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In dynamic selection regimes, an honest signal that indicates high quality in favorable environments might be negatively related to quality in unfavorable environments, though empirical evidence is scarce. Here, we studied the relationship between plumage ornaments and physiological state in the Pacific swallow Hirundo tahitica on Amami Oshima Island in 2 years with contrasting weather conditions:...
Plumage color is a composite trait and each component can provide information regarding individual quality. Melanin-based color is one of the most common plumage coloration in birds. This color comprises two types of melanin pigments: eumelanin (black pigment) and pheomelanin (yellow-reddish pigment), and it is affected by several post-molting processes such as UV damage, staining, and preen...
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