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Collaborative Research: Evolutionary Genetic Architecture of Dispersal

合作研究：扩散的进化遗传结构

基本信息

批准号：
9208149
负责人：
Jan Pechenik
金额：
$ 4.07万
依托单位：
Tufts University
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：
1992-09-01 至 1995-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9208149&HistoricalAwards=false
关键词：
Collaborative Research Evolutionary Genetic Architecture

项目摘要

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 that they covary genetically with other traits 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. The study will 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, and will specifically test the hypothesis that dispersal capacity may evolve through its genetic correlation with other traits that are subject to natural selection. The study will contribute to the increased understanding of the biology of marine shellfish populations, and populations of other intertidal and estuarine species.

扩散是一个主要的生活史特征，由许多相互作用的特征组成。大多数关于扩散模式进化的争论都假设这些性状存在显着的遗传变异，并且它们与其他受自然选择影响的性状在遗传上是相同的。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。在海洋拖鞋蜗牛中，支配扩散能力的主要生物学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个星期，才能蜕变到久坐的幼虫阶段。现在可以对单个幼虫的这一强制性散布时期进行量化。这项研究将确定与其他幼虫和变态后性状的数量遗传协方差，这些性状以前被认为会影响变态能力和适合度变异的发展，并将具体检验扩散能力可能通过与其他受自然选择影响的性状的遗传相关性而进化的假设。这项研究将有助于增进对海洋贝类种群以及其他潮间带和河口物种种群生物学的了解。