State Key Laboratory of Ecological Pest Control for Fujian and Taiwan Crops, Institute of Applied Ecology, Fujian Agriculture and Forestry University, Fuzhou, 350002, China.
Joint International Research Laboratory of Ecological Pest Control, Ministry of Education, Fuzhou, 350002, China.
Sci Rep. 2019 Jul 16;9(1):10314. doi: 10.1038/s41598-019-46742-3.
Invasive species may change the life history strategies, distribution, genetic configuration and trophic interactions of native species. The diamondback moth, Plutella xylostella L., is an invasive herbivore attacking cultivated and wild brassica plants worldwide. Here we present phylogeographic analyses of P. xylostella and one of its major parasitoids, Cotesia vestalis, using mitochondrial markers, revealing the genetic diversity and evolutionary history of these two species. We find evidence that C. vestalis originated in Southwest China, then adapted to P. xylostella as a new host by ecological sorting as P. xylostella expanded its geographic range into this region. Associated with the expansion of P. xylostella, Wolbachia symbionts were introduced into local populations of the parasitoid through horizontal transfer from its newly associated host. Insights into the evolutionary history and phylogeographic system of the herbivore and its parasitoid provide an important basis for better understanding the impacts of biological invasion on genetic configuration of local species.
入侵物种可能会改变本地物种的生活史策略、分布、遗传结构和营养相互作用。小菜蛾（Plutella xylostella L.）是一种入侵性的食草动物，会攻击世界各地的栽培和野生十字花科植物。在这里，我们使用线粒体标记物对小菜蛾及其主要寄生蜂之一 Cotesia vestalis 进行了系统地理学分析，揭示了这两个物种的遗传多样性和进化历史。我们发现有证据表明，C. vestalis 起源于中国西南部，然后随着小菜蛾的地理分布范围扩展到该地区，通过生态选择适应了小菜蛾作为新宿主。小菜蛾的扩张伴随着其共生菌沃尔巴克氏体通过水平转移从其新的相关宿主中引入到寄生蜂的当地种群中。对食草动物及其寄生蜂的进化历史和系统地理学的了解，为更好地理解生物入侵对本地物种遗传结构的影响提供了重要基础。
