Plumage coloration, not length or symmetry of tail-streamers, is a sexually selected trait in North American barn swallows

Rebecca J. Safran, Kevin McGraw

Research output: Contribution to journalArticle

124 Citations (Scopus)

Abstract

Sexual adornments often vary markedly across a species' range, which presumably is owing to differences in local environmental conditions and the associated selection pressures, such as natural versus sexual selection or the relative signaling value of different ornamental traits. However, there are only a few reported examples in which the information content of mating signals varies geographically, and even fewer in which a set of secondary sexual traits serves different signaling functions in different populations. Classic studies of sexual selection in the European barn swallow (Hirundo rustica rustica) demonstrate that elongate tail-streamers provide several reproductive advantages to males and females and are used as reliable signals of mate quality. Here, we show that tail-streamers do not appear to confer these same benefits in a population of barn swallows from North America (Hirundo rustica erythrogaster). Instead, ventral plumage coloration, which is more exaggerated in North American swallows compared with their European counterparts, predicts patterns of assortative mating and annual reproductive success in H. r. erythrogaster. These observations support the idea that ornamental traits can serve different functions among animal populations and suggest that geographic variation in different sexual signals may facilitate population divergence, which may ultimately lead to speciation.

Original languageEnglish (US)
Pages (from-to)455-461
Number of pages7
JournalBehavioral Ecology
Volume15
Issue number3
DOIs
StatePublished - May 2004
Externally publishedYes

Fingerprint

Swallows
Hirundo rustica
plumage
symmetry
Tail
tail
sexual selection
color
Population
assortative mating
geographical variation
ornamental value
reproductive success
North America
divergence
environmental conditions
Pressure
environmental factors
animals

Keywords

  • Geographic variation
  • Hirundo rustica
  • Population divergence
  • Sexual selection
  • Sexual signals

ASJC Scopus subject areas

  • Animal Science and Zoology
  • Ecology
  • Behavioral Neuroscience

Cite this

Plumage coloration, not length or symmetry of tail-streamers, is a sexually selected trait in North American barn swallows. / Safran, Rebecca J.; McGraw, Kevin.

In: Behavioral Ecology, Vol. 15, No. 3, 05.2004, p. 455-461.

Research output: Contribution to journalArticle

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