Fig. 2.

Haplotype network showing relationships among geographic populations (taxa), based on statistical parsimony. Size of the ovals is proportional to haplotype frequency in each population. Each line between haplotypes indicates one mutational change, or step. Color boxes describe the nesting design of clades A and B. Only clades with significant geographic association are numbered (see Table 2). Thick black boxes delineate clades that have no genetic or geographic variation, and therefore cannot be included in the NCA (Santa Cruz populations showed insufficient variability for NCA). Minimum number of steps connecting boxed clades (data not shown) range between 13 and 31 (not supported by statistical parsimony).