Direct Assessment of Natural Selection in a Hybrid Zone

混合区自然选择的直接评估

基本信息

批准号：
9509742
负责人：
Thomas Hilbish
金额：
$ 9万
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：
1995
资助国家：
美国
起止时间：
1995-09-01 至 1997-02-28
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=9509742&HistoricalAwards=false
关键词：
Direct Assessment Natural Selection Hybrid

项目摘要

9509742 Hilbish The dynamics of hybrid zones consist of two major elements; the dispersal of parent species and their hybrids into and out of the zone, and their differential survival and reproduction. Strong selection operates within hybrid populations of marine mussels species capable of large-scale dispersal. The objectives of the work proposed here is two-fold. First, the hypothesis that selection in the hybrid zone is determined by the environment will be tested and potential selective agents identified. Second, the patterns of larval dispersal across a portion of the hybrid zone will be described. This will serve to identify the geographic and genetic origin of larvae that immigrate to hybrid populations and are subsequently subjected to selection. Four hypotheses will be examined to understand the role of specific environmental factors in selection among hybrid genotypes. These studies will determine the coincidence of each environmental stress with onset and duration of natural selection. These studies will provide the basis for specific laboratory and field-experimental tests of potential selective agents in future studies. Second, molecular genetic techniques, developed with previous NSF support, will be used to determine the origin of larval populations that recruit into hybrid populations. This information will provide a foundation upon which to interpret the patterns of selection observed within hybrid populations and potentially the fate of hybrid larvae once they disperse out of the hybrid zone back into one of the parental populations.

9509742 Hilbish混合区的动力学由两个主要要素组成；父母物种及其杂种进入区域的分散以及它们的生存差异和繁殖。强有力的选择在能够大规模分散的海洋贻贝物种的混合种群中运行。这里提出的工作的目标是两个方面。首先，将测试环境确定的杂种区域中的选择并确定潜在的选择性剂的假设。其次，将描述跨杂种区域一部分的幼虫分散模式。这将有助于确定幼虫的地理和遗传来源，这些幼虫移民到杂种种群，随后被选择。将检查四个假设，以了解特定环境因素在混合基因型中选择中的作用。这些研究将确定每种环境应力与自然选择的持续时间的巧合。这些研究将为未来研究中潜在选择性药物的特定实验室和现场实验性测试提供基础。其次，将使用以前的NSF支持开发的分子遗传技术将用于确定招募杂种种群的幼虫种群的起源。该信息将为解释在混合人群中观察到的选择模式的基础，一旦将杂种幼虫分散到混合区域中，可能是杂种幼虫的命运，回到了一个父母种群中。