Figure 1

Unrooted network illustrating the phylogenetic relationships of the mtDNA haplotypes. Haplotype names correspond to the ones in Additional file 1 and colours to regions as indicated in Table 1. Circle sizes scale to indicate the number of individuals harbouring each haplotype. Small black dots indicate unsampled intermediate haplotypes. Note that distances between circles are not proportional to the genetic distance but are arranged for better visibility.