منابع مشابه
Variation in carotenoid-protein interaction in bird feathers produces novel plumage coloration.
Light absorption by carotenoids is known to vary substantially with the shape or conformation of the pigment molecule induced by the molecular environment, but the role of interactions between carotenoid pigments and the proteins to which they are bound, and the resulting impact on organismal coloration, remain unclear. Here, we present a spectroscopic investigation of feathers from the brillia...
متن کاملSpectral reflectance and directional properties of structural coloration in bird plumage.
Bird plumage is coloured both by pigments and by spectrally selective interference in the light reflected from feather barbs. These barbs are composites of high- and low-refractive-index materials, and light is reflected at refractive index boundaries. The spatial structure determines the wavelengths where constructive interference occurs and, hence, the spectral tuning. The spectral tuning of ...
متن کاملContribution of double scattering to structural coloration in quasiordered nanostructures of bird feathers.
We measured the polarization- and angle-resolved optical scattering and reflection spectra of the quasiordered nanostructures in the bird feather barbs. In addition to the primary peak that originates from single scattering, we observed a secondary peak which exhibits depolarization and distinct angular dispersion. We explained the secondary peak in terms of double scattering, i.e., light is sc...
متن کاملBird population declines due to radiation exposure at Chernobyl are stronger in species with pheomelanin-based coloration PHYSIOLOGICAL ECOLOGY - ORIGINAL PAPER Bird population declines due to radiation exposure at Chernobyl are stronger in species with pheomelanin-based coloration
Eumelanin and pheomelanin are the most common pigments providing color to the integument of vertebrates. While pheomelanogenesis requires high levels of a key intracellular antioxidant (glutathione, GSH), eumelanogenesis is inhibited by GSH. This implies that species that possess the molecular basis to produce large amounts of pheomelanin might be more limited in coping with environmental condi...
متن کاملCarotenoid-based coloration, condition, and immune responsiveness in the nestlings of a sexually dimorphic bird of prey.
In many birds, nestlings exhibit brightly colored traits that are pigmented by carotenoids. Carotenoids are diet limited and also serve important health-related physiological functions. The proximate mechanisms behind the expression of these carotenoid-pigmented traits are still poorly known, especially in nestlings with sexual size dimorphism. In these nestlings, intrabrood competition levels ...
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ژورنال
عنوان ژورنال: The Auk
سال: 2007
ISSN: 1938-4254,0004-8038
DOI: 10.1093/auk/124.3.1097