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.

传播是一个主要的生活史特征，由许多相互作用的特征组成。 关于扩散模式进化的大多数争论都假设这些性状存在显着的遗传变异，并且与受自然选择影响的其他性状存在遗传共变。 理解扩散模式演变的一个主要困难是无法量化那些有助于扩散潜力的生物参数的个体差异。 在海洋拖鞋蜗牛（Crepidula fornicata）中，控制扩散能力的主要生物特征是自由游动幼虫阶段的持续时间。 Crepidula 的幼虫必须在浮游生物中发育一到几周，然后才能变态为静止的幼体阶段。 现在可以对个体幼虫的这一强制扩散时期进行量化。 我们建议确定与其他幼虫和变态后性状的数量遗传协方差，这些性状先前已被提议影响变态能力和适应性变化的发展。 我们将专门检验这样一个假设：传播能力可能通过其与其他受自然选择影响的性状的遗传相关性而进化。