Fig. 3From: Evidence for multiple introductions of an invasive wild bee species currently under rapid range expansion in EuropePrincipal coordinates analyses from the four sample groups. For the above panel individuals are colored according to the sample groups: Switzerland (CH), France (FR), South France (SFR) and Vienna (VIE). The panel below based on cluster assignment probability calculations in Structure for K = 4. A sample was assigned to a certain cluster if the Q score was above 50%, otherwise was considered to be admixedBack to article page