Melanin-based color variation in the Bearded Vulture suggests a thermoregulatory function.

作者: Antoni Margalida , Juan José Negro , Ismael Galván

DOI: 10.1016/J.CBPA.2007.10.017

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摘要: We document a case of intraspecific variation in plumage colouration Bearded Vultures that may have arisen as functional response to climate conditions. Two subspecies, Gypaetus barbatus (Eurasia and North Africa populations) meridionalis (Eastern Southern Africa), been described on the basis colour differences. The G. b. tends be darker comparison with meridionalis. two subspecies differ feathering tarsi (more abundant barbatus) presence/absence dark ear tufts (only present barbatus, this being most useful character distinguish adult specimens both subspecies). When exposing skins under sun or electric bulbs cold room, temperature increases were significantly higher black than frontal region head, suggesting melanized patch serves, at least, heat up air entering channel perhaps also underlying skin. In addition, which inhabits mountainous regions harsh long winters, would benefit more from feathered prevent loss through legs.

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