Melanin-based color of plumage: role of condition and of feathers' microstructure

Integrative and Comparative Biology
By: , and 

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Abstract

Whether melanin-based colors honestly signal a bird's condition during the growth of feathers is controversial, and it is unclear if or how the physiological processes underlying melanogenesis or color-imparting structural feather microstructure may be adversely affected by condition. Here we report results from two experiments designed to measure the effect of condition on expression of eumelanic and pheomelanic coloration in black-capped chickadees (Poecile atricapillus) and zebra finches (Taeniopygia guttata), respectively. In chickadees, we compared feathers of birds affected and unaffected by avian keratin disorder, while in zebra finches we compared feathers of controls with feathers of those subjected to an unpredictable food supply during development. In both cases we found that control birds had brighter feathers (higher total reflectance) and more barbules, but similar densities of melanosomes. In addition, the microstructure of the feathers explained variation in color more strongly than did melanosome density. Together, these results suggest that melanin-based coloration may in part be condition-dependent, but that this may be driven by changes in keratin and feather development, rather than melanogenesis itself. Researchers should be cautious when assigning variation in melanin-based color to melanin alone and microstructure of the feather should be taken into account.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Melanin-based color of plumage: role of condition and of feathers' microstructure
Series title Integrative and Comparative Biology
DOI 10.1093/icb/icu094
Volume 54
Issue 4
Year Published 2014
Language English
Publisher Society for Integrative and Comparative Biology
Publisher location McLean, VA
Contributing office(s) Contaminant Biology Program, Alaska Science Center Biology WTEB
Description 12 p.
First page 633
Last page 644
Online Only (Y/N) N
Additional Online Files (Y/N) N