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SHORT COMMUNICATION
Hearing on the fly: the effects of wing position on noctuid moth hearing
Shira D. Gordon, Elizabeth Klenschi, James F. C. Windmill
Journal of Experimental Biology 2017 220: 1952-1955; doi: 10.1242/jeb.156588
Shira D. Gordon
1Department of Biological Sciences, Dartmouth College, Hanover, NH 03755, USA
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  • ORCID record for Shira D. Gordon
  • For correspondence: shira.gordon@ars.usda.gov
Elizabeth Klenschi
2Centre for Ultrasonic Engineering, Department of Electronic & Electrical Engineering, University of Strathclyde, Glasgow G1 1XW, UK
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James F. C. Windmill
2Centre for Ultrasonic Engineering, Department of Electronic & Electrical Engineering, University of Strathclyde, Glasgow G1 1XW, UK
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ABSTRACT

The ear of the noctuid moth has only two auditory neurons, A1 and A2, which function in detecting predatory bats. However, the noctuid's ears are located on the thorax behind the wings. Therefore, as these moths need to hear during flight, it was hypothesized that wing position may affect their hearing. The wing was fixed in three different positions: up, flat and down. An additional subset of animals was measured with freely moving wings. In order to negate any possible acoustic shadowing or diffractive effects, all wings were snipped, leaving the proximal-most portion and the wing hinge intact. Results revealed that wing position plays a factor in threshold sensitivity of the less sensitive auditory neuron A2, but not in the more sensitive neuron A1. Furthermore, when the wing was set in the down position, fewer A1 action potentials were generated prior to the initiation of A2 activity. Analyzing the motion of the tympanal membrane did not reveal differences in movement due to wing position. Therefore, these neural differences arising from wing position are proposed to be due to other factors within the animal such as different muscle tensions.

FOOTNOTES

  • Competing interests

    The authors declare no competing or financial interests.

  • Author contributions

    Conceptualization: S.D.G., J.F.C.W.; Methodology: S.D.G., J.F.C.W., E.K.; Software: J.F.C.W., E.K.; Validation: J.F.C.W., E.K.; Formal analysis: S.D.G., J.F.C.W., E.K.; Investigation: S.D.G.; Resources: J.F.C.W.; Data curation: J.F.C.W., E.K.; Writing - original draft: S.D.G.; Writing - review & editing: S.D.G., J.F.C.W., E.K.; Visualization: S.D.G.; Supervision: J.F.W.; Project administration: J.F.W.; Funding acquisition: S.D.G.

  • Funding

    This project was supported by a Company of Biologists travelling fellowship (JEBTF-140807) to S.D.G. In addition, funds were supplied from Hannah ter Hofstede's laboratory funds. Finally, research at the University of Strathclyde leading to these results received funding from the European Research Council under the European Union's Seventh Framework Programme (FP/2007-2013/ERC Grant Agreement n. 615030).

  • Data availability

    All data created during this research are openly available from the University of Strathclyde Pure/KnowledgeBase at http://dx.doi.org/10.15129/1af642b7-f467-46d8-a43f-2259472a0286.

  • Supplementary information

    Supplementary information available online at http://jeb.biologists.org/lookup/doi/10.1242/jeb.156588.supplemental

  • Received January 17, 2017.
  • Accepted March 21, 2017.
  • © 2017. Published by The Company of Biologists Ltd
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Keywords

  • Neurophysiology
  • Tympanum
  • Biomechanics
  • Insect
  • Flight
  • Bat defense
  • Heliothis virescens

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SHORT COMMUNICATION
Hearing on the fly: the effects of wing position on noctuid moth hearing
Shira D. Gordon, Elizabeth Klenschi, James F. C. Windmill
Journal of Experimental Biology 2017 220: 1952-1955; doi: 10.1242/jeb.156588
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SHORT COMMUNICATION
Hearing on the fly: the effects of wing position on noctuid moth hearing
Shira D. Gordon, Elizabeth Klenschi, James F. C. Windmill
Journal of Experimental Biology 2017 220: 1952-1955; doi: 10.1242/jeb.156588

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