Table 3 The effect of the broadcasted information types and isolation metrics on song thrush relative abundance (difference in abundance between 2018 and 2017, and 2019 and 2017).
Explanatory variables | Song thrush relative abundance in 2018 (GAMM 4) | Song thrush relative abundance in 2019 (GAMM 5) | |
|---|---|---|---|
GAMM estimates of function slopes with standard errors (in brackets) for linear predictors | |||
Intercept | −4.796 (0.938)*** | −3.669 (0.981)*** | |
Broadcast: Procedural control | −0.077 (0.332) | −0.102 (0.358) | |
Broadcast: Attractive | 0.111 (0.328) | 0.195 (0.345) | |
Broadcast: Repulsive | −0.761 (0.346)* | −0.529 (0.371) | |
Broadcast: Mixed | −0.266 (0.322) | −0.208 (0.345) | |
Survey: 2 | −1.398 (0.717) | −0.047 (0.568) | |
Survey: 3 | 0.359 (0.308) | 0.369 (0.256) | |
Mean Accipiter: sp0.5 | 0.209 (0.245) | −0.285 (0.250) | |
Mean Accipiter: sp1 | 1.429 (0.815) | −0.247 (0.950) | |
Mean Turdus: sp0.5 | −0.180 (0.935) | −0.360 (0.999) | |
Mean Turdus: sp1 | 0.524 (0.934) | −0.002 (0.963) | |
Mean Turdus: sp1.5 | 0.843 (0.961) | 0.249 (0.999) | |
Mean Turdus: sp2 | 0.841 (1.141) | 1.477 (1.141) | |
Number of loudspeakers | 0.118 (0.123) | −0.001 (0.141) | |
Effective degrees of freedom are given, approximate significance of smooth terms | |||
log(NNDist) | 0.001 | 0.001 | |
log(Forest area) | 0.001 | 0.502 | |
log(NNDist) × Broadcast: Control | 0.000 | 1.192* | |
log(NNDist) × Broadcast: Procedural Control | 1.540*** | 0.398 | |
log(NNDist) × Broadcast: Attractive | 0.000 | 0.000 | |
log(NNDist) × Broadcast: Repulsive | 0.000 | 0.000 | |
log(NNDist) × Broadcast: Mixed | 0.165 | 0.000 | |
log(Area) × Broadcast: Control | 0.001 | 0.001 | |
log (Area) × Broadcast: Procedural Control | 0.660 | 0.000 | |
log(Area) × Broadcast: Attractive | 1.350* | 0.077 | |
log(Area) × Broadcast: Repulsive | 0.000 | 0.102 | |
log(Area) × Broadcast: Mixed | 0.000 | 0.000 | |
X,Y | 1.939 | 0.000 | |
Mean date (numeric) | 2.007** | 0.820 | |
Mean Survey start time | 0.001 | 0.000 | |
Mean Temperature | 0.522 | 0.921*** | |
Mean Cloudiness | 1.485* | 0.524 | |
Mean Number of other bird species | 3.616*** | 0.929* | |
Forest identity (random effect) | 3.495 | 0.004 | |
Deviance explained (%) | 27.7 | 13.3 | |
