Abstract Aim Alien plant species can cause severe ecological and economic problems, and therefore attract a lot of research interest in biogeography and related fields. To identify potential future invasive species, we need to better understand the mechanisms underlying the abundances of invasive tree species in their new ranges, and whether these mechanisms differ between their native and alien ranges. Here, we test two hypotheses: that greater relative abundance is promoted by (a) functional difference from locally co‐occurring trees, and (b) higher values than locally co‐occurring trees for traits linked to competitive ability. Location Global. Time period Recent. Major taxa studied Trees. Methods We combined three global plant databases: sPlot vegetation‐plot database, TRY plant trait database and Global Naturalized Alien Flora (GloNAF) database. We used a hierarchical Bayesian linear regression model to assess the factors associated with variation in local abundance, and how these relationships vary between native and alien ranges and depend on species’ traits. Results In both ranges, species reach highest abundance if they are functionally similar to co‐occurring species, yet are taller and have higher seed mass and wood density than co‐occurring species. Main conclusions Our results suggest that light limitation leads to strong environmental and biotic filtering, and that it is advantageous to be taller and have denser wood. The striking similarities in abundance between native and alien ranges imply that information from tree species’ native ranges can be used to predict in which habitats introduced species may become dominant.

中文翻译：

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本土和外来森林中树木丰度的相似因素


摘要 目的 外来植物物种会造成严重的生态和经济问题，因此引起了生物地理学及相关领域的广泛研究兴趣。为了识别未来潜在的入侵物种，我们需要更好地了解入侵树种在其新范围内丰富的机制，以及这些机制在其本地和外来范围之间是否有所不同。在这里，我们测试了两个假设：（a）与本地共生树木的功能差异，以及（b）与竞争能力相关的性状比本地共生树木更高的值，促进了更大的相对丰度。地点 全球。时间段 最近。主要分类单元研究树木。方法 我们结合了三个全球植物数据库：sPlot 植被样地数据库、TRY 植物性状数据库和全球自然化外来植物区系 (GloNAF) 数据库。我们使用分层贝叶斯线性回归模型来评估与当地丰度变化相关的因素，以及这些关系如何在本地和外来范围之间变化以及取决于物种的特征。结果在这两个范围内，如果物种在功能上与共生物种相似，但比共生物种更高、种子质量和木材密度更高，则它们的丰度最高。主要结论我们的结果表明，光照限制会导致强烈的环境和生物过滤，并且更高和更密的木材是有利的。本地和外来范围之间的丰度惊人相似，这意味着来自树种本地范围的信息可用于预测引入物种可能在哪些栖息地中占据主导地位。