Table 2.
Relative rating task: (A) Values of the GLMMs computed across and within silver fox strains. We assessed acoustic predictors of humans’ ability to identify vocalizations expressing higher levels of arousal across and within silver fox strains. Bold type indicate P ≤0.05; degrees of freedom = 1 for all fixed factors. (B) Outcome of model selection procedure based on AICc. Degrees of freedom = 6 for all models. Bold type indicates models with the strongest support based on log likelihood (logLik), akaike weights and the difference between the AICc values of two models (ΔAICc ≤2.0)
| (A) Generalized linear mixed models | (B) Model selection procedure | ||||||
|---|---|---|---|---|---|---|---|
| Across strains | |||||||
| Fixed effect | χ2 | P(χ2) | Model | logLik | AICc | ΔAICc | Akaike weight |
| duration | 4.279 | 0.039 | exluding duration | -422.123 | 856.362 | 0.000 | 0.592 |
| DF | 6.258 | 0.012 | exluding DF | -423.113 | 858.342 | 1.979 | 0.220 |
| F0 | 6.570 | 0.010 | exluding F0 | -423.269 | 858.654 | 2.291 | 0.188 |
| HNR | 21.582 | <.001 | exluding HNR | -430.775 | 873.666 | 17.303 | 0.000 |
| SCOG | 21.936 | <.001 | exluding SCOG | -430.952 | 874.020 | 17.658 | 0.000 |
| Aggressive silver foxes | |||||||
| Fixed effect | χ2 | P(χ2) | Model | logLik | AICc | ΔAICc | Akaike weight |
| duration | 0.011 | 0.916 | exluding duration | -135.460 | 283.277 | 0.000 | 0.438 |
| HNR | 1.541 | 0.214 | exluding HNR | -136.225 | 284.807 | 1.530 | 0.204 |
| SCOG | 1.619 | 0.203 | exluding SCOG | -136.264 | 284.884 | 1.607 | 0.196 |
| DF | 2.730 | 0.099 | exluding DF | -136.820 | 285.995 | 2.718 | 0.112 |
| F0 | 4.356 | 0.037 | exluding F0 | -137.633 | 287.621 | 4.345 | 0.050 |
| Unselected silver foxes | |||||||
| Fixed effect | χ2 | P(χ2) | Model | logLik | AICc | ΔAICc | Akaike weight |
| duration | 0.278 | 0.598 | exluding duration | -121.507 | 255.370 | 0.000 | 0.551 |
| DF | 0.808 | 0.369 | exluding DF | -121.772 | 255.901 | 0.530 | 0.423 |
| SCOG | 7.126 | 0.008 | exluding SCOG | -124.931 | 262.218 | 6.847 | 0.018 |
| F0 | 9.381 | 0.002 | exluding F0 | -126.059 | 264.473 | 9.103 | 0.006 |
| HNR | 10.942 | 0.001 | exluding HNR | -126.839 | 266.034 | 10.664 | 0.003 |
| Tame silver foxes | |||||||
| Fixed effect | χ2 | P(χ2) | Model | logLik | AICc | ΔAICc | Akaike weight |
| SCOG | 0.010 | 0.920 | exluding SCOG | -116.492 | 245.340 | 0.000 | 0.399 |
| F0 | 0.095 | 0.757 | exluding F0 | -116.535 | 245.425 | 0.085 | 0.383 |
| DF | 1.691 | 0.193 | exluding DF | -117.333 | 247.021 | 1.681 | 0.172 |
| Duration | 4.336 | 0.037 | exluding duration | -118.655 | 249.666 | 4.325 | 0.046 |
| HNR | 81.549 | <0.001 | exluding HNR | -157.262 | 326.879 | 81.539 | 0.000 |