Evolutionary Dynamics of a Plant Hybrid Zone

小坎贝尔9407144 本研究的主要目的是测试模型的植物杂交区的维护。 沿着杂交带的沿着倾斜可以用几种不同的选择机制来解释。 这些模型的直接测试将在2种开花植物Ipomopsis aggregata和I. tenuituba。 这项研究有两个主要目标。 第一个目标是描述选择的总体形式，以区分所提出的模型。 控制杂交将用于产生杂交种子，然后通过相互移植来确定亲本物种和后代杂交种在沿着杂交区的几个地点的相对适合度。 第二个目标是确定直接对那些表现出渐变的花性状进行选择的形式和机制。 将使用定量、分子和观测方法来实现第二个目标。

9407144 Campbell The main purpose of this research is to test models for the maintenance of plant hybrid zones. Clines along hybrid zones can be explained by several mechanisms that differ in the form of selection. Direct tests of these models will be conducted in a hybrid zone between 2 flowering plants, Ipomopsis aggregata and I. tenuituba. The study has two major goals. The first goal is to characterize the overall form of selection to distinguish among the proposed models. Controlled crosses will be used to produce hybrid seed, followed by reciprocal transplants to determine relative fitness of parental species and offspring hybrids at several sites along the hybrid zone. The second goal is to determine the form and mechanism of selection directly on those floral traits that exhibit clines. Quantitative, molecular and observational methods will be used to address this second goal.