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  • Quantifying Variability of Avian Colours: Are Signalling Traits More Variable? 

    Delhey, Kaspar; Peters, Anne; Tregenza, Tom (Public Library of Science, 2008-02-27)
    Background Increased variability in sexually selected ornaments, a key assumption of evolutionary theory, is thought to be maintained through condition-dependence. Condition-dependent handicap models of sexual selection ...