An example of plumage colour change after moult by climatic displacemeut in a Varied Tit
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چکیده
منابع مشابه
Seasonal Changes in Colour: A Comparison of Structural, Melanin- and Carotenoid-Based Plumage Colours
BACKGROUND Plumage coloration is important for bird communication, most notably in sexual signalling. Colour is often considered a good quality indicator, and the expression of exaggerated colours may depend on individual condition during moult. After moult, plumage coloration has been deemed fixed due to the fact that feathers are dead structures. Still, many plumage colours change after moult...
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Moult speed affects structural feather ornaments in the blue tit.
Growing evidence suggests that structural feather colours honestly reflect individual quality or body condition but, contrary to pigment-based colours, it is not clear what mechanism links condition to reflectance in structural feather colours. We experimentally accelerated the moult speed of a group of blue tits (Cyanistes caeruleus) by exposing them to a rapidly decreasing photoperiod and com...
متن کاملPositive assortative pairing by plumage colour in Spanish imperial eagles.
Intraspecific variation in plumage may have a functional significance in mate choice. As a result, breeding birds are often paired assortatively with respect to colour. However, whether this within-pair correlation is a result of homotypic preference whereby individuals pick a mate that looks like themselves, or directional preference whereby all individuals have the same phenotypic preference,...
متن کاملIs oxidative status influenced by dietary carotenoid and physical activity after moult in the great tit (Parus major)?
In the context of sexual and natural selection, an allocation trade-off for carotenoid pigments may exist because of their obligate dietary origin and their role both in the antioxidant and immune systems and in the production of coloured signals in various taxa, particularly birds. When birds have expended large amounts of carotenoids to feather growth such as after autumn moult, bird health a...
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ژورنال
عنوان ژورنال: Japanese Journal of Ornithology
سال: 1962
ISSN: 0040-9480,1881-9702
DOI: 10.3838/jjo1915.17.204