In European temperate forests, plant species with a small distribution area are being replaced by widely distributed, sometimes geographically alien species. This leads to a decline in species richness at large geographic scales, which is often not visible locally.
Staude et al. 2020. Replacements of small- by large-ranged species scale up to diversity loss in Europe’s temperate forest biome. Nature Ecology & Evolution, DOI: 10.1038/s41559-020-1176-8 https://www.nature.com/articles/s41559-020-1176-8