Figure 1 in The introduction of three cryptic tree frog species in the Dutch coastal dunes challenges conservation paradigms

Figure 1. Map of the Netherlands showing sampled localities for Hyla tree frogs. A rough outline of the natural tree frog distribution range is shaded grey. Pies are sampled localities. Pie slices are coloured according to haplotype and pie sizes reflect sample sizes. Previously identified haplotypes are labelled 'old' and those newly identified in this study 'new'. The five populations introduced in the coastal dunes are labelled with the (approximate) date of appearance. Sampling details are in supplementary table S1.