Abstract：
Population genetic structure is strongly affected by dispersal events, especially for migratory species. The investigation of population structure is therefore conducive to increasing our understanding of species dispersal. Spodoptera litura (Fabricius) (Lepidoptera: Noctuidae) is an important tobacco pest in China causing serious damage to multiple crops. In this study, we explore its dispersal dynamics by clarifying the fine-scale population genetics using 545 S. litura samples collected from tobacco plantations at 24 locations (mainly in Baise, Hechi, and Hezhou, Southern China). We analyzed the genetic diversity, genetic structure, and gene flow of these populations using seven microsatellite loci. Our results revealed high genetic diversity and low population genetic structure among S. litura. The genetic distance was uncorrelated with geographical distance, indicating the complete randomness of dispersal among the local populations. Our results suggest that the movement scope of contemporary S. litura might be much higher than the local-level spatial scale, which will provide a theoretical basis for pest management.
摘要：
种群遗传结构受到扩散事件的强烈影响，尤其是迁徙物种。因此，对种群结构的调查有助于增进我们对物种扩散的了解。斜纹夜蛾(Lepidoptera:Noctuidae)是我国一种重要的烟草害虫,对多种作物造成严重危害。在这项研究中,我们通过使用从24个地点的烟草种植园收集的545个伊图拉丝虫样本来阐明其精细尺度的种群遗传学来探索其扩散动力学（主要在百色，河池,和贺州,中国南方）。我们分析了遗传多样性，遗传结构,以及使用七个微卫星基因座的这些种群的基因流。我们的结果表明，斜纹夜蛾的遗传多样性高，种群遗传结构低。遗传距离与地理距离无关，表明在当地人群中扩散的完全随机性。我们的结果表明，当代斜纹夜蛾的运动范围可能远高于当地水平的空间尺度，为病虫害防治提供理论依据。
