Table 1 Dependent variables considered in this study and their description, as well as the model species considered for each of the season (breeding: 15th April to 15th July, post-breeding migration: 16th July to 15th October and wintering: 15th November to 15th February) that were included in the statistical analyses (all = every sampled bird of all species)

Relative abundance

Sampled birds (n)/ringing days (n)

All, Acrocephalus scirpaceus^a,c, Cettia cetti^a,e

All, Acrocephalus schoenobaenus^a,c, Acrocephalus scirpaceus^a,c, Phylloscopus trochilus^b,c

All, Cettia cetti^a,e, Emberiza schoeniclus^a,d, Phylloscopus collybita^b,d

Species richness

Sampled species (n)/ringing days (n)

All

All

All

Proportion of juvenile birds¹

[Juvenile birds (n)/adult birds (n)]/ringing days (n)

Acrocephalus scripaceus^a,c, Cettia cetti^a,e

Acrocephalus schoenobaenus^{a c}, Acrocephalus scirpaceus^{a c}, Phylloscopus trochilus^{b c}

Cettia cetti^a,e, Emberiza schoeniclus,^a,d, Phylloscopus collybita^b,d

Sex ratio

[Males (n)/females (n)]/ringing days (n)

Acrocephalus scripaceus^a.c, Cettia cetti^a,e

None²

Cettia cetti^a,e, Emberiza schoeniclus^a,d

Subcutaneous fat

Average fat score of the sampled birds/ringing days (n)

Acrocephalus scripaceus^a,c, Cettia cetti^a,e

Acrocephalus schoenobaenus^a,c, Acrocephalus scirpaceus, Phylloscopus trochilus^b,c

Cettia cetti^a,e, Emberiza schoeniclus^a,d, Phylloscopus collybita^b,d

Body condition

[Average values of residuals of weight (g)/length of third primary feather (mm)]/ringing days (n)

Acrocephalus scripaceus^a,c, Cettia cetti^a,e

Acrocephalus schoenobaenus^a,c, Acrocephalus scirpaceus^a,c, Phylloscopus trochilus^b,c

Cettia cetti^a,e, Emberiza schoeniclus^a,d, Phylloscopus collybita^b,d