Results of chi-squared tests of taxonomic heterogeneity among genetically and phenotypically highly divergent populations.

For these tests all taxa were treated as either non-Passeriformes or Passeriformes. Expected frequencies were obtained from the frequencies of non-Passeriformes and Passeriformes comparisons in the overall dataset (27% and 73%, respectively; see Table F in S1 File). Bins A-D correspond to Fig 1.