Collaborative Research: Spatially and Temporally Explicit Breeding Structure Analyses for a Tropical Dry-Forest Tree Species, Enterolobium cyclocarpum

小鼠对自然景观的改变可以对种群密度和生物的空间分布产生深远的影响，从而极大地改变自然繁殖模式。两项新的遗传分析将研究位于哥斯达黎加瓜纳卡斯特省的热带干林树种环瘤肠杆菌的自然和人工改良种群繁殖模式的空间和时间变化。1995年以来的种子收集为这些分析提供了一个独特的时间层面。对该物种授粉生态的研究将补充遗传分析，从而对遗传数据进行更明智的解释。这项研究有几个更广泛的影响。首先，它将确定人类引起的栖息地改变是否显著地改变了热带树木的繁殖模式，以至于无法维持自然水平的遗传多样性。其次，时间分析将证明对少数繁殖事件的研究是否足以描述长寿树的繁殖模式。这些综合研究还应有助于制定有效的景观管理计划，考虑到自然繁殖种群的空间范围。最后，两种遗传分析的比较应该确定资源需求较少的方法是否可靠地估计育种参数。如果是这样的话，这可能为在多种植物物种中研究花粉移动模式的景观水平提供一个重大突破。

0211430Smouse Changes to natural landscapes can have profound effects on population densities and spatial distributions of organisms, greatly modifying natural breeding patterns. Two novel genetic analyses will examine spatial and temporal variation in the breeding patterns of natural and human-modified populations of the tropical dry-forest tree, Enterolobium cyclocarpum, located in Guanacaste Province, Costa Rica. The availability of seed collections dating from 1995 provides a unique temporal dimension to these analyses. Studies of the pollination ecology of this species will supplement the genetic analyses allowing more informed interpretations of the genetic data.This research has several broader impacts. First, it will determine if human-induced habitat modifications significantly modify breeding patterns of tropical trees to such an extent that natural levels of genetic diversity can't be maintained. Second, temporal analyses will demonstrate whether studies of a few reproductive events adequately describe breeding patterns of a long-lived tree. These comprehensive studies should also assist the development of effective landscape management plans that consider the spatial extent of natural breeding populations. Finally, comparisons of the two genetic analyses should determine whether the less resource-demanding approach dependably estimates breeding parameters. If so, this could provide a major breakthrough for landscape-level studies of pollen movement patterns in a wide variety of plant species.