Citation
Female Mate Choice Based on Carotenoid-Based Male Plumage Coloration
TL;DR
Brighter red males have better immune function
Foundational research on house finches demonstrating that carotenoid-based plumage coloration serves as an honest signal of male quality. Brighter males have better immune function and higher survival, creating a direct link between signal cost (diverting dietary carotenoids) and honesty.
Key Findings from Hill (2006)
- Brighter red males have better immune function
- Carotenoids must be obtained from diet
- Carotenoids also function as antioxidants
- Color honestly signals health and resource access