TOTAL REPRODUCTIVE ISOLATION

The combined action of behavioral isolation plus. sexual selection against hybrids results in strong reproductive isolation between Golden-winged and Blue-winged Warblers at all study sites, ranging from 0.920 to 1 (mean: 0.966; lower 95% CI: 0.942; upper 95% CI: 0.988). The absolute contribution of behavioral isolation to total reproductive isolation was much greater than that of sexual selection against hybrids (two-tailed, paired t -test: df = 7, t = -48.58, p< 0.0001). See Fig. 2.