1. Universidade da Coruña, School of Sciences, Biology Department, Campus A Zapateira s/n, 15008 A Coruña, Spain.
2. Animal Demography and Ecology Unit, Institut Mediterrani d'Estudis Avançats (CSIC-UIB), Miquel Marquès 21, 07190 Mallorca, Spain.
3. Evolutionary Ecology Department, Museo Nacional de Ciencias Naturales (MNCN), Consejo Superior de Ciencias Naturales (CSIC), José Gutiérrez Abascal 2, 28006 Madrid, Spain.
4. Department of Ornithology, Aranzadi Sciences Society, Zorroagagaina 11, 20014 Donostia, Spain.
5. Centre d'Estudis Avançats de Blanes (CEAB-CSIC), Acces Cala Sant Francesc 14, 17300 Blanes, Spain.