Table 1.

The results of linear regression of wing length (l_wing) against year by species, including changes between 1964 and 2020 and mean l_wing for species which did not show a significant change

Species	Migratory Strategy	Gradient (m)	Intercept (b)	Adjusted R²	Standard error of residuals	F	P	Mean lwing (mm)	Δ lwing (%)
Atricapilla pratensis	Full	0.020	39.38	< 0.01	3.18	3.04	0.08	80.11	1.43
Erithacus rubecula	Partial	0.004	65.67	< 0.01	2.02	0.58	0.44	73.2	0.29
Oenanthe oenanthe	Full	0.171	-238.63	0.32	4.35	22.94	< 0.01		9.91
Phylloscopus collybita	Full	0.005	50.59	< 0.01	3.01	0.22	0.63	59.75	0.43
Prunella modularis*	Partial	0.029	12.05	< 0.01	2.12	45.21	< 0.01		2.35
Phoenicurus phoenicurus	Full	-0.012	103.42	0.00	2.40	1.69	0.16	78.76	-0.88
Phylloscopus trochilus	Full	0.026	13.69	0.02	3.00	34.14	< 0.01		2.25
Sylvia atricapilla*	Full	0.023	28.02	< 0.05	2.02	28.17	< 0.01		1.77
Sylvia borin*	Full	0.004	69.46	< 0.01	1.83	0.35	0.06	77.49	0.29
Curruca communis*	Full	0.044	-16.43	0.09	2.02	189.30	< 0.01		3.53
Sturnus vulgaris	Partial	0.062	6.31	0.06	3.68	8.61	< 0.01		2.71
Turdus iliacus	Full (winter)	0.025	68.75	0.01	3.00	11.42	< 0.01		1.19
Turdus merula*	Partial	0.010	112.30	< 0.01	2.82	5.643	< 0.05		0.38
Turdus philomelos*	Partial	0.054	9.63	0.07	2.64	40.02	< 0.01		2.62
Troglodytes troglodytes	Partial	0.009	30.31	< 0.01	1.85	3.37	0.07	48.21	1.05

* Species where regressions were conducted using robust standard errors due to heteroscedasticity