Genetic structure and inferences on potential source areas for the invasive oriental fruit fly Bactrocera dorsalis (Hendel) based on mitochondrial and microsatellite markers

Bactrocera dorsalis (Diptera: Tephritidae) is mainly distributed in tropical and subtropical Asia and in the Pacific region. Despite its economic importance, very few studies have addressed the question of the wide genetic structure and potential source area of this species. This pilot study attempts to infer the native region of this pest and its colonization pathways in Asia. Combining mitochondrial and microsatellite markers, we evaluated the level of genetic diversity, genetic structure, and the gene flow among fly populations collected across Southeast Asia and China. A complex and significant genetic structure corresponding to the geographic pattern was found with both types of molecular markers. However, the genetic structure found was rather weak in both cases, and no pattern of isolation by distance was identified. Multiple long-distance dispersal events and miscellaneous host selection by this species may explain the results. These complex patterns may have been influenced by ...

橘小实蝇（Bactrocera dorsalis，双翅目：实蝇科）主要分布于亚洲热带、亚热带地区及太平洋区域。尽管该物种具有重要经济价值，但针对其广泛遗传结构及潜在起源区域的研究仍十分匮乏。本预研究旨在阐明该害虫的自然起源区域及其在亚洲的定殖扩散路径。本研究结合线粒体分子标记（mitochondrial markers）与微卫星分子标记（microsatellite markers），对采集自东南亚及中国各地的实蝇种群的遗传多样性、遗传结构及基因流水平进行了评估。两类分子标记均检测到与地理分布模式相符的复杂且显著的遗传结构，但两类标记下检测到的遗传结构均较为薄弱，且未发现距离隔离（isolation by distance）模式。该物种的多次长距离扩散事件及多样的寄主选择行为或可解释上述研究结果。上述复杂的遗传模式或受……影响。