Facultative pheromonal mimicry in snakes

"she-males" attract courtship only when it is useful

R. Shine*, T. Langkilde, R. T. Mason

*Corresponding author for this work

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Males of many animal species mimic females, and thereby deceive rival males. Facultative shifts in posture, color, or movement allow a male using visually-based mimicry to adopt and terminate mimicry rapidly. Pheromonal mimicry is rare in vertebrates perhaps because it is difficult to redeploy pheromones rapidly enough to adjust male tactics to local conditions. In Manitoba garter snakes (Thamnophis sirtalis parietalis), female mimicry benefits males immediately after they have emerged from hibernation. While the snakes are cold and slow, courtship warms them and protects them against predatory crows. This benefit disappears as soon as the snakes are warm. We show that (unlike females) she-male garter snakes attract courting males only when they are cold. Low temperatures may suppress volatility of "less attractive" components of the pheromones (saturated methyl ketones) that she-males use to attract courtship, allowing male snakes to function as transvestites only when this tactic is beneficial.

Original languageEnglish
Pages (from-to)691-695
Number of pages5
JournalBehavioral Ecology and Sociobiology
Volume66
Issue number5
DOIs
Publication statusPublished - May 2012
Externally publishedYes

Keywords

  • chemical communication
  • reproductive tactics
  • reptile sociality
  • sexual mimicry

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