行这项研究，并通过古生物学数据库可用于未来的研究。研究结果和方法将通过芝加哥沿海地区和南侧社区的外展计划将学生和公众传播。