Figure 2. Additional Evidence for Gene Flow among Sympatric Species in Costa Rica.
(A–D) Sympatric H. melpomene and H. cydno show reduced divergence, measured by both FST and dXY, relative to allopatric comparisons, across two different regions of the genome. Error bars (indicating 95% confidence intervals) and p values are based on bootstrap resampling.
(E and F) Furthermore, Patterson’s D statistic is highly elevated in these regions, indicative of biased allele sharing in sympatry due to introgression. Error bars (indicating 95% confidence intervals) and p values are based on bootstrap resampling. *p < 0.05, **p < 0.01, ***p < 0.001.