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Figure S1 Temporal variation of the production of resources in the study zone.

Figure S2 Behavioural dynamics predicted by Abrams’ model.

Figure S3 An ilustrative example of the estimation of switching delay (Sylvia melanocephala, Sylvia undata).

Figure S4 Switching trends for each bird species.

Table S1 List of the species, specifying diet and switching behaviour.

Table S2 Least square regression models of the proportion of resources in the diet as a function of resource productivity and morphological traits.

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