Species divergence in sexually selected traits: Increase in song elaboration is related to decrease in plumage ornamentation in finches

Alexander V. Badyaev, Geoffrey E. Hill, Byron V. Weckworth

Research output: Contribution to journalArticle

87 Scopus citations

Abstract

Elaborate plumage and complex songs of male birds are two of the best-known examples of sexually selected traits, yet the interaction between these traits is poorly understood. Theory suggests that among a suite of potential displays, animals will emphasize traits that are most conspicuous, least costly, or best signal condition and reduce display of other traits. Here we examined the relationship between song and plumage elaborations in cardueline finches, songbirds that are highly variable in plumage displays and songs, but that share a similar mating system. We statistically controlled for body mass, habitat characteristics, and phylogenetic relationships and found that across species song complexity was strongly negatively related to elaboration of plumage ornamentation. When plumage coloration was partitioned into carotenoid-based and melanin-based components, song complexity was negatively related to elaboration of male carotenoid-based coloration but unrelated to elaboration of melanin-based coloration. These observations support the idea that, for condition-dependent traits, animal species trade off trait expression in response to changes in the costs or the information content of these traits. We discuss several alternative explanations for the observed pattern.

Original languageEnglish (US)
Pages (from-to)412-419
Number of pages8
JournalEvolution
Volume56
Issue number2
DOIs
StatePublished - Jan 1 2002
Externally publishedYes

Keywords

  • Carduelinae
  • Multiple sexual signals
  • Plumage ornamentation
  • Song elaboration

ASJC Scopus subject areas

  • Ecology, Evolution, Behavior and Systematics
  • Genetics
  • Agricultural and Biological Sciences(all)

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