Abstract

The black locust Robinia pseudoacacia (Robinieae, Fabaceae) is a common invasive riparian tree in Japan. There are less effective management strategies to remove the tree from the riparian area because of its quickly established high population. We investigated the expansion patterns of R. pseudoacacia through sympatric (i.e. between high- and low-water channel (HWC/LWC) within a study site) and allopatric (i.e. along river corridor) dispersal in the Tama River (Tokyo, Japan). Four microsatellites were used to examine the effects of gene flow on six populations in three sites. These subpopulations showed small genetic distance (i.e. no barrier or slightly limited) and genetically mixed population structure. It indicated that both sympatric and allopatric dispersals were active. Many migrants were younger individuals (i.e. <5 years old) and were found in the LWC area. Thus, the LWC could receive more migrants than the HWC through both types of dispersals. In addition, our age and genetic structure analyses reveal that recruited individuals likely settled immediately after the clearing project of R. pseudoacacia through sympatric dispersal. It appears that the migration by allopatric dispersal occurred following this. For the effective management of R. pseudoacacia, migrants should be removed regularly following initial removal of invaders during site restoration.

中文翻译：

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入侵树刺槐刺槐的空间遗传结构，以确定迁移模式，以指导河岸恢复的最佳实践

摘要

黑刺槐刺槐（Robinieae，Fabaceae）是日本常见的入侵河岸树。由于树木数量很快，因此从河岸地区清除树木的管理策略不太有效。我们调查了R. pseudoacacia的扩展模式通过同胞（在研究地点内的高水位和低水位之间的通道（HWC / LWC）之间）和异特异的（即沿河道）扩散到多摩河（日本东京）中。使用四个微卫星来检查基因流对三个位置的六个种群的影响。这些亚群显示出较小的遗传距离（即无障碍或略有限制）和遗传上混合的种群结构。这表明同位和异相分散均很活跃。许多移徙者是较年轻的个体（即<5岁），并在轻武器区发现。因此，通过这两种类型的散布，轻工与轻工相比可以接收更多的移民。此外，我们的年龄和遗传结构分析显示，被招募的个体很可能在拟金合欢清除项目结束后立即定居。通过同胞传播。看来在此之后发生了通过异相分散的迁移。为了有效处理伪阿拉伯树念珠菌，应在现场恢复期间初步清除侵略者后定期移走移居者。