Population genetics unveils large-scale migration dynamics and population turnover of Spodoptera exigua

文献类型： 外文期刊

第一作者： Wang, Xingya

作者： Wang, Xingya;Jiang, Shan;Yang, Xianming;Wyckhuys, Kris Ag;Wu, Kongming;Zhou, Lihong;Wyckhuys, Kris Ag;Wyckhuys, Kris Ag;Wyckhuys, Kris Ag;Nguyen Van Liem;Le Xuan Vi;Ali, Abid

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关键词： beet armyworm; genetic structure; integrated pest management (IPM); migration dynamics; spatial-temporal genetic diversity

期刊名称：PEST MANAGEMENT SCIENCE （ 影响因子：4.845； 五年影响因子：4.674 ）

ISSN： 1526-498X

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收录情况： SCI

摘要： BACKGROUND Migration is a widespread phenomenon among many insect species, including herbivorous crop pests. At present, scant information exists on the long-range migration of the polyphagous armyworm, Spodoptera exigua and its underlying climatic determinants (i.e. East Asian or South Asian monsoon circulation). In this study, we employed a population genetics approach to delineate S. exigua migration patterns across multiple Asian countries. RESULTS Using mitochondrial cytochrome I (COI) and microsatellite markers, low-to-moderate levels of genetic diversity were detected among 101 S. exigua populations collected across China, Pakistan and Vietnam. Haplotype diversity and nucleotide diversity did not differ between years. Two spatially explicit genetic clusters were detected, an eastern and a western clade, with the former comprising populations in the East Asia monsoon area. No genetic differentiation was recorded among armyworm populations in the year-round breeding area, nor among those of the overwintering and nonoverwintering areas. Five of the most widespread mitochondrial haplotypes reflected the extensive gene flow across at a large spatial scale. CONCLUSION Low-to-moderate levels of genetic diversity were observed, and evidence was found for genetic clustering in certain geographical areas. Accordingly, our unique insights into S. exigua population genetics and spatiotemporal migration dynamics help to guide applied ecological studies, ecological intensification schemes or (area-wide) pest management campaigns in China and abroad.

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