Fig. 1

Distribution and sampled localities of Anolis distichus subspecies in the Dominican Republic. Colored regions demark respective range distributions and dominant dewlap color of A. distichus subspecies (adapted from [16]). Filled black circles surrounded by boxes represent the study transects and associated sampling localities: T1 – T4 represent transects that transition between populations with different dewlap coloration; C1 – C4 represent control transects that span populations with similar dewlap coloration. To permit comparison to other figures, the first and last sample sites of each transect are numbered. Black triangles indicate additional sampled sites outside of our transects. Pie charts represent dewlap and genetic variation for each site in numerical order from left to right (see also Fig. 2 for more details). The top row of pie charts represent dewlap color variation with yellow, orange and peach proportions indicating the average proportion of yellow, and solid or diffuse orange visually observed in the dewlap, respectively. Females or juveniles found at the site are not included as they cannot be scored for dewlap color. The middle row of pie charts represents mitochondrial haplotype variation as determined from a maximum likelihood phylogenetic analysis, with different colors representing different mitochondrial clades (see also Fig. 3). Missing haplotype data is not included. The bottom row of pie charts represents nuclear genotypic variation as determined from STRUCTURE analyses, with different colors representing different genetic clusters (K) (K = 9 was the best estimate) (see also Fig. 2 for more details). Further substructure from subsequent STRUCTURE analyses on separate clusters is not shown