Fig. 2

Representation of the geographical and environmental space in the Olive Sparrow species complex. Maps show pairwise comparison and overlapping area (diagonal line patterns) between each group’s estimated distributions. A transparent colored polygon represents the accessible area (M) of each group. Plots along the diagonal (A, E, I) represent occurrence density in the environmental space for each group, with the color gradient indicating the suitability of environmental conditions. The shared area (M) is represented by a continuous line in each map (the dashed line represents 50% of the available environment)