Cicada ear geometry: species and sex effects

Jerome Sueur, Solene Janique, Caroline Simonis, James Windmill, Michel Baylac

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Many insect species rely on their sense of audition to find a mate, to localize prey or to escape from a predator. Cicadas are particularly known for their loud call and the conspicuous tympanal hearing system located in their abdomen. The vibration pattern of the tympanal membrane (TM) has been investigated recently revealing mechanical properties specific to species and sex. Although TM size and shape is likely to affect these patterns, the geometry of the cicada ear has never been examined per se. Focusing on three Mediterranean cicada species,
namely Cicadatra atra, Cicada orni and Lyristes plebejus, we investigated the structure of TM shape variation at two levels, within and across species. Applying an elliptic Fourier analysis to the outlines of both male and female TMs, we estimated sexual dimorphism and species effects. Cicadatra atra showed a large TM compared with its small size, probably as a result of selective constraints related to the role of the TM in sound production. Sexual dimorphism seemed to be greater than interspecific variation, indicating that constraints operating on sex might be more selective than those acting on species identification. In addition, C. orni appeared to be significantly different from the two other species. This morphological peculiarity could be related to the unique vibrational
pattern of its membrane. This would establish for the first time a direct link between the shape and mechanism of a hearing organ.
Original languageEnglish
Pages (from-to)922-934
Number of pages13
JournalBiological Journal of the Linnean Society
Volume101
Issue number4
Early online date21 Oct 2010
DOIs
Publication statusPublished - 1 Dec 2010

Keywords

  • audition
  • cicada
  • elliptical Fourier analysis
  • geometric morphometrics
  • tympanum

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