Table 1.
Ranking of candidate GLM models evaluating predictors of Red-backed shrike response probability to playback calls during the breeding and migration periods. Variables include playback species, clutch initiation date, breeding stage, time of day, and bird age. Abbreviations: df = degrees of freedom; LL = log-likelihood; AICc = corrected Akaike information Criterion; ΔAICc = difference from top-ranked model; AICcwt = model weight
| Period | Model parameters | df | LL | AICc | Δ AICc | AICwt |
|---|---|---|---|---|---|---|
| Breeding period | Laying date + Species | 4 | −42.46 | 93.6 | 0.00 | 0.386 |
| Laying date + Species + Time | 5 | −42.22 | 95.5 | 1.89 | 0.151 | |
| Laying date + Species + Stage | 5 | −42.40 | 95.9 | 2.24 | 0.126 | |
| Species | 3 | −44.73 | 95.9 | 2.26 | 0.125 | |
| Migration | Species | 3 | −85.80 | 177.8 | 0.00 | 0.706 |
| Age + Species | 4 | −85.61 | 179.6 | 1.75 | 0.294 |