Data from: Host range expansion of native insects to exotic trees increases with area of introduction and presence of congeneric native trees

1. Exotic tree species are widely used in forest plantations for their often high productivity and performance compared to native trees. However, these advantages may be compromised by herbivore damage. 2. A list of European insect species that have expanded their host range to one of 28 exotic tree species introduced to Europe was compiled from a systematic literature review. The number of successful expansions was analysed using three predictors: (1) phylogenetic relatedness between exotic and European tree species; (2) area covered by exotic tree species in Europe; and (3) time since their introduction into Europe. 3. In total, 590 host expansions of native insects to exotic trees were found, mainly of polyphagous species (43%); 25% of the cases reported some type of damage. Bark and wood borers, and defoliators were the dominant guilds. 4. The number of recruited native insect species and cases where major damage occurred were positively correlated with the geographical extent of exotic trees in Europe and the presence of congeneric native trees. 5. Synthesis and applications. The use of exotic tree species creates opportunities for native insect herbivores to expand their host range and increase their damage if they are widely planted next to native congeners. Risk assessment studies are recommended when introducing new tree species for forestry plantations. Risk assessments should include trials on susceptibility to any potential damaging organisms in the introduced range.1. 外来树种（exotic tree species）因相较于本土树种（native trees）通常具有更高的生产力与综合表现，故而被广泛应用于人工林营建。然而，此类优势可能因植食性动物为害而受到削弱。 2. 本研究通过系统文献综述，整理出一份欧洲昆虫物种名录：这些昆虫已将寄主范围（host range）拓展至28种引入欧洲的外来树种之一。研究采用三项预测因子对成功拓展寄主范围的昆虫数量进行分析：（1）外来树种与欧洲本土树种的系统发育亲缘关系（phylogenetic relatedness）；（2）外来树种在欧洲的分布面积；（3）外来树种引入欧洲至今的时长。 3. 总计发现本土昆虫向外来树种拓展寄主范围的事件共590起，其中广食性物种（polyphagous species）占比43%，为主要类群；25%的事件报告存在不同类型的为害情况。蛀干类昆虫（包括树皮蛀食者与木材蛀食者）及食叶类昆虫为优势功能群（guild）。 4. 被成功拓展寄主范围的本土昆虫物种数量，以及发生重大为害的事件数，均与外来树种在欧洲的地理分布范围以及同属本土树种（congeneric native trees）的存在呈正相关。 5. 研究结论与实践启示。若外来树种与同属本土树种邻近且大面积种植，其应用将为本土植食性昆虫提供拓展寄主范围、加剧为害的机会。在引入新树种用于人工林营建时，建议开展风险评估研究。此类风险评估应包含对引入范围内潜在有害生物的敏感性试验。