Melanins, metals, and mate quality

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

Many animals display large patches of black or brown color in their integument, which contain melanin pigments and function as important sexually selected indicators of mate quality. To date, however, the particular means by which melanin-based color ornaments are costly to produce and serve as honest advertisements have remained elusive. Here, I propose a novel biochemical mechanism by which melanin-based coloration may serve as a reliable indicator of quality, involving the interplay of metal ions. In animals and other biochemical systems, a series of scarce macro- and microminerals (e.g. Ca, Zn, Cu, Fe) obtained from the diet act as critical regulatory factors in the biosynthesis of eumelanin and phacomelanin pigments, but can also be toxic to the body when accumulated in high concentrations. As large polymers with many functional (carboxyl) groups, melanin granules also bind these metals and store them in pigmented cells. Thus, by sequestering large deposits of melanin, often in dead tissue (as in hair or feathers), animals may directly reveal dietary access to these rare elements and the physiological protection they have afforded themselves from initially beneficial, but eventually damaging, high mineral concentrations.

Original languageEnglish (US)
Pages (from-to)402-406
Number of pages5
JournalOikos
Volume102
Issue number2
DOIs
StatePublished - Aug 1 2003
Externally publishedYes

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melanin
metals
metal
pigment
color
animal
pigments
eumelanin
animals
biochemical mechanisms
feather
metal ions
integument
hair
feathers
functional group
hairs
mineral content
granules
polymers

ASJC Scopus subject areas

  • Ecology

Cite this

Melanins, metals, and mate quality. / McGraw, Kevin.

In: Oikos, Vol. 102, No. 2, 01.08.2003, p. 402-406.

Research output: Contribution to journalArticle

McGraw, Kevin. / Melanins, metals, and mate quality. In: Oikos. 2003 ; Vol. 102, No. 2. pp. 402-406.
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