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handle: 10261/179036
[ES]: Los Buitres leonados (Gyps fulvus) son responsables de la mayoría de casos de ocupación de nidos del Quebrantahuesos (Gypaetus barbatus). Sin embargo, poco se conoce acerca de cómo ambas especies interaccionan durante la reproducción. Durante la reproducción del Quebrantahuesos estudiamos el comportamiento territorial de cuatro parejas en el Este de los Pirineos (NE España). La frecuencia de comportamientos agonísticos estuvo positivamente correlacionada con el tamaño de las colonias de Buitre leonado. No obstante, no fue observada una elevada frecuencia de interacciones agresivas que resultara significativa y que por tanto sugiera una competencia por el emplazamiento del nido entre ambas especies. A pesar de ello, los Quebrantahuesos mantuvieron una defensa continuada del área inmediata alrededor de los nidos a lo largo de la estación reproductora. Nuestros datos sugieren que el comportamiento territorial del Quebrantahuesos está más asociado a la defensa del espacio reproductivo que a una defensa específica de los nidos.
[EN]: Griffon Vultures (Gyps fulvus) are responsible for most cases of usurpation of nests of Bearded Vultures (Gypaetus barbatus). However, little is known about how both species interact during reproduction. We studied territorial behaviour during the breeding season in four Bearded Vulture pairs in the eastern Pyrenees of northeastern Spain. Frequency of agonistic behavior was positively correlated with Griffon Vulture colony size. However, no significantly higher frequency of aggressive interactions was found that suggested actual competition for nest sites between these species. Nonetheless, Bearded Vulture pairs maintained a continuous defence of the area immediately surrounding their nests throughout the breeding season. Our data suggest that the Bearded Vulture's territorial behavior was more closely associated with defence of breeding space than with specific defence of actual nest sites.
This study was supported by the Departament d'Agricultura Ramaderia i Pesca de la Generalitat de Catalunya, Fundació Territori i Paisatge, and a LIFE Program of the European Union (94/E/A221/E/01126/ASJ).
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