Analysis of isolation by distance in continuous and fragmented populations of I. monticola.

Abbreviations: CAMOR–a priori continuous populations from the Cantabrian Mountain Range (L7, L8, L9, L13, L15); OCCIDENTAL–fragmented populations from elsewhere (L1, L2, L3, L4, L5, L6, L10, L11); FST – Weir’s FST genetic distance; DC–chord genetic distance; d – geographic distance between localities, in km; Π–average number of mitochondrial nucleotide differences between populations; r–estimated correlation coefficient; P-value–result of randomization test of significance; b – estimated regression coefficient.