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Journal of Comparative Physiology A

, Volume 201, Issue 7, pp 657–666 | Cite as

Unexpected dynamic up-tuning of auditory organs in day-flying moths

  • Emanuel C. MoraEmail author
  • Ariadna Cobo-Cuan
  • Frank Macías-Escrivá
  • Manfred Kössl
Original Paper

Abstract

In certain nocturnal moth species the frequency range of best hearing shifts to higher frequencies during repeated sound stimulation. This could provide the moths with a mechanism to better detect approaching echolocating bats. However, such a dynamic up-tuning would be of little value for day-flying moths that use intra-specific acoustic communication. Here we examined if the ears of day-flying moths provide stable tuning during longer sound stimulation. Contrary to our expectations, dynamic up-tuning was found in the ear of the day-flying species Urania boisduvalii and Empyreuma pugione. Audiograms were measured with distortion-product otoacoustic emissions (DPOAEs). The level of the dominant distortion product (i.e. 2f1–f2) varied as a function of time by as much as 45 dB during ongoing acoustic stimulation, showing a systematic decrease at low frequencies and an increase at high frequencies. As a consequence, within about 2 s of acoustic stimulation, the DPOAEs audiogram shifted from low to high frequencies. Despite the up-tuning, the range of best audition still fell within the frequency band of the species-specific communication signals, suggesting that intra-specific communication should not be affected adversely. Up-tuning could be an ancestral condition in moth ears that in day-flying moths does not underlie larger selection pressure.

Keywords

Audiogram DPOAEs Dynamic tuning Moths 

Abbreviations

DP

Distortion products

DPOAEs

Distortion-product otoacoustic emissions

FFT

Fast Fourier transform

LVD

Laser Doppler vibrometry

SPL

Sound pressure level

Notes

Acknowledgments

We thank students at Havana University for collecting animals in the field. We thank the three anonymous reviewers for their helpful comments. This work was supported by the Institute Partnership Stipendium from the Alexander von Humboldt Foundation to the Research Groups of ECM and MK. Capture, holding and experimental procedures used in this study were approved by the animal care committees of the University of Frankfurt and University of Havana.

Conflict of interest

The authors declare that they have no conflict of interest.

Supplementary material

Supplementary material 1 (MPG 6037 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  • Emanuel C. Mora
    • 1
    Email author
  • Ariadna Cobo-Cuan
    • 1
  • Frank Macías-Escrivá
    • 1
  • Manfred Kössl
    • 2
  1. 1.Research Group in Bioacoustics and Neuroethology, Faculty of BiologyHavana UniversityHavanaCuba
  2. 2.Institut für Zellbiologie und NeurowissenschaftJ.W. Goethe Universität FrankfurtFrankfurt am MainGermany

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