Beyond the exponential horn: a bush-cricket with ear canals which function as coupled resonators

Emine Celiker (Lead / Corresponding author), Charlie Woodrow, Aurora Y. Rocha-Sánchez, Benedict D. Chivers, Ludivina Barrientos-Lozano, Fernando Montealegre-Z (Lead / Corresponding author)

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Abstract

Bush-crickets have dual-input, tympanal ears located in the tibia of their forelegs. The sound will first of all reach the external sides of the tympana, before arriving at the internal sides through the bush-cricket's ear canal, the acoustic trachea (AT), with a phase lapse and pressure gain. It has been shown that for many bush-crickets, the AT has an exponential horn-shaped morphology and function, producing a significant pressure gain above a certain cut-off frequency. However, the underlying mechanism of different AT designs remains elusive. In this study, we demonstrate that the AT of the duetting Phaneropterinae bush-cricket Pterodichopetala cieloi function as coupled resonators, producing sound pressure gains at the sex-specific conspecific calling song frequency, and attenuating the remainder - a functioning mechanism significantly different from an exponential horn. Furthermore, it is demonstrated that despite the sexual dimorphism between the P. cieloi AT, both male and female AT have a similar biophysical mechanism. The analysis was carried out using an interdisciplinary approach, where micro-computed tomography was used for the morphological properties of the P. cieloi AT, and a finite-element analysis was applied on the precise tracheal geometry to further justify the experimental results and to go beyond experimental limitations.

Original languageEnglish
Article number220532
Number of pages14
JournalRoyal Society Open Science
Volume9
Issue number10
Early online date12 Oct 2022
DOIs
Publication statusPublished - Oct 2022

Keywords

  • acoustic trachea
  • bush-cricket ear
  • finite-element analysis
  • laser Doppler vibrometry

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