Bioregions that receive and potentially donate alien crab species. Where donating regions were not confirmed in the literature, they were determined using (a) the native range of the alien crabs and (b) using the most likely shipping routes (Seebens et al. 2013). Bioregions are represented by the different coloured segments. Lines that are the same colour as the segments represent species donated from that bioregion. Lines radiate to the bioregions to which species were donated. The numbers around the diagram represent the numbers of species (both native and alien) in each bioregion.