A genetic evaluation of seed dispersal in the neotropical tree Jacaranda copaia (Bignoniaceae)
A genetic evaluation of seed dispersal in the neotropical tree Jacaranda copaia (Bignoniaceae)
复制标题
DOI：
10.1086/491661
复制
发表时间：
2005-11-01
影响因子：
2.9
通讯作者：
Hubbell, SP
中科院分区：
文献类型：
--
作者：
Jones, FA;Chen, J;Hubbell, SP
种子传播是植物生活史的一个重要阶段，但人们对其了解甚少。在这里，我们使用遗传的方法来描述种子传播模式准确地在一个自然种群的新热带树种蓝花楹copaia（紫葳科）。我们使用的微卫星基因型从母体衍生的组织上的水囊，以确定在人口中的所有可能的成年树木的个人是一个给定的种子收集后，它分散的真正来源。风传播的种子被捕获在两个不同的年份在一个大阵列的种子陷阱在一个84公顷的映射面积的热带森林巴罗科罗拉多岛，巴拿马。我们特别感兴趣的是长途跋涉的种子的比例，以及是否有证据表明种子直接传播到空隙中，这是成功招募这种先锋树种所必需的。最大似然程序被用来拟合单组分和多组分扩散核的距离数据。混合模型，具有不同的分布近和远，最适合观察到的扩散距离，虽然在尾部有相当大的不确定性。我们讨论的结果，在不同的机制负责单独的分布附近的成人源和尾部的曲线。
Seed dispersal is a critical but poorly understood life-history stage of plants. Here we use a genetic approach to describe seed dispersal patterns accurately in a natural population of the Neotropical tree species Jacaranda copaia ( Bignoniaceae). We used microsatellite genotypes from maternally derived tissue on the diaspore to identify which individual of all possible adult trees in the population was the true source of a given seed collected after it dispersed. Wind-dispersed seeds were captured in two different years in a large array of seed traps in an 84-ha mapped area of tropical forest on Barro Colorado Island, Panama. We were particularly interested in the proportion of seeds that traveled long distances and whether there was evidence for direct dispersal into gaps, which are required for successful recruitment of this pioneer tree species. Maximum likelihood procedures were used to fit single- and multiple-component dispersal kernels to the distance data. Mixture models, with separate distributions near and far, best fit the observed dispersal distances, albeit with considerable uncertainty in the tail. We discuss the results in light of different mechanisms responsible for separate distributions near the adult source and in the tail of the curve.