Spatial and temporal variation in the avian-frugivore assemblage of Prunus mahaleb: patterns and consequences [thrushes, redstarts, warblers, tits, chaffinches]

biodiversidad biodiversity biogeografia biogeographie biogeography birds ecosistema ecosystems espagne especies feeding preferences fruits frutas graine habitat habitats oiseau plant population preferencias alimentarias prunus mahaleb seasonal variation seed dispersal seeds semilla spain species