Figure 4

Introgression pattern in populations of the Ardèche. a) Distribution of individuals in the Ardèche hybrid zone correlating the percentage of ancestral genome (q score of Structure) defined with microsatellite data and mitochondrial DNA (with P. toxostoma in red, C. nasus in green, and hybrids in blue, see text). b) and c) Distribution of the 41 loci according to the percentage of homozygous and interspecific heterozygous specimens given by Introgress (P. toxostoma in red, C. nasus in green, and hybrids in blue) in Ardèche populations (b) and in Ardèche populations without F1 individuals (c). As an example, in the Rosières population, at more than thirty loci 10% of the specimens are C. nasus homozygous.