1. Department of Evolutionary Ecology; Doñana Biological Station - CSIC; Sevilla Spain
2. Research Unit of Biodiversity - UOCSIC-PA, Oviedo University; Mieres Spain
3. Institute for Game and Wildlife Research; IREC - CSIC-UCLM-JCCM; Ciudad Real Spain
4. Labor - Laboratório de Ornitologia, Instituto de Ciências Agrárias e Ambientais Mediterrânicas; University of Evora; Évora Portugal
5. Pyrenean Institute of Ecology (IPE) - CSIC; Zaragoza Spain