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Appendix S1 Raw presence–absence data on bird species from the two atlas surveys in the Valsessera, Italian Alps (1992–94 and 2003–05), used for the community and for the species approaches.

Appendix S2 List of the bird species considered in the ordinations, together with the number of squares they occupied in the two surveys; their mean elevation index , computed from the available data (see Materials and methods); their European trends according to the EBCC Pan-European Common Birds Monitoring Scheme; and their classification as forest and non-forest species.

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