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Table 1 GAM results for (a) predation of and (b) fox occurrence at artificial nests

From: No evidence for spatial variation in predation risk following restricted-area fox culling

(a) Model nest predation
Predictors Estimate SE z-value p-value
Intercept − 0.463 0.255 − 1.819 0.069
Edge-Yes 0.097 0.265 0.367 0.714
Year-2018 0.323 0.283 1.141 0.254
Session-2 − 0.273 0.259 − 1.055 0.291
Predictors Edf χ 2 p-value
Prop. Forest < 0.01 0 0.549
Edge Dist. 0.481 1.013 0.131
Hum. Dist. < 0.01 0 0.809
Hunt. Bag 0.725 1.771 0.101
Fox Abund. 0.885 3.890 0.021
%shrub < 0.01 0 0.760
Slope 0.581 1.267 0.128
NcV < 0.01 0 0.508
NcH_1m < 0.01 0 0.349
NcH_3m 0.502 0.973 0.158
NcH_can < 0.01 0 0.790
(b) Model fox occurrence
Predictors Estimate SE z-value p-value
Intercept − 1.047 0.296 − 3.542 < 0.001
Edge-Yes 0.047 0.276 0.171 0.864
Year-2018 0.558 0.303 1.843 0.065
Session-2 − 0.162 0.274 − 0.589 0.556
Pred.-Yes 1.514 0.270 5.600 < 0.001
Predictors Edf χ 2 p-value
Shannon < 0.01 0 1.000
Edge Dist. < 0.01 0 0.648
Hum. Dist. < 0.01 0 0.893
Hunt. Bag < 0.01 0 0.543
Fox Abund. 1.075 8.581 0.001
%shrub < 0.01 0 0.310
Slope 0.323 0.470 0.220
NcV 0.328 0.406 0.261
  1. Edge-Yes: artificial nest within 100 m of forest habitat edge; Prop. Forest: proportion of land cover forest within 250 m around plot; Shannon: Shannon index of landscape heterogeneity; Edge Dist: Distance to forest edge; Hum. Dist: distance to closest settlement; Hunt. Bag: size of normalized hunting bag in area around plot (foxes/km2); Fox Abund: emprirical fox abundance in landscape around plot (mean nr. foxes); %shrub: percentage of ground covered by structures hindering fox movement; Nc: nest cover (vertical; horizontal at three levels: 1 m, 3 m and canopy level)
  2. Parameter estimates, standard errors and p-values are provided for factor covariates (top section); estimated degrees of freedom and p-values (without considering uncertainty in smoothing parameter estimates) are provided for the smooth terms (bottom section). Predictors of Fig. 2 are highlighted italics