Ecological Determinants of Genetic Structure in a Plant Meta-population

植物集合种群遗传结构的生态决定因素

• 批准号: 9221175
• 负责人: David McCauley
• 金额: $ 19.28万
• 依托单位: Vanderbilt University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1993
• 资助国家: 美国
• 起止时间: 1993-03-01 至 1997-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9221175&HistoricalAwards=false
• 关键词: Ecological; Determinants; Genetic; Structure; Plant

Meta-populations are populations which are subdivided into many ephemeral, weakly interacting subcomponents. The genetic properties of metapopulations are determined, in large part, by genetic processes accompanying the extinction and recolonization of the local subcomponents. These processes have been the subject of recent theoretical analysis but are not well studied in nature. This study will investigate the population genetic properties of a meta-population of Silene alba, an herbaceous plant that has been the subject of the detailed, long-term demographic analysis required as background data for the study of meta-populations. The basic question to be asked in this project is whether the repeated extinction and recolonization of local demes acts to increase or to diminish genetic differentiation, relative to a similarly subdivided population but without extinction and recolonization. The work will include studies of the genetic properties of the meta-population, additional demographic studies geared towards understanding mechanisms of gene flow, and extension of the theoretical models. Experimental studies of pollen and seed flow, and recruitment from the seed bank, will evaluate sources of gene flow, both into established populations and as part of the process by which new populations are established. Extension of theory will be guided, in part, by the results of the empirical work. //

元种群是被细分为许多短暂的、弱相互作用的子成分的种群。元种群的遗传特性在很大程度上是由伴随局部子组分灭绝和重新定殖的遗传过程决定的。这些过程是最近理论分析的主题，但在本质上没有得到很好的研究。本研究将调查白硅烯（Silene alba）一个元群体的群体遗传特性，白硅烯是一种草本植物，一直是元群体研究所需的详细、长期人口统计学分析的主题。在这个项目中要问的基本问题是，相对于一个相似的细分群体，没有灭绝和再殖民化的情况下，局部demes的重复灭绝和再殖民化是增加还是减少了遗传分化。这项工作将包括研究元人口的遗传特性，进一步的人口统计学研究，以了解基因流动的机制，并扩展理论模型。花粉和种子流动的实验研究，以及种子库的招募，将评估基因流动的来源，既进入已建立的种群，也作为新种群建立过程的一部分。理论的扩展部分将由实证工作的结果来指导。//