Fig. 5: Geographic distribution of maternally and paternally-inherited COI haplotypes for Lampsilis siliquoidea (orange) and L. radiata (dark blue) in the putative hybrid zone (as described in Fig. 1).

Haplotypes of both species were found in some locations (orange-blue circles); hybrids are shown as LsLr. Division within a circle does not depict frequencies, but only the presence of both haplotypes. For ease of visualization rivers were not drawn in the figure, drainage information for each location and location codes are in Table 1.