Biological and Environmental Sciences, University of Stirling, Stirling, Scotland, UK.
Biology Department, Queen's University, Kingston, ON, Canada.
Commun Biol. 2021 Mar 12;4(1):327. doi: 10.1038/s42003-021-01795-x.
Imperfect historical records and complex demographic histories present challenges for reconstructing the history of biological invasions. Here, we combine historical records, extensive worldwide and genome-wide sampling, and demographic analyses to investigate the global invasion of Mimulus guttatus from North America to Europe and the Southwest Pacific. By sampling 521 plants from 158 native and introduced populations genotyped at >44,000 loci, we determined that invasive M. guttatus was first likely introduced to the British Isles from the Aleutian Islands (Alaska), followed by admixture from multiple parts of the native range. We hypothesise that populations in the British Isles then served as a bridgehead for vanguard invasions worldwide. Our results emphasise the highly admixed nature of introduced M. guttatus and demonstrate the potential of introduced populations to serve as sources of secondary admixture, producing novel hybrids. Unravelling the history of biological invasions provides a starting point to understand how invasive populations adapt to novel environments.
不完整的历史记录和复杂的人口历史给重建生物入侵的历史带来了挑战。在这里，我们结合历史记录、广泛的全球和全基因组采样以及人口统计分析，研究了北美到欧洲和西南太平洋的双色金光菊的全球入侵。通过对来自 158 个本地和引入种群的 521 株植物进行采样，这些植物在 >44,000 个基因座上进行了基因型分析，我们确定，入侵的双色金光菊最初可能是从阿留申群岛（阿拉斯加）引入不列颠群岛的，随后是来自原生范围多个部分的混合。我们假设不列颠群岛的种群随后成为全球先锋入侵的桥头堡。我们的研究结果强调了引入的双色金光菊高度混合的性质，并证明了引入种群作为二次混合的来源的潜力，产生了新的杂种。揭示生物入侵的历史为了解入侵种群如何适应新环境提供了一个起点。
