Lecture_14-2 - Display of colored objects Revealed plumage...

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Evidence for condition dependence: 1. Structural color relates to parasite load in some species 2. Minor nutritional disruption during molt affects structural color. Two other methods of producing color: Cosmetic – exogenous modification for use as sexual signals or camouflage Adventitious – normal wear and tear of feather Three types of cosmetic: Applied cosmetic – modification of the bird’s own appearance
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Unformatted text preview: Display of colored objects Revealed plumage colors – deliberate abrasion Adventitious color alteration can result from: 1. Dirt and staining – againt the ground 2. UV damage 3. Abrasion – male male competion. .leads to aggressive behavior 4. Bacterial degradation – low immune system...
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