Table 3.

Statistical significance of inter-annual variation in feather length (length of third outermost primary feather) for the species included in this study

Species	n	F	P	Adjusted R 2
Dunnock	531	0.857	0.463	<0.001
Robina	1,535	3.936	<0.001	0.017
Song thrush	266	1.256	0.261	0.012
Blackbirda	1,131	4.000	<0.001	0.024
Garden warblera	307	2.080	0.031	0.036
Blackcapa	4,390	12.920	<0.001	0.024
Reed warblera	1,527	9.455	<0.001	0.048
Willow warblera	1,406	4.561	<0.001	0.022
Chiffchaffa	8,717	13.080	<0.001	0.012
Great tita	856	4.751	<0.001	0.039
Blue tita	2,149	9.125	<0.001	0.033
Reed bunting	3,756	1.659	0.093	0.002

Shown are the F- and P-values, and the adjusted R ² of the smoothing term (year) from GAM

^aSpecies for which the inter-annual variation was statistically significant