Figure 1 in An isolated crested newt population in Dutch coastal dunes: distribution relict or introduction?

Figure 1. Sampled localities for the northern crested newt Triturus cristatus. The inset shows localities in the Netherlands, coloured based on ND4 mtDNA haplotype. Arrows highlight populations discussed in the text: 1) Meijendel and Westduinpark; 2) Krimpen aan den IJssel and Oudeland; 3) Norg; and 4) Breda. A rough outline of the natural distribution range in the Netherlands is shaded grey. See supplementary table S1 for details. The main map shows haplotype distribution in the rest of Europe and particularly focusses on those haplotypes also present in the Netherlands (see text for details).