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

Table 4

Generalized dissimilarity modeling results. Shown are the percentages of the total variation observed and important predictor variables for “80–20” and “90–10” criteria for full models (using both geographic distance and environmental variables), models with environmental variables only, models with geographic distance only, and random models.

Model	% variance explained	Variables selected*
80–20 full	63.9	dist, Bio12, Bio10, elevation, Bio18
80–20 environment only	57.4	Bio16, elevation, Bio12, Bio10
80–20 distance only	39.9	dist
80–20 random env	0.6
90–10 full	58.9	dist, Bio18, Bio10, elevation, Bio12
90–10 environment only	53.4	elevation, Bio18, Bio10, Bio12
90–10 distance only	38.8	Dist
90–10 random env	0.4

*Variables are shown in order of decreasing importance (Figure 3); dist: geographic distance; for an explanation of the bioclimatic variables, see Table 3.