Diatraea saccharalis history of colonization in the Americas. The case for human-mediated dispersal

The sugarcane borer moth, Diatraea saccharalis, is one of the most important pests of sugarcane and maize crops in the Western Hemisphere. The pest is widespread throughout South and Central America, the Caribbean region and the southern United States. One of the most intriguing features of D. saccharalis population dynamics is the high rate of range expansion reported in recent years. To shed light on the history of colonization of D. saccharalis, we investigated the genetic structure and diversity in American populations using single nucleotide polymorphism (SNPs) markers throughout the genome and sequences of the mitochondrial gene cytochrome oxidase (COI). Our primary goal was to propose possible dispersal routes from the putative center of origin that can explain the spatial pattern of genetic diversity. Our findings showed a clear correspondence between genetic structure and the geographical distributions of this pest insect on the American continents. The clustering analyses indi...

甘蔗螟蛾（Diatraea saccharalis）是西半球甘蔗与玉米作物最具危害性的害虫之一。该害虫广泛分布于南美洲、中美洲、加勒比地区以及美国南部地区。其种群动态中最引人关注的特征之一，便是近年来被报道的快速分布范围扩张现象。为阐明甘蔗螟蛾的定殖历史，本研究利用全基因组范围内的单核苷酸多态性（single nucleotide polymorphism, SNPs）标记以及线粒体细胞色素氧化酶（COI）基因序列，对美洲地区的种群开展了遗传结构与遗传多样性分析。本研究的核心目标为，基于该害虫的遗传多样性空间分布模式，推测其源自推测的起源中心的潜在扩散路径。研究结果显示，该害虫在美洲大陆的遗传结构与其地理分布存在清晰的对应关系。聚类分析结果显示……