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Article
Jose J. Cuervo, Auteur ; Juan J. Soler, Auteur ; Jesus M. Aviles, Auteur ; Tomas Perez-Contreras, Auteur ; Carlos Navarro, AuteurHematocrit, the proportion of blood volume occupied by packed red blood cells, is frequently used as an estimate of phenotypic condition. Some studies in birds, however, suggest that hematocrit might not always be a good estimate of condition. W[...]
Article
Carlos Navarro, Auteur ; Tomas Perez-Contreras, Auteur ; Jesus M. Aviles, Auteur ; Kevin J. McGraw, Auteur ; Juan J. Soler, AuteurThe hypothesis that eggshell colouration is a sexually selected trait of female birds is based on the fact that biliverdin, the pigment responsible for blue-green colours of the eggshell, is a potent antioxidant and that only females with high a[...]
Article
Roger Jovani, Auteur ; Julio Blas, Auteur ; Carlos Navarro, Auteur ; Francois Mougeot, AuteurGrowth bands are alternate dark/light bands perpendicular to the feather rachis. Previous studies indicate that pairs of dark/light bands are grown every 24h, with light bands being produced at night, and dark ones during the day. Thus, the dark[...]
