English: Both ecological selection pressures and selection to avoid intrinsic incompatibilities mould hybrid genomes. Depending on the balance between beneficial alleles and incompatibilities hybridisation can result either in an admixed taxon that is reproductively isolated from both parent taxa, or local introgression into a taxa that remains distinct in spite of occasional gene flow. RI abbreviates reproductive isolation. Fd is estimated between a hybrid population and the red parent species, and the haplotypes illustrate example individuals in these populations