Results 251 to 260 of about 19,383 (290)

EFFECTS OF SPECIMEN AGE ON PLUMAGE COLOR

The Auk, 2008
Abstract Museum specimens are valuable for studies of plumage color in birds, but feather color may fade over time and not accurately reflect the colors of live birds. In particular, it has been suggested that ultraviolet (UV) color may be more susceptible to degradation than human-visible colors.
JESSICA K. ARMENTA, PETER O. DUNN, LINDA A. WHITTINGHAM   +2 more
openaire   +1 more source

Mechanism of carotenoid coloration in the brightly colored plumages of broadbills (Eurylaimidae)

Journal of Comparative Physiology B, 2014
The plumage carotenoids of six species from five genera of broadbills (Eurylaimidae) have been examined. These plumages are crimson, violet, purple-maroon, or yellow. Two genera also have brilliant green plumages that are produced by a combination of structural coloration and unknown carotenoids.
Richard O, Prum, Amy M, LaFountain, Christopher J, Berg, Michael J, Tauber, Harry A, Frank   +4 more
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Pheomelanin-Based Plumage Coloration Predicts Survival Rates in Birds

Physiological and Biochemical Zoology, 2013
Higher vertebrates synthesize two forms of melanin: eumelanin and pheomelanin. While the adaptive functions of eumelanin are diverse, those of pheomelanin, which is phototoxic and whose production consumes a key intracellular antioxidant (glutathione), are not clear apart from being involved in color patterns that confer concealment.
Ismael, Galván, Anders P, Møller
openaire   +2 more sources

Plumage Coloration Predicts Haemosporidian Infection Occurrence in Birds

Ardea, 2020
Carotenoids are exogenously sourced pigments that determine plumage coloration in many species of birds. Aside from plumage coloration, carotenoids play a role in mounting an immune response and neutralizing the by-products of cytotoxic activity. We determined whether colorimetric descriptors of carotenoid-based plumage predict infection occurrence of ...
Victor A.S. Penha, Regiane Rodrigues, Agustín Ignacio Quaglia, Patrícia Giovana Hoepers, Kleber Del-Claro, Letícia Soares   +5 more
openaire   +1 more source

The Puzzle of Colorful Plumage

ACADEMIA. The magazine of the Polish Academy of Sciences
Scientists are investigating how and why birds have developed such colorful feathers, often adorned with extravagant ornaments.
openaire   +1 more source

BRIGHTLY COLORED PLUMAGE IN FEMALE MANAKINS PIPRA

1981
(Uploaded by Plazi from the Biodiversity Heritage Library) No abstract provided.
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Delayed maturation of plumage coloration and plumage spottedness in the Barn Owl (Tyto alba)

Journal für Ornithologie, 1999
The Barn Owl (Tyto alba) varies in plumage from dark reddish-brown to white, and from heavily marked with black spots to immaculate. Males are commonly lighter coloured and less spotted than females. I assessed whether male and female Barn Owls delay the full expression of plumage coloration and spottedness to the second year of life. In Switzerland, I
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Automated Bird Plumage Coloration Quantification in Digital Images

2014
Quantitative measurements of bird plumage color and patch size provide valuable insights into the impact of environmental conditions on the habitat and breeding of birds. This paper presents a novel perceptual-based framework for the automated extraction and quantification of bird plumage coloration from digital images with slowly varying background ...
Tejas S. Borkar, Lina J. Karam
openaire   +1 more source

Plumage Color and Energetics

The Condor, 1971
openaire   +1 more source

Natural and Synthetic Flavylium-Based Dyes: The Chemistry Behind the Color

Chemical Reviews, 2022
Luis Cruz, Nuno Basílio, Nuno Mateus
exaly