(a) Median-joining network for mitochondrial DNA haplotypes found in Eurasian reindeer. Haplotypes found only in wild herds are represented by squares, whereas the triangles represent domestic haplotypes. Circles represent haplotypes found in both wild and domestic herds. Blue haplotypes are found in Fennoscandia, whereas the orange and green haplotypes represent western and eastern Russia, respectively. Five different haplotype clusters (haplogroups, I–V) are encircled with different colours. Haplotypes that are directly mentioned in the text are labelled with capital letters. (b) Haplogroup frequencies in wild (squares) and domestic (triangles) reindeer herds. Populations are pooled according to geography and whether they are wild or domestic herds: (1) southwestern Norway wild (Nor-Wild 6–8), (2) central Norway wild (Nor-Wild 1–5), (3) central Norway domestic (Nor-Dom 1–3), (4) northern Norway domestic (Nor-Dom 4–6), (5) northern Finland domestic (Fin-Dom 2), (6) eastern Finland domestic (Fin-Dom 1), (7) eastern Finland wild (Fin-Wild 1), (8) northwestern Russia domestic (Rus-Dom 6 and 7), (9) north–central Russia domestic (Rus-Dom 3–5), (10) southeastern Russia domestic (Rus-Dom 2), (11) southeastern Russia wild (Rus-Wild 2), (12) northeastern Russia wild (Rus-Wild 1), (13) northeastern Russia domestic (Rus-Dom 1; see table S1 in the electronic supplementary material). Colours representing the different haplogroups are the same that are used to mark them in (a). Green lines in the map indicate the distribution range of Eurasian reindeer.