Species invasion is a global problem that threatens native species and ecosystems. While global invasion patterns are largely determined by area and exotic species pool. The levels of invasion vary greatly among different regions. The differences are mostly caused by the geopolitical history and how people define and count exotic species. Globally, there is no strong link between degree of invasion and humans. Within each country however, the level of invasion is strongly related to human population density. To minimize the impacts of invasion, further reducing species introductions, early detection, and eradication are still among the most effective ways. For further information or if you have any questions contact Qingfeng Guo.