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Article
M. Carrete, Auteur ; G. R. Bortolotti, Auteur ; J. A. Sánchez-Zapata, Auteur ; A. Delgado, Auteur ; A. Cortes-Avizanda, Auteur ; J. M. Grande, Auteur ; J. A. Donazar, AuteurAmong European breeding birds, those wintering in the Sahel region have undergone a sustained and severe decline. Long-term data show that variation in primary production of the Sahelian staging area significantly affects survival of many specie[...]
Article
M. G. Forero, Auteur ; G. R. Bortolotti, Auteur ; K. A. Hobson, Auteur ; J. A. Donazar, Auteur ; M. Bertelloti, Auteur ; G. Blanco, Auteur1. Food web interactions in animal communities can be investigated through the measurement of stable isotopes (e.g. delta(15)N, delta(13)C). We used this approach in a community of 14 species of seabirds breeding on the Argentinean Patagonian co[...]
Article
J. J. Negro, Auteur ; J. L. Tella, Auteur ; F. Hiraldo, Auteur ; G. R. Bortolotti, Auteur ; P. Prieto, AuteurDans Ardea (89(2) 2001)We studied seasonal variation in plasma carotenoid levels of captive Red-legged Partridges Alectoris rufa in relation to sex, age and condition. The legs, bill and eye lores in this species are bright red due to carotenoid pigments. Carotenoid l[...]
Article
R. D. Dawson, Auteur ; G. R. Bortolotti, Auteur ; G. L. Murza, AuteurNatural selection theory suggests that there should be fitness consequences for animals that possess morphological abnormalities such as missing or deformed appendages and other structures. As these characters are expected to be detrimental, mor[...]
