Fig. 9

Linear regressions between nucleotide diversity (π) of the Balkan slow-worm evolutionary lineages/haplogroups and modus above the third quartile of the terrain ruggedness index of particular topographic units (mountain systems). In the first analysis (a) the Apuseni Mts. were treated as a separate unit, while in the second analysis (b) the Apuseni Mts. were considered to be a part of the Carpathians. b - regression coefficient, P - probability value. Legends: 1 – Apuseni Mts., 2 – Stara Planina Mts., 3 – Macedonian-Thracian Massif, 4 – Dinarides, 5 – Carpathians, 6 – Prealps, 7 – Peloponnese, 8 – Hellenides (without Peloponnese)