Pollen flow in fragmented landscapes maintains genetic diversity following stand-replacing disturbance in a neotropical pioneer tree, Vochysia ferruginea Mart.

In forests with gap disturbance regimes, pioneer tree regeneration is typically abundant following stand-replacing disturbances, whether natural or anthropogenic. Differences in pioneer tree density linked to disturbance regime can influence pollinator behaviour and impact on mating patterns and genetic diversity of pioneer populations. Such mating pattern shifts can manifest as higher selfing rates and lower pollen diversity in old growth forest populations. In secondary forest, where more closely related pollen donors occur, an increase in biparental inbreeding is a potential problem. Here, we investigate the consequences of secondary forest colonisation on the mating patterns and genetic diversity of open-pollinated progeny arrays for the long-lived, self-compatible pioneer tree, Vochysia ferruginea, at two Costa Rican sites. Five microsatellite loci were screened across adult and seed cohorts from old growth forest with lower density, secondary forest with higher density, and isolat...在具有林隙干扰制度（gap disturbance regime）的森林中，无论为自然干扰还是人为干扰，全林分干扰（stand-replacing disturbance）后先锋树种（pioneer tree）的更新通常极为旺盛。与干扰制度相关的先锋树种密度差异，可影响传粉者行为，并进而影响先锋种群的交配模式与遗传多样性（genetic diversity）。这类交配模式的转变，可表现为原始林（old-growth forest）种群中更高的自交率与更低的花粉多样性。在存在更多亲缘关系密切的花粉供体的次生林（secondary forest）中，双亲近交（biparental inbreeding）水平升高是一个潜在问题。本研究以哥斯达黎加两个样地中的长寿命、自交亲和（self-compatible）先锋树种Vochysia ferruginea为研究对象，探讨次生林定植对其开放授粉子代群体（open-pollinated progeny array）的交配模式与遗传多样性的影响。研究人员针对低密度原始林、高密度次生林以及隔离（原文截断为isolat...）的成年个体与种子队列，筛选了5个微卫星位点（microsatellite locus）。