Table 2 Effect of phenotypic traits and local breeding contexts on the probability of polygyny (0/1) for a given male-female combination. Phenotypic traits in males and females are compared in relation to their neighbours to investigate mating patterns at the neighbourhood level. The effect of age was estimated by creating two orthogonal vectors for the first and second polynomial from the original variable (with function "poly" in the R software), and thus the resulting estimates cannot be immediately interpreted biologically (see main text for details)
Random effects | Variance | Std. Dev |
|---|---|---|
Female ID | < 0.001 | < 0.001 |
Male ID | < 0.001 | < 0.001 |
Fixed effects: | Estimate | Std. error | z | P |
|---|---|---|---|---|
Intercept | − 3.22 | 0.26 | − 12.15 | < 0.001 |
Distance | − 0.05 | 0.01 | − 8.50 | < 0.001 |
Female's breeding date | 0.05 | 0.01 | 3.91 | < 0.001 |
Female's number of neighbours | 0.01 | 0.04 | 0.41 | 0.69 |
Female's tarsus length | 0.13 | 0.19 | 0.72 | 0.47 |
Female's age | − 0.01 | 0.18 | − 0.04 | 0.97 |
Female's age (quadratic) | − 0.15 | 0.18 | − 0.84 | 0.40 |
Female's wing length | − 0.07 | 0.07 | − 1.03 | 0.30 |
Male's breeding date | − 0.09 | 0.02 | − 4.23 | < 0.001 |
Male's number of neighbours | − 0.03 | 0.04 | − 0.85 | 0.40 |
Male's tarsus length | 0.15 | 0.19 | 0.76 | 0.45 |
Male's age | 0.03 | 0.16 | 0.20 | 0.85 |
Male's age (quadratic) | − 0.28 | 0.19 | − 1.50 | 0.14 |
Male's forehead patch size | 0.00 | 0.01 | 0.00 | 1.00 |
Male's black plumage (dorsal) | − 0.01 | 0.00 | 1.13 | 0.26 |
Male's wing size | 0.08 | 0.07 | 1.16 | 0.25 |