Université Grenoble Alpes, CNRS UMR 5553 LECA, Grenoble, France.
Université Grenoble Alpes, CNRS UMR 5525 TIMC-IMAG, Grenoble, France.
Mol Ecol. 2019 May;28(9):2360-2377. doi: 10.1111/mec.15071. Epub 2019 Apr 29.
Multiple introductions are key features for the establishment and persistence of introduced species. However, little is known about the contribution of genetic admixture to the invasive potential of populations. To address this issue, we studied the recent invasion of the Asian tiger mosquito (Aedes albopictus) in Europe. Combining genome-wide single nucleotide polymorphisms and historical knowledge using an approximate Bayesian computation framework, we reconstruct the colonization routes and establish the demographic dynamics of invasion. The colonization of Europe involved at least three independent introductions in Albania, North Italy and Central Italy that subsequently acted as dispersal centres throughout Europe. We show that the topology of human transportation networks shaped demographic histories with North Italy and Central Italy being the main dispersal centres in Europe. Introduction modalities conditioned the levels of genetic diversity in invading populations, and genetically diverse and admixed populations promoted more secondary introductions and have spread farther than single-source invasions. This genomic study provides further crucial insights into a general understanding of the role of genetic diversity promoted by modern trade in driving biological invasions.
多种引入途径是引入物种建立和持续存在的关键特征。然而，对于遗传混合对种群入侵潜力的贡献知之甚少。为了解决这个问题，我们研究了亚洲虎蚊（Aedes albopictus）在欧洲的近期入侵。我们使用近似贝叶斯计算框架结合全基因组单核苷酸多态性和历史知识，重建了种群的扩散途径，并确定了入侵的种群动态。欧洲的种群扩散至少涉及在阿尔巴尼亚、意大利北部和意大利中部的三个独立引入事件，这些引入事件随后成为了整个欧洲的扩散中心。我们表明，人类交通网络的拓扑结构塑造了种群的历史动态，意大利北部和意大利中部是欧洲的主要扩散中心。引入途径决定了入侵种群的遗传多样性水平，遗传多样性高且混合的种群更容易引发更多的二次引入，传播范围也更广。这项基因组研究为深入理解现代贸易促进的遗传多样性在推动生物入侵方面的作用提供了进一步的关键见解。
