Détail de l'auteur
Documents disponibles écrits par cet auteur (10)
Ajouter le résultat dans votre panier Affiner la recherche
Article
A. V. Badyaev, Auteur ; G. E. Hill, AuteurThe extent and diversity of sexual dichromatism in birds is thought to be due to the intensity of current sexual selection on the plumage ornamentation of males and females. This view leads to an expectation of concordance between ecological con[...]
Article
L. Siefferman, Auteur ; G. E. Hill, AuteurPlumage coloration has been suggested to serve as an honest signal of benefits that males provide to females. One benefit proposed for females that choose to mate with elaborately colored males is that such males might provide more food resource[...]
Article
M. D. Shawkey, Auteur ; S. R. Pillai, Auteur ; G. E. Hill, AuteurAnti-microbial activity is a commonly suggested but rarely tested property of avian uropygial oil. Birds may defend themselves against feather-degrading and other potentially harmful bacteria using this oil. We preliminarily identified 13 bacter[...]
Article
A. M. Stoehr, Auteur ; G. E. Hill, AuteurThe majority of studies examining the role of hormones in the proximate mechanisms of plumage coloration in birds have focused on intersexual differences (plumage dichromatism) and on structural- or melanin-based plumage coloration. The relation[...]
Article
G. E. Hill, AuteurCarotenoid pigments are used by many bird species as feather colorants, creating brilliant yellow, orange, and red plumage displays. Such carotenoid-based plumage coloration has been shown to function as an honest signal that is used in female m[...]
Article
L. Siefferman, Auteur ; G. E. Hill, Auteur ; F. S. Dobson, AuteurMale eastern bluebirds Sialia sialis have striking ultraviolet (UV)-blue coloration on their heads, backs, rumps, wings, and tails and bold chestnut coloration on their breasts. These colored areas are ornaments that correlate with pairing date [...]
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
G. E. Hill, AuteurThe redness of carotenoid pigmentation has been shown to be an indicator of individual condition. I tested whether the asymmetry of carotenoid pigmentation of male House Finches Carpodacus mexicanus, an indicator of developmental stability, decr[...]
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
M. D. Shawkey, Auteur ; M. L. Beck, Auteur ; G. E. Hill, AuteurFeather growth bar widths have become a standard index of nutritional condition in ornithological research. Traditional techniques of measuring these bars are difficult and slow because the bars are often hard to see. We present a fast and repea[...]
