Illinois Natural History Survey, University of Illinois at Urbana-Champaign, 1816 South Oak Street, Champaign, IL.
Department of Statistics, University of Illinois at Urbana-Champaign, 725 South Wright Street, Champaign, IL.
J Med Entomol. 2020 Sep 7;57(5):1488-1500. doi: 10.1093/jme/tjaa047.
The spread of the Asian tiger mosquito, Aedes albopictus Skuse, throughout the United States has implications for the transmission potential of vector-borne diseases. We used a 30-yr data set of occurrence records in Illinois and developed a hierarchical Bayesian model to shed light on the patterns and processes involved in the introduction and expansion along the northern edge of the geographic range of this species. We also collected specimens from 10 locations and sequenced a segment of their mitochondrial COI genes to assess possible introduction sources and geographic patterns in genetic variation present within contemporary populations. We documented an increase in the number of observations throughout the southern and central parts of Illinois over the study period. The process through which this spread occurred is likely only partially due to local dispersal. The probability of successfully overwintering was likewise low, but both these parameters increased over the study period. This suggests that the presence of Ae. albopictus has been largely due to repeated introductions, but that in recent years populations may have become established and are leading to an increase in locally driven dispersal. There was considerable genetic diversity among populations in Illinois, with 13 distinct haplotypes present in 10 sampling locations, several of which matched haplotypes previously found to be present in locations such as Texas or Japan. Further research is needed to understand how the combination of continued propagule pressure and establishment of populations are driving the increase and expansion of this invasive mosquito along its northern distribution limit.
亚洲虎蚊（Aedes albopictus Skuse）在美国的传播，对媒介传播疾病的传播潜力产生了影响。我们使用了伊利诺伊州 30 年的发生记录数据集，并开发了一个层次贝叶斯模型，以揭示该物种地理分布北缘引入和扩展过程中的模式和过程。我们还从 10 个地点收集了标本，并对其线粒体 COI 基因的一个片段进行了测序，以评估当代种群中存在的可能引入来源和遗传变异的地理模式。我们记录了在研究期间伊利诺伊州南部和中部观察到的数量增加。这种传播发生的过程可能部分是由于局部扩散。成功越冬的概率也很低，但这两个参数在研究期间都有所增加。这表明，Ae. albopictus 的存在主要是由于反复引入，但近年来，种群可能已经建立，并导致本地驱动的扩散增加。伊利诺伊州的种群之间存在相当大的遗传多样性，在 10 个采样地点存在 13 种不同的单倍型，其中一些与之前在德克萨斯州或日本等地发现的单倍型相匹配。需要进一步研究，以了解不断增加的繁殖体压力和种群的建立如何推动这种入侵性蚊子在其北部分布极限的增加和扩展。
