Fig. 2.

Avian- and owl-specific CNEEs with evidence of accelerated rates of evolution in diurnal owls. The phylogenetic tree illustrates the shift in substitution rates under the full model [according to Hu et al. (2019) and Sackton et al. (2019)]. Diurnal species are indicated in red. The branch lengths are proportional to the posterior mean substitution rate. The line below each tree shows the name of the CNEE and its associated gene, the values of the two log-BFs, and the conserved (r₁) and accelerated substitution rate (r₂). The sequence data support a parallel shift from a conserved CNEE indicating purifying selection (blue) to an accelerated substitution rate (red) in two or three diurnal owl species.