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

Table 2 Linear mixed models for the trip energy consumption rate (average ODBA) and trip duration, against chick age and the foraging habitat

Dependent variable	Factor		Estimated marginal mean or coefficient ± s.e.	χ²₍₁₎	P
Average ODBA (g)	Chick age		−0.002 ± 0.0004	24.0	< 0.001
	Habitat	Terrestrial	0.43 ± 0.01	505.9	< 0.001
	Habitat	Marine	0.63 ± 0.01	505.9	< 0.001
Trip duration (h)	Chick age			50.4	< 0.001
	Habitat	Terrestrial	3.93 ± 0.17	32.0	< 0.001
	Habitat	Marine	2.61 ± 0.23	32.0	< 0.001
	Chick age x habitat	Terrestrial	0.05 ± 0.01	8.7	0.003
	Chick age x habitat	Marine	−0.04 ± 0.01	8.7	0.003

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