Additional file 2.

Figure *.tif. Bioclimatic niche models. The suitable bioclimatic conditions of the native monophyletic North + Central American (A; red) and European (B; yellow) clades are illustrated. Niche projections for these clades and between the areas are depicted in C and D. Black triangles indicated occurrence data of native (in A and B) and schematic snails of introduced taxa (in C). A: Potential distribution of the native North + Central American clade. B: Potential distribution of the native European clade. C: Projected distribution of the European clade in North + Central America. Non-native European Carychium minimum (CM) and C. tridentatum (CT) populations are indicated. D: Projected distribution of the North + Central American clade in Europe.

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Weigand et al. BMC Evolutionary Biology 2013 13:18   doi:10.1186/1471-2148-13-18