Inter-individual differences in foraging tactics of a colonial raptor: consistency, weather effects, and fitness correlates

Table 2 Spatio-temporal descriptors and ODBA of static (SF) vs. dynamic foraging (DF) trips

Variable	SF trips (n = 157)	DF trips (n = 332)	Estimate [95% CI]	F	df	P	Marginal R²	Conditional R²
Trip duration (h)	2.44 ± 1.54	1.04 ± 0.74	−1.31 [−1.52, −1.11]	156.7	1, 485	< 0.001	0.24	0.37
Trip length (km)	18.22 ± 9.83	17.49 ± 8.72	− 0.72 [−2.46, 1.02]	0.65	1, 486	0.42	0.01	0.18
Maximum distance (km)	5.73 ± 2.50	6.10 ± 2.28	−0.01 [−0.43, 0.42]	0.01	1, 486	0.99	0.01	0.26
Tortuosity	3.19 ± 0.90	2.88 ± 0.83	−0.10 [−0.25, 0.06]	1.55	1, 485	0.21	0.01	0.30
ODBA^a	0.21 ± 0.08	0.42 ± 0.09	0.14 [0.13, 0.16]	292.7	1, 426	< 0.001	0.38	0.56

The effect of trip type (SF = 0, DF = 1) on trip descriptors and ODBA was assessed by linear mixed models including individual identity as a random intercept effect. Marginal (proportion of variance explained by fixed effects) and conditional (proportion of variance explained including both fixed and random effects) R² were estimated by means of the R package “performance” [44]. Mean values ± SD are reported. Degrees of freedom for the F-tests were estimated according to the Kenward-Roger approximation. Important effects (whose 95% CI do not include zero) are bolded

ISSN: 2051-3933