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Doppler-shift compensation by the mustached bat: quantitative data

A W Keating1, O W Henson, M M Henson

  • 1Department of Cell Biology and Anatomy, University of North Carolina at Chapel Hill 27599.

The Journal of Experimental Biology
|March 1, 1994
PubMed
Summary
This summary is machine-generated.

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Parnell

Area of Science:

  • Bioacoustics
  • Sensory Ecology
  • Neuroethology

Background:

  • Bats use echolocation for navigation and hunting.
  • Doppler shifts in echolocation calls provide information about relative velocity.
  • Pteronotus parnellii parnellii uses a constant frequency (CF) component in its calls.

Purpose of the Study:

  • To investigate Doppler-shift compensation in Pteronotus parnellii parnellii.
  • To quantify the relationship between velocity and frequency compensation.
  • To understand how bats maintain a stable echo frequency.

Main Methods:

  • Bats were propelled at controlled velocities (0.1-5.0 m/s).
  • Doppler shifts in emitted sounds and returning echoes were measured.
  • Changes in the constant-frequency component of bat calls were analyzed.

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Main Results:

  • Bats compensated for Doppler shifts across all tested velocities.
  • Compensation involved lowering the dominant 61 kHz frequency in small steps.
  • Echo (reference) frequency increased with velocity, showing consistent undercompensation (average 15.8%).

Conclusions:

  • Pteronotus parnellii parnellii actively compensates for Doppler shifts during flight.
  • The compensation strategy helps maintain a stable echo frequency for sensory processing.
  • Undercompensation suggests a trade-off between velocity information and other sensory cues.