Effects of habitat use on food acquisition and food caching during a nonbreeding season in a winter-breeding, food-storing passerine

Figures & data

Table 1. Foraging habitat selection analysis comparing the proportion (±SD) of area of each habitat and the percentage of foraging attempts in each habitat by male Bull-headed Shrikes. The preference index is indicated by w, see Methods for details.

Habitat	Mean percentage area	Mean percentage of foraging attempts	w	95% confidence intervals for w
Vegetable field	23.9 ± 17.4	50.4 ± 34.2	2.031	[1.302, 2.760]
Rice field	33.5 ± 20.6	34.1 ± 34.7	0.943	[0.572, 1.314]
Abandoned farmland	13.4 ± 12.3	9.2 ± 20.4	0.657	[0.105, 1.209]
Orchard	3.1 ± 6.6	4.2 ± 10.8	0.738	[−0.292, 1.767]
Building	8.9 ± 9.8	1.4 ± 5.7	0.162	[−0.061, 0.386]
Forest	11.0 ± 9.4	0.5 ± 2.7	0.049	[−0.055, 0.153]
Road	5.9 ± 5.1	0.3 ± 1.6	0.111	[−0.101, 0.323]
Pond	0.4 ± 2.1	0.0 ± 0.0	–	–

Figure 1. The relationship between area of vegetable fields in territories of male Bull-headed Shrikes, and the number of food caches stored in their territories during the nonbreeding season.