Criteria (adopted from Bolnick and Fitzpatrick (2007)) | Strategy |
1) Sister Species | Phylogenetic analysis |
2) Complete reproductive isolation | Ratio of reproductive events leading to hybrid offspring |
3) Overlapping geographic ranges | Calculating average geographic distance between all individuals of sister species |
4) Allopatric/Parapatric alternative hypotheses | Rejecting alternative hypotheses using the combination of phylogenetic tracking and biogeographic data |