Time and energy costs of different foraging choices in an avian generalist species

Table 1 Binomial GLM for the proportion of marine trips, against the interaction between chick age, sex of the individual and period of the week

Dependent variable	Factor		Estimated marginal mean or coefficient ± s.e.	χ²₍₁₎	P
Proportion of marine trips	Chick age			0.6	0.454
	Chick age x sex			0.01	0.929
	Chick age x weekend			5.4	0.020
	Sex	Female		8.2	0.004
	Sex	Male		8.2	0.004
	Weekend	Working day		36.2	< 0.001
	Weekend	Weekend		36.2	< 0.001
	Sex x weekend			11.0	0.001
	Female	Working day	0.17 ± 0.06
	Female	Weekend	0.03 ± 0.01
	Male	Working day	0.42 ± 0.1
	Male	Weekend	0.18 ± 0.06
	Chick age x sex x weekend			5.9	0.015
	Female	Working day	−0.001 ± 0.001
	Female	Weekend	0.001 ± 0.001
	Male	Working day	−0.002 ± 0.002
	Male	Weekend	−0.004 ± 0.003

Estimate values are back-transformed from the logit scale. Estimated marginal means are the estimated mean for a factor level or a factor level combination. Output of the corresponding analyses of deviance for the significance of the model terms
s.e., standard error

ISSN: 2051-3933