Fig. 3.

Rates of speciation are uncorrelated with clade-specific variation in the rate at which species accumulate RI (Table 1; Table S3). (A) Premating ψ and relative speciation rate across nine Drosophila clades assuming low relative extinction rates (ψ model: asymptotic). (B) Postzygotic ψ for Drosophila (linear model) and relative speciation rates. (C) Postzygotic ψ estimates and mean speciation rate across 30 avian families (ψ model: asymptotic). (D) Postzygotic ψ estimates and the maximum speciation rate for bird clades.