AIM: Plant species continue to be moved outside of their native range by human activities. Here, we aim to determine whether, once introduced, plants assimilate into native communities or whether they aggregate, thus forming mosaics of native‐ and alien‐rich communities. Alien species might aggregate in their non‐native range owing to shared habitat preferences, such as their tendency to establish in high‐biomass, species‐poor areas. LOCATION: Twenty‐two herbaceous grasslands in 14 countries, mainly in the temperate zone. TIME PERIOD: 2012–2016. MAJOR TAXA STUDIED: Plants. METHODS: We used a globally coordinated survey. Within this survey, we found 46 plant species, predominantly from Eurasia, for which we had co‐occurrence data in their native and non‐native ranges. We tested for differences in co‐occurrence patterns of 46 species between their native (home) and non‐native (away) range. We also tested whether species had similar habitat preferences, by testing for differences in total biomass and species richness of the patches that species occupy in their native and non‐native ranges. RESULTS: We found the same species to show different patterns of association depending on whether they were in their native or non‐native range. Alien species were negatively associated with native species; instead, they aggregated with other alien species in species‐poor, high‐biomass communities in their non‐native range compared with their native range. MAIN CONCLUSIONS: The strong differences between the native (home) and non‐native (away) range in species co‐occurrence patterns are evidence that the way in which species associate with resident communities in their non‐native range is not species dependent, but is instead a property of being away from their native range. These results thus highlight that species might undergo important ecological changes when introduced away from their native range. Overall, we show origin‐dependent associations that result in novel communities, in which alien‐rich patches exist within a mosaic of native‐dominated communities.

中文翻译：

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不是大熔炉：植物物种聚集在它们的非本地范围内

目标：人类活动继续将植物物种移出其原生范围。在这里，我们的目标是确定植物一旦被引入，是否会同化到本地社区或它们是否聚集，从而形成本地和外来丰富社区的马赛克。由于共同的栖息地偏好，外来物种可能会聚集在它们的非本土范围内，例如它们倾向于在高生物量、物种贫乏的地区建立。位置：14 个国家的 22 个草本草原，主要位于温带。时间段：2012-2016。研究的主要分类群：植物。方法：我们使用了一项全球协调的调查。在这次调查中，我们发现了 46 种植物物种，主要来自欧亚大陆，我们有它们在原生和非原生范围内的共现数据。我们测试了 46 种物种在其原生（家乡）和非原生（远离）范围之间的共现模式差异。我们还通过测试物种在其原生和非原生范围内占据的斑块的总生物量和物种丰富度的差异，测试了物种是否具有相似的栖息地偏好。结果：我们发现同一物种显示出不同的关联模式，这取决于它们是在本地还是非本地范围内。外来物种与本地物种呈负相关；相反，它们与其他外来物种聚集在其非本地范围内物种贫乏、生物量高的群落中，与它们的本地范围相比。主要结论：本地（家乡）和非本地（离开）范围在物种共现模式方面的巨大差异证明，物种与其非本地范围内的居民社区关联的方式不是物种依赖性的，而是一种远离他们的原生范围的属性。因此，这些结果强调了物种在离开其原生范围时可能会发生重要的生态变化。总体而言，我们展示了导致新社区的起源依赖关联，其中在以土著为主的社区的马赛克中存在着丰富的外星人补丁。因此，这些结果强调了物种在离开其原生范围时可能会发生重要的生态变化。总体而言，我们展示了导致新社区的起源依赖关联，其中在以土著为主的社区的马赛克中存在着丰富的外星人补丁。因此，这些结果强调了物种在离开其原生范围时可能会发生重要的生态变化。总体而言，我们展示了导致新社区的起源依赖关联，在这些社区中，外星丰富的斑块存在于以土著为主的社区的马赛克中。