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Showing 1 to 20 of 75 for “"plumage"”.
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Plumage
Plumage is a stereoscopic 3D experience showcasing the culmination of a personal exploration and observation of birds: a digitally modeled and rendered, fantastical bird referred to simply as a Phoenix. In many cultures birds are tied to ideas of freedom, power, and the otherworldly. Preconceived …
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Investigations of delayed plumage maturation in the orchard oriole
I investigated delayed plumage maturation (DPM) in the orchard oriole Icterus spurius), a dichromatic neo-tropical migrant in which first year males possess a distinct non-definitive plumage. I used model/playback experiments to test predictions of alternative breeding season signaling hypotheses …
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The genetic basis of plumage polymorphism in the black sparrowhawk
… the molecular basis of several aspects of plumage colouration in the black sparrowhawk (Accipiter melanoleucus), an African diurnal bird of prey. The adults of this species occur in two discrete morphs, light and dark. Light morph individuals were found to differ from dark morph individuals …
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Exploring the maintenance of plumage polymorphism in the Black Sparrowhawk
… aims to explore the role and maintenance of plumage colour polymorphism in a raptor, the black sparrowhawk. The black sparrowhawk exhibits discrete colour polymorphism, with adults occurring as either white or dark morphs. Within South Africa, the species has undergone a recent range …
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The mechanisms underlying convergent evolution in the plumage patterns of birds
… mechanisms underlying convergent evolution in plumage patterns: evolutionary genetics, evolutionary development, natural selection for signaling and camouflage. Japanese quail (Coturnix japonica) is a model system in developmental biology. Examining the developmental basis of pattern formation …
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Plumage colouration, testosterone and reproductive behaviour in the red bishop (Euplectes orix)
Leuchtend rotes Gefieder ist ein häufig auftretendes sekundäres Geschlechtsmerkmal bei den Männchen vieler Vogelarten. Es gibt einige Hypothesen, nach denen carotinoid-basierte Gefiederfärbung mit den unterschiedlichsten Aspekten bzw. Merkmalen eines Männchens wie z.B. väterliche Brutpflege, …
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Conservation Taxonomy of the Cuban Parrot: Morphological, Plumage and Flight Call Variation
… reevaluation. I measured 18 morphological and plumage characters from 188 museum specimens representing the six extant and one extirpated island populations. I also examined 11 spectrographic characters from the flight calls of 23 parrots representing all six extant populations. I relied …
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The evolutionary genetics of sexually selected plumage colour traits in the galliform birds
Extravagant male plumage traits in birds are a classic example of sexual selection. However we know very little about the units that selection is acting upon, the genes themselves – what are they and how are they influenced by sexual selection? In this study I focused on in the evolution and …
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Skeletal, plumage, and maceration techniques for separating year classes of bobwhite quail (Colinus virginianus Linnaeus)
Call number: LD2668 .T4 1967 T56
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Skeletal, plumage, and maceration techniques for separating year classes of bobwhite quail (Colinus virginianus Linnaeus)
Call number: LD2668 .T4 1967 T56
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Ultraviolet reflectance of nestling plumage and the provisioning strategies of adult Eastern Phoebes (Sayornis phoebe)
… some species, variation in the extent to which plumage reflects in the UV range provides information about individual quality that influences mate-choice decisions. Less is known about the possible importance of plumage UV reflectance in parent-offspring relationships. The lower breast and belly …
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Colorful eggs and plumage in birds: ecological drivers of color patterns filtered through bird visual systems
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2023-12-01
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PLUMAGE CHARACTERISTICS OF THE LONG-EARED OWL (Asio otus) IN THE VISIBLE AND ULTRAVIOLET SPECTRA OF LIGHT
<p>The study of plumage is a foundational aspect of ornithology, and the features of even a single feather can provide valuable information on an individual’s health, sex, or age. Recent discoveries on the abilities of birds to see in the ultraviolet (UV) spectrum has led to study of the …
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Social and environmental causes and reproductive consequences of ornamented plumage in the Red-backed Fairywren (Malurus melanocephalus)
… typically exhibit ornamented red-black breeding plumage, but this species offers unique opportunities to test the mechanisms that maintain the honesty of ornamented plumage because three-quarters of all one-year-old Red-backed Fairywrens spend their first breeding season in unornamented, brown …
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Reproductive Decisions in American Robins (Turdus Migratorius): Relationships Among Paternity Allocation, Parental Care, Plumage Variation, and Mate Choice
… to mate assortatively based on two melanin-based plumage traits, breast plumage color and tail spot damage. These traits were associated with measures of individual quality and breeding performance, but differed in the information conveyed in each sex. Males with darker plumage color were in …
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Testing the Urban Dulling Hypothesis in an Iridescent Passerine Bird
… carotenoid-colored species. However, iridescent plumage is understudied in general, and little is understood about how environmental changes shape iridescent plumage. This study seeks to identify and explain urbanization-induced coloration differences in an iridescent species for the first time. …
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Glare Reduction by Dark Facial Markings and Bills in Birds
<p>Avian facial plumage, bill coloration, and feather microstructure may serve one or more adaptive functions. Several researchers have proposed that dark eyestripes, bills, and facial masks aid in reducing glare, however, there have been relatively few tests of this hypothesis. Dark facial …
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The ecology and conservation of the white-winged nightjar Caprimulgus candicans
… one year old, while still in pre-definitive plumage. Young males exhibited a form of delayed plumage maturation, whereby they only attained definitive plumage following a prolonged moult spanning much of their first potential breeding season. No evidence was obtained to suggest that they …
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Parental Investment and Male Ornamentation in the Eastern Bluebird (Sialis Sialis)
Bright plumage coloration in most birds is thought to be a product of sexual selection. Brighter, more-ornamented males are preferred by females because their plumage conveys information regarding the quality of the individual. One measure of male quality is willingness to invest in offspring. In …
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Prothonotary Warbler (Protonotaria citrea) Plumage as an Indicator for Infection: the Relationship between Haemosporidia Infection and Breast Feather Reflectance in a Neotropical Migrant Passerine
Yellow avian plumage is a direct result of carotenoid pigments obtained in a bird’s diet and may act as an indicator for individual health, parasite resistance, and status. This study describes breast feather reflectance of adult Prothonotary Warblers (Protonotaria citrea) (n=169), insectivorous …
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