DIET, PLASMA CAROTENOIDS, AND SEXUAL COLORATION IN THE ZEBRA FINCH (TAENIOPYGIA GUTTATA)

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No simple measures for antioxidant status in birds: complexity in inter‐ and intraspecific correlations among circulating antioxidant types (2009, background): “ McGraw et al. 2003a; McGraw & Gregory 2004).”
Testosterone upregulates lipoprotein status to control sexual attractiveness in a colorful songbird (2006, methodology): “We measured plasma T, plasma cholesterol, plasma carotenoids , and beak color in a captive, nonbreeding population of 13 males (see McGraw et al. 2003a for housing conditions and diet).”
The physiological costs of being colourful: nutritional control of carotenoid utilization in the American goldfinch, (2005, unknown): “…where the yellow dietary carotenoids lutein and zeaxanthin are converted into yellow plumage carotenoids (the canary xanthophylls; McGraw et al. 2001, 2002c) by the removal of two hydrogen atoms (the process of dehydrogenation) that likely occurs via a single step and enzyme (McGraw et al. 2003a).”
Female American goldfinches use carotenoid-based bill coloration to signal status (2009, background): “Similarly, both sexes in other species with red–orange bills exhibit a positive correlation between bill color and plasma carotenoid levels (zebra finch, McGraw et al. 2003; Alonso-Alvarez et al. 2004; red-legged partridge, Alectoris rufa, Pérez-Rodríguez 2008).”