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

拟议的研究将测量与三种新热带树种——环状肠虫（Enterolobium cyclocarpum）、葫芦膜虫（Hymenaea courbaril）和mombin——种群繁殖结构有关的几个因素。这三种植物由不同的传粉媒介授粉，具有不同的种子传播机制，种群密度也大不相同。研究地点将位于受干扰和相对未受干扰的栖息地，这些栖息地位于巴拿马的巴罗科罗拉多自然纪念碑和哥斯达黎加的帕洛阿尔维德国家公园附近。对每个地点几棵成年树后代的遗传分析将用于确定雄性和雌性繁殖成功率的相对水平，花粉和种子进入每个种群的水平以及每个种群中成年树的遗传相关性。这些数据将被用来确定在受干扰的栖息地中的小种群是否可能失去遗传多样性，或者是否会遭受近亲繁殖率增加的后果。预期的结果应证明对管理受干扰的生境以最大限度地提高物种多样性和遗传多样性以及恢复森林生境是有用的。

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.