Boscolo Agostini Rajiv, Vizzari Maria Teresa, Benazzo Andrea, Ghirotto Silvia
Department of Life Sciences and Biotechnology, University of Ferrara, Via L.Borsari, 46 - 44121, Ferrara, Italy.
Heredity (Edinb). 2025 Jan;134(1):64-74. doi: 10.1038/s41437-024-00735-9. Epub 2024 Nov 18.
Halyomorpha halys is a polyphagous insect pest, which was first found outside its native regions in 1996, and since then it has rapidly spread worldwide causing damage to agriculture. Investigating the genetic diversity among H. halys populations is essential to understand the colonization history out of its native areas. Analyses based on mtDNA indicate multiple invasions from Asia to European and American continents, as well as serial invasions within invaded countries, but the colonization dynamics are still debated. Recently, genome-wide data (ddRAD) have been published to investigate the genomic structure of H. halys, proposing China as a putative source of multiple serial invasion events to Europe and the Americas. In this study we re-analyze published ddRAD sequences from worldwide populations of H. halys to better elucidate the colonization process. We assessed the genetic diversity in native populations identifying genetic differentiation between populations in China. Furthermore, we observed a complex pattern of population structure in the invaded countries, that may have originated from the occurrence of multiple independent colonization waves through time, from sub-populations present in the native range to Europe and the Americas. We tested alternative colonization hypotheses through Approximate Bayesian Computation comparison of demographic scenarios. Our results support multiple waves of migration from East China to invaded territories and the occurrence of European and American bridgehead effects. These results underline the importance of demographic inference through genome-wide data to investigate biological invasions, whose knowledge become fundamental to establish new strategies of management and control of invasive species.
褐飞蝽是一种多食性害虫，1996年首次在其原生区域以外被发现，自那时起它迅速在全球传播，对农业造成破坏。研究褐飞蝽种群间的遗传多样性对于了解其原生区域以外的定殖历史至关重要。基于线粒体DNA的分析表明，存在从亚洲到欧洲和美洲大陆的多次入侵，以及在入侵国家内部的连续入侵，但定殖动态仍存在争议。最近，已发表了全基因组数据（ddRAD）以研究褐飞蝽的基因组结构，提出中国是欧洲和美洲多次连续入侵事件的假定来源。在本研究中，我们重新分析了来自全球褐飞蝽种群的已发表ddRAD序列，以更好地阐明定殖过程。我们评估了原生种群的遗传多样性，确定了中国种群之间的遗传分化。此外，我们在入侵国家观察到了复杂的种群结构模式，这可能源于随着时间推移发生的多次独立定殖浪潮，即从原生范围内的亚种群到欧洲和美洲。我们通过近似贝叶斯计算比较人口统计情景来检验替代定殖假设。我们的结果支持了从中国东部到入侵地区的多次迁移浪潮以及欧洲和美洲桥头堡效应的存在。这些结果强调了通过全基因组数据进行人口统计推断以研究生物入侵的重要性，其知识对于制定入侵物种管理和控制的新策略至关重要。
