The Science of Nature

, 104:44

Sexual selection on receptor organ traits: younger females attract males with longer antennae

  • Tamara L. Johnson
  • Matthew R. E. Symonds
  • Mark A. Elgar
Original Paper

Abstract

Sexual selection theory predicts that female choice may favour the evolution of elaborate male signals. Darwin also suggested that sexual selection can favour elaborate receiver structures in order to better detect sexual signals, an idea that has been largely ignored. We evaluated this unorthodox perspective by documenting the antennal lengths of male Uraba lugens Walker (Lepidoptera: Nolidae) moths that were attracted to experimentally manipulated emissions of female sex pheromone. Either one or two females were placed in field traps for the duration of their adult lives in order to create differences in the quantity of pheromone emissions from the traps. The mean antennal length of males attracted to field traps baited with a single female was longer than that of males attracted to traps baited with two females, a pattern consistent with Darwin’s prediction assuming the latter emits higher pheromone concentrations. Furthermore, younger females attracted males with longer antennae, which may reflect age-specific changes in pheromone emission. These field experiments provide the first direct evidence of an unappreciated role for sexual selection in the evolution of sexual dimorphism in moth antennae and raise the intriguing possibility that females select males with longer antennae through strategic emission of pheromones.

Keywords

Sexual selection Sex pheromones Antenna morphology Mate choice Chemical signals 

Supplementary material

114_2017_1466_MOESM1_ESM.pdf (38 kb)
ESM 1(PDF 38 kb)

Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.School of BiosciencesUniversity of MelbourneMelbourneAustralia
  2. 2.Centre for Integrative Ecology, School of Life and Environmental SciencesDeakin UniversityBurwoodAustralia

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