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Article
K. J. McGraw, Auteur ; L. S. Hardy, AuteurCarotenoid pigments produce the red, orange, and yellow plumage of many birds. Carotenoid-containing feathers are typically rich in color and displayed by all adult members of the species. In many gulls and terns, however, an unusual light pink [...]
Article
K. J. McGraw, AuteurFor decades, carotenoids have attracted attention for their roles as vitamin-A precursors, antioxidants, and immunostimulants, but we still understand very little about the metabolic processes that accompany these compounds. Animals like birds u[...]
Article
A. M. Stoehr, Auteur ; K. J. McGraw, Auteur ; P. M. Nolan, Auteur ; G. E. Hill, AuteurStudies that quantify parental care in birds are often faced with the confounding effects of variation in brood size. That is, nestlings from broods of varying sizes may receive different quantities of food for reasons not entirely related to th[...]
Article
K. J. McGraw, Auteur ; A. M. Stoehr, Auteur ; P. M. Nolan, Auteur ; G. E. Hill, AuteurDarwin (1871) and later Fisher (1958) suggested that sexual selection can drive the evolution of ornamental traits in monogamous species when female preferences for these traits allow well-ornamented males to begin breeding earlier in a season a[...]
Article
K. J. McGraw, Auteur ; K. Wakamatsu, Auteur ; A. B. Clark, Auteur ; K. Yasukawa, AuteurOver the past three decades, the red-winged blackbird Agelaius phoeniceus has served as a model species for studies of sexual selection and the evolution of ornamental traits. Particular attention has been paid to the role of the colorful red-an[...]
Article
H. L. Mays, Auteur ; K. J. McGraw, Auteur ; G. Ritchison, Auteur ; S. Cooper, Auteur ; V. Rush, Auteur ; R. S. Parker, AuteurSexual dimorphism or dichromatism has long been considered the result of sexual selection. However, for many organisms the degree to which sexual dichromatism occurs has been determined within the confines of human perception. For birds, objecti[...]
