The number of alien taxa per region as presented in the final sTWIST database. Smaller island regions are depicted by circles, with the size of the circles proportional to the numbers of taxa. Region delineations are based on Global Administrative Areas (GADM).

  Part of: Seebens H, Clarke DA, Groom Q, Wilson JRU, García-Berthou E, Kühn I, Roigé M, Pagad S, Essl F, Vicente J, Winter M, McGeoch M (2020) A workflow for standardising and integrating alien species distribution data. NeoBiota 59: 39-59.