The Role of Environmental Heterogeneity in Maintaining Reproductive Isolation between Hybridizing Passerina (Aves: Cardinalidae) Buntings

Figure 2

Generalized dissimilarity modeling results of the proportion of pure P. amoena individuals, plus one half of the hybrid individuals, in a population. Left two panels: “80–20” criterion; right two panels: “90–10” criterion. Top two panels: full model (including both geographic distance and environmental variables); bottom two panels: models for only environmental variables. Colors indicate the proportion of pure P. amoena individuals, plus one half of the hybrid individuals, in the population (brown/tan 100%, blue = 0%).