Fig. 2. Proportions of females choosing unimodal high-frequency calls over unimodal low-frequency calls at 85 dB SPL. NW, northwestern mtDNA lineage; SW, southwestern mtDNA lineage; E, eastern mtDNA lineage as defined by Ptacek et al. (Ptacek et al., 1994); NC, North Carolina; MO, Missouri. ^*The P-value of a two-tailed binomial test was 0.0495, even though the upper 95% credible limit was 52.2%, almost the same as that for the non-significant (P>0.05) result for tests of females from MO.