Table 2.

Parameter estimates for linear models fitted with the finite population correction explaining Northern Gannet Morus bassanus colony means for foraging trip duration and maximum distance for 21 colonies. Delta (Δ) pseudo-adjusted r² is the difference in pseudo-adjusted r² between the models with and without the explanatory variable included and are thus a measure of the contribution of each variable to explaining the variation in foraging effort.

foraging effort	explanatory variable	estimate ± s.e.	2log LR	d.f.	p value	Δ pseudo r2
trip duration (h) ~	intercept	27.808 ± 6.246	—	—	—	—
	√colony size	0.065 ± 0.007	78.15	1,18	<0.001	0.41
	latitude	−0.350 ± 0.101	11.99	1,18	0.003	0.08
maximum distance (km) ~	intercept	94.623 ± 37.554	—	—	—	—
	√colony size	0.521 ± 0.058	81.514	1,18	<0.001	0.62
	latitude	−1.202 ± 0.620	2.423	1,18	0.071	0.02