Table 2 Significant predictors of male quality in satin bowerbirds.
| Dependent variables |
Significant predictors |
ß' |
F |
p |
df |
|
| I. Ectoparasites |
Bower quality score (R2 =.51) |
-0.72 |
8.4 |
.02 |
1,8 |
| II. Endoparasites |
Rump UVV-brightness (R2 =.50) |
-0.70 |
8.9 |
.02 |
1,8 |
| III. Feather growth rate |
Whole model (R2 =.74) |
|
6.7 |
.02 |
3,9 |
|
PC1 plumage color score |
-1.39 |
17.8 |
.004 |
1,9 |
|
Wing coverts UVV-brightness |
0.66 |
5.9 |
.04 |
1,9 |
|
Rump UVV-brightness |
0.63 |
5.0 |
.05 |
1,9 |
| IV. Body size |
Whole model (R2 =.82) |
|
8.9 |
.01 |
3,8 |
|
Rump UVV-brightness |
0.83 |
16.7 |
.006 |
1,8 |
|
Bower quality score |
-0.89 |
10.4 |
.02 |
1,8 |
|
Number of decorations |
0.77 |
8.9 |
.02 |
1,8 |
|
Each model was constructed using backward stepwise multiple regression analysis with both bower features (bower quality score, number of decorations) and plumage features (PC1 plumage color score, UVV-brightness of the wing coverts, mantle, rump, and breast) as independent variables. Standardized regression coefficients (ß') and significance tests are shown for each significant predictor variable.