Evolutionary Genetic Architecture of Dispersal

扩散的进化遗传结构

• 批准号: 9208014
• 负责人: Thomas Hilbish
• 金额: $ 8万
• 依托单位: University of South Carolina at Columbia
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1992
• 资助国家: 美国
• 起止时间: 1992-12-15 至 1995-05-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9208014&HistoricalAwards=false
• 关键词: Evolutionary; Genetic; Architecture; Dispersal

Dispersal is a major life history characteristic composed of many interacting traits. Most arguments about the evolution of dispersal patterns assume that there is significant genetic variation for these traits and genetically covary with other traits that are influenced by natural selection. A major difficulty in understanding the evolution of dispersal patterns has been the inability to quantify individual differences in those biological parameters contributing to dispersal potential. In the marine slipper snail, Crepidula fornicata, the principal biological trait governing dispersal capacity is the duration of a free-swimming larval stage. Larval of Crepidula must develop in the plankton for one to several weeks before becoming capable of metamorphosing to the sedentary juvenile stage. This period of obligatory dispersal can now be quantified for individual larvae. We propose to determine the quantitative genetic covariance with other larval and post-metamorphic traits that have been previously proposed to influence the development of metamorphic competence and fitness variation. We will specifically test the hypothesis that dispersal capacity may evolve through its genetic correlation with other traits that are subject to natural selection.

扩散是一个主要的生活史特征， 相互作用的特征 大多数关于进化的争论 扩散模式假设存在显著的遗传 这些性状的变异以及与其他性状的遗传协变 受到自然选择的影响。 的一大难点 了解扩散模式的演变 无法量化这些生物学上的个体差异 影响扩散潜力的参数。 在海洋 滑履螺，穹形假捻螺，主要生物学特性， 支配扩散能力的是自由游动的持续时间 幼虫期 Crepidula的幼虫必须在浮游生物中发育， 一至数周后才能变成 久坐不动的幼年期 这段强制性的迁徙时期 现在可以对单个幼虫进行量化。 我们建议 确定与其他幼虫的数量遗传协方差， 先前提出的后变质特征， 影响变态能力和适应性的发展 变化量 我们将特别检验扩散 能力可以通过与其他人的遗传相关性而进化。 受自然选择影响的特征。