CRB: Predicting the Genetic Consequencies of the Fragmentation of Tropical Tree Populations

9610275 Hamrick拟议的研究将测量与三个新热带树种，Enterolobium cyclocarpum，Hymenaea courbaril和Spondias mombin种群的繁殖结构有关的几个因素。 这三个物种是由不同的传粉者授粉，有不同的种子传播机制，并发生在非常不同的人口密度。研究中心将位于巴拿马巴罗科罗拉多自然保护区和哥斯达黎加帕洛韦尔迪国家公园附近的受干扰和相对未受干扰的栖息地。 在每个站点的几个成年树的后代的遗传分析将被用来确定男性和女性生殖成功的相对水平，花粉和种子移动到每个人口和每个人口内的成人的遗传相关性的水平。 这些数据将用于确定在受干扰生境中的小的分散种群是否可能丧失遗传多样性或将遭受近亲繁殖率增加的后果。预期的结果应证明有助于管理受干扰的生境，以最大限度地增加物种多样性和遗传多样性，并有助于恢复森林生境。

9610275 Hamrick The proposed research will measure several factors involved with the breeding structure of populations of three Neotropical tree species, Enterolobium cyclocarpum, Hymenaea courbaril and Spondias mombin. These three species are pollinated by different pollinators, have different seed dispersal mechanisms and occur at very different population densities. Study sites will be located in disturbed and relatively undisturbed habitats located in the vicinity of Barro Colorado Nature Monument, Panama and Palo Verde National Park, Costa Rica. Genetic analyses of the progeny of several adult trees in each site will be used to determine relative levels of male and female reproductive success, levels of pollen and seed movement into each population and the genetic relatedness of the adults within each population. These data will be used to determine whether the small fragmented populations in disturbed habitats are likely to lose genetic diversity or will suffer the consequences of increased rates of inbreeding. The expected results should prove useful for managing disturbed habitats to maximize species diversity and genetic diversity and for the restoration of forest habitats.