Table 1.
Sex‐biased dispersal (response variable) in birds in relation to the intensity of sexual selection and to the social environment using phylogenetic least‐squares models. Table shows parameter estimates calculated using 100 phylogenies (see Methods for further explanation). N refers to the number of species
| Predictors | Natal dispersal bias | Breeding dispersal bias | ||
|---|---|---|---|---|
| b ± SE | p ± SE N | b ± SE | p ± SE N | |
| Sexual selection | ||||
| Social mating system | 0.026 ± 0.074 | .476 ± 0.005, 58 | −0.013 ± 0.114 | .764 ± 0.013, 28 |
| Testis size | −0.076 ± 0.191 | .694 ± 0.0001, 36 | −0.297 ± 0.791 | .0948 ± 0.0001, 29 |
| Extra‐pair broods | −0.443 ± 0.477 | .361 ± 0.004, 36 | 0.387 ± 0.397 | .5502 ± 0.01, 27 |
| Parental care | 0.041 ± 0.111 | .798 ± 0.0001, 56 | −0.151 ± 0.169 | .256 ± 0.0001, 30 |
| Sexual size dimorphism | 0.401 ± 1.001 | .693 ± 0.0001, 55 | 0.234 ± 1.009 | .551 ± 0.0001, 38 |
| Sexual dichromatism | 0.033 ± 0.087 | .710 ± 0.0001, 25 | 0.045 ± 0.0932 | .599 ± 0.0001, 22 |
| Social environment | ||||
| Adult sex ratio | −31.740 ± 25.234 | .223 ± 0.0001, 24 | −68.376 ± 28.713 | .0411 ± 0.0001, 14 |
| Mortality bias | Not tested | Not tested | 2.067 ± 0.031 | .0593 ± 0.002, N = 25 |