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Appendix S1. List of bird species (in alphabetical order) contacted during surveys of the study area, indicating their total abundance (sum of abundance values in all transects) in each season and the Species of European Conservation Concern (SPEC) category.

Appendix S2. Correlation values between consecutive transects for each season.

Appendix S3. Variables defined to measure habitat characteristics and biomass of arthropods and seeds, indicating the model type (food o habitat) in which they were included.

Appendix S4. Results of the Principal Component Analyses (PCA) carried out to explore correlations among variables.

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