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Electrophysiological Recordings from the Giant Fiber Pathway of D. melanogaster
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Superfast muscles set maximum call rate in echolocating bats.

Coen P H Elemans1, Andrew F Mead, Lasse Jakobsen

  • 1Institute of Biology, University of Southern Denmark, DK-5230 Odense M, Denmark. coen@biology.sdu.dk

Science (New York, N.Y.)
|October 1, 2011
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Summary

Echolocating bats use specialized superfast muscles to produce rapid calls during their terminal buzz for hunting. Laryngeal motor performance, not echo overlap, limits their maximum call rate.

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Area of Science:

  • Bioacoustics
  • Animal Communication
  • Vertebrate Physiology

Background:

  • Echolocating bats emit calls at high rates (>160 calls/sec) during the terminal buzz phase of prey capture.
  • The mechanism enabling these rapid vocalizations has remained largely unknown.
  • Understanding this mechanism is crucial for comprehending bat hunting strategies and sensory biology.

Purpose of the Study:

  • To identify the physiological basis for the high call rates in echolocating bats' terminal buzz.
  • To determine the factors limiting the maximum call rate during echolocation.
  • To investigate the evolutionary pressures driving the development of specialized laryngeal muscles.

Main Methods:

  • Histological analysis of laryngeal muscles in echolocating bats.
  • High-speed videography and acoustic recordings during bat hunting behavior.
  • Electromyography to measure laryngeal muscle activity and nerve stimulation.

Main Results:

  • Discovery of previously unknown, highly specialized superfast muscles in the bat larynx.
  • Demonstration that these superfast muscles are responsible for powering the rapid call rates of the terminal buzz.
  • Evidence that laryngeal motor performance, rather than the overlap of outgoing calls and returning echoes, limits the maximum call rate.

Conclusions:

  • Superfast laryngeal muscles are key to the high-frequency vocalizations enabling bats' effective echolocation.
  • The evolution of these muscles is likely driven by the advantage of rapid auditory feedback for capturing fast-moving prey.
  • This finding highlights the rare occurrence and specific adaptations of superfast muscles in vertebrates for acoustic communication.