Phylogenetic and Morphometric Examinations of Evolutionary Dynamics Among Early - Middle Devonian Gastropods

早中泥盆世腹足动物进化动力学的系统发育和形态测量

• 批准号: 9903238
• 负责人: Peter Wagner
• 金额: $ 7.25万
• 依托单位: Field Museum of Natural History
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-08-01 至 2004-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9903238&HistoricalAwards=false
• 关键词: Phylogenetic; Morphometric; Examinations; Evolutionary; Dynamics

9903238WagnerThis study will derive estimates of relationships among Early-Middle Devonian gastropod species and quantify morphologic variation among those species. The study will examine trends in two key features associated with "modernization" of gastropods: 1) the increased diversity of species bearing shell ornament and 2) the decreased diversity of nearly-flat shelled species. The study will test several hypotheses concerning thetiming and biological-level of those trends, including 1) hypotheses attributing the patterns to the diversification of jawed fishes and other predators, and 2) hypotheses attributing trends to changes in extinction/speciation dynamics vs. those attributing trends to shifts in morphologic evolution.

9903238 Wagner本研究将得出早中泥盆世腹足类物种之间的关系的估计，并量化这些物种之间的形态变化。 该研究将研究与腹足类“现代化”相关的两个关键特征的趋势：1）带壳装饰的物种多样性增加，2）近平壳物种多样性减少。 本研究将检验几种关于这些趋势的时间和生物水平的假设，包括1）将这些模式归因于有颌鱼类和其他捕食者的多样化的假设，2）将趋势归因于灭绝/物种形成动态变化的假设与将趋势归因于形态进化变化的假设。