Table 3. Models fitted to different reproductive parameters.
| Reproductive parameter | Model ID | Fixed effects | Random effects | K | ΔAICci | wAICci |
| Chicks fledged nesting attempt−1 | 1 | yr | Female ID | 4 | 0.000 | 0.285 |
| 2 | none | Female ID | 2 | 0.309 | 0.244 | |
| Chicks fledged male−1 season−1 | 3 | trt × HD, yr | Male ID | 8 | 0.000 | 0.594 |
| Chicks fledged female−1 season−1 | 4 | none | Female ID | 2 | 0.000 | 0.326 |
| 5 | trt | Female ID | 3 | 1.003 | 0.197 | |
| 6 | yr | Female ID | 4 | 1.999 | 0.120 | |
| Clutch size | 7 | none | - | 1 | 0.000 | 0.462 |
| 8 | yr | - | 2 | 1.631 | 0.204 | |
| Log egg volume | 9 | none | Female ID | 3 | 0.000 | 0.379 |
| 10 | HD | Female ID | 4 | 0.336 | 0.321 | |
| Hatching date | 11 | trt, yr | Male ID | 6 | 0.000 | 0.358 |
| 12 | trt, yr, maleage | Male ID | 7 | 0.761 | 0.244 | |
| Hatching success | 13 | HD | Female ID | 3 | 0.000 | 0.335 |
| 14 | none | Female ID | 2 | 1.079 | 0.195 | |
| Chick maximum wing chord | 15 | trt × yr, chickage | Female ID | 7 | 0.000 | 0.288 |
| Nest survival | 16 | none | - | 2 | 0.000 | 0.327 |
| 17 | trt | - | 2 | 1.323 | 0.169 | |
| 18 | found | - | 2 | 1.889 | 0.127 | |
| Breeding attempts male−1 season−1 | 19 | trt, HD | - | 3 | 0.000 | 0.392 |
| 20 | trt × HD | - | 4 | 0.920 | 0.247 |
AICc is the corrected Akaike's Information Criterion, ΔAICci is the difference in AICc between model i and the best model and wAICci is the Akaike weight. Plausible models (ΔAICci ≤2) are presented; see Tables S2–S14 for the full sets of candidate models. Interactions are indicated by × and include all lower order additive terms as well.
Fixed effects (in order of appearance in table). yr = year, none = intercept-only model, trt = treatment (fed or control), HD = standardized hatching date, maleage = male age (young (yearling) or old (2+)), chickage = age of chicks, found = standardized date nest found.