High individual repeatability of the migratory behaviour of a long-distance migratory seabird

Table 3 Repeatability (R) of the distance, phenology and spatial distribution of common tern migration, with and without including year as a fixed effect in the models. Note that all models included sex as a fixed effect

Trait	A. sex- & year-specific repeatability			B. sex-specific repeatability
Trait	R ± SE	95% CI	p-value	R ± SE	95% CI	p-value
migration distance
total migration distance in autumn^a	0.937 ± 0.015	0.906–0.963	< 0.001	0.934 ± 0.017	0.895–0.959	< 0.001
total migration distance in spring^c	0.925 ± 0.021	0.881–0.961	< 0.001	0.907 ± 0.025	0.851–0.947	< 0.001
phenology
departure date from colony^a	0.719 ± 0.063	0.579–0.827	< 0.001	0.571 ± 0.081	0.391–0.717	< 0.001
arrival date at wintering area^a	0.630 ± 0.080	0.473–0.764	< 0.001	0.533 ± 0.090	0.318–0.692	< 0.001
total duration of autumn migration^a	0.661 ± 0.072	0.503–0.795	< 0.001	0.630 ± 0.080	0.448–0.759	< 0.001
length of stay at wintering area^b	0.638 ± 0.089	0.451–0.796	< 0.001	0.598 ± 0.095	0.392–0.751	< 0.001
departure date from wintering area^b	0.358 ± 0.130	0.100–0.618	< 0.001	0.368 ± 0.130	0.084–0.611	< 0.001
arrival date at colony^c	0.745 ± 0.064	0.617–0.872	< 0.001	0.713 ± 0.075	0.550–0.837	< 0.001
total duration of spring migration^c	0.646 ± 0.085	0.492–0.804	< 0.001	0.662 ± 0.085	0.475–0.806	< 0.001
spatial distribution
wintering area longitude^a	0.998 ± 0.001	0.997–0.999	< 0.001	0.998 ± 0.001	0.997–0.999	< 0.001
wintering area latitude^a	0.979 ± 0.005	0.970–0.988	< 0.001	0.973 ± 0.007	0.958–0.983	< 0.001

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