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.

分散是由许多相互作用的特征组成的主要生活史特征。 关于分散模式演变的大多数论点都认为，这些特征存在显着的遗传变异，并且与受自然选择影响的其他特征在遗传上有变化。 理解分散模式的演变的主要困难是无法量化有助于分散潜力的生物学参数的个体差异。 在海洋拖鞋蜗牛，crepidula fornicata中，主管分散能力的主要生物特质是自由速wim虫幼虫阶段的持续时间。 在浮桥中，必须在浮游生物中发育一到几周，才能变成久坐的少年阶段。 现在，可以为个别幼虫量化这一必需的分散时期。 我们建议确定与其他幼虫和后变性性状的定量遗传协方差，这些特征先前曾提出影响变质能力和适应性变异的发展。 我们将特别检验以下假设，即分散能力可能通过其与其他受自然选择的特征相关性而发展。