An update on the honesty of melanin-based color signals in birds

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128 Scopus citations


The control mechanisms and information content of melanin-based color signals in birds have generated much recent interest and controversy among evolutionary biologists. Initial experimental studies on this topic manipulated coarse metrics of an individual's condition (i.e. food intake, disease state) and failed to detect significant condition-dependence of melanin ornament expression. However, three new lines of research appear profitable and target specific factors associated with the production of melanin pigments. These include the role of (i) metals, (ii) amino acids, and (iii) testosterone and social interactions in shaping the extent and intensity of melanin-colored plumage patches. Here, I review recent studies of and evidence for these honesty-reinforcing mechanisms.

Original languageEnglish (US)
Pages (from-to)133-138
Number of pages6
JournalPigment Cell and Melanoma Research
Issue number2
StatePublished - Apr 2008


  • Amino acids
  • Barn owl
  • Barn swallow
  • House sparrow
  • Metals
  • Minerals
  • Plumage
  • Testosterone
  • Zebra finch

ASJC Scopus subject areas

  • Biochemistry, Genetics and Molecular Biology(all)
  • Oncology
  • Dermatology


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