Table 4.
Influence of predictor variables on behavioural responses
| Predictor variable | Estimates | SE | P* |
|---|---|---|---|
| a. Conspecific model | |||
| Age | 0.023 | ||
| Age (old juvenile) | − 2.19 | 1.29 | |
| Age (young juvenile) | − 4.12 | 1.5 | |
| Playback stimulus | 0.035 | ||
| Playback stimulus (eagle) | − 3.13 | 1.46 | |
| Playback stimulus (snake) | − 3.87 | 1.5 | |
| Stratum | 0.876 | ||
| Stratum (understory) | 0.2 | 1.33 | |
| Audience | 0.276 | ||
| Audience (yes) | 1.19 | 1.09 | |
| b. Heterospecific model | |||
| Age | 0.004 | ||
| Age (old juvenile) | − 1.59 | 0.78 | |
| Age (young juvenile) | − 2.87 | 0.88 | |
| Playback stimulus | 0.208 | ||
| Playback stimulus (eagle) | 0.66 | 0.95 | |
| Playback stimulus (tree) | 1.43 | 0.81 | |
| Stratum | 0.157 | ||
| Stratum (understory) | 1.13 | 0.8 | |
| Audience | 0.808 | ||
| Audience (yes) | − 0.16 | 0.68 | |
| c. Interspecific model | |||
| Caller species | 0.001 | ||
| Caller species (Diana monkey) | − 5.02 | 1.56 | |
| Age | 0.001 | ||
| Age (old juvenile) | − 2.98 | 1.05 | |
| Age (young juvenile) | − 3.92 | 1.1 | |
| Playback stimulus | 0.02 | ||
| Playback stimulus (eagle) | − 3.27 | 1.41 | |
| Stratum | 0.065 | ||
| Stratum (understory) | 1.89 | 1.03 | |
| Audience | 0.082 | ||
| Audience (yes) | 1.56 | 0.89 | |
| Caller species * Playback stimulus | 0.011 | ||
| Caller species (Diana monkey)*Playback stimulus (eagle) | 4.48 | 1.77 | |
() denote the variable level that reflects the estimate when tested against the alternative level: Eagle and Snake vs Leopard, Old and Young juvenile vs Adult, Understory vs Ground, Audience vs Alone, Diana monkey vs Sooty Mangabey
*The critical P value related to the test predictors was set at 0.05