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Echo feedback mediates noise-induced vocal modifications in flying bats.

Jinhong Luo1, Manman Lu2, Jie Luo2

  • 1Institute of Evolution and Ecology, School of Life Sciences, Central China Normal University, Wuhan, 430079, China. jluo@ccnu.edu.cn.

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Summary

Bats adjust echolocation calls to reduce noise interference, relying on echo feedback, not vocal feedback, for adjustments. This differs from non-echolocating animals

Keywords:
Audio-vocal integrationEcho level compensationEnvironmental noiseLombard effectVocal feedback

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Area of Science:

  • Bioacoustics
  • Animal Communication
  • Behavioral Ecology

Background:

  • Animals modify vocalizations to overcome environmental noise.
  • Echolocating bats must navigate and forage amidst interfering sounds.
  • The role of noise-induced vocal modifications (NIVMs) in echolocation remains unclear.

Purpose of the Study:

  • To investigate whether NIVMs in echolocating bats mitigate interference effects on echoes or calls.
  • To determine the feedback mechanisms (echo vs. vocal) driving vocal adjustments in noise.

Main Methods:

  • Recorded echolocation calls of Hipposideros pratti using a microphone array.
  • Trained bats to approach a landing perch under quiet and noise conditions.
  • Analyzed call parameters (amplitude, duration, bandwidth) and echo level compensation behavior.

Main Results:

  • Hipposideros pratti showed echo level compensation dependent on perch distance.
  • Broadcast noise delayed and altered the rate of echo level compensation.
  • Bats increased call amplitude (Lombard effect) and adjusted call duration and bandwidth with noise.
  • Quantitative analysis indicated reliance on echo feedback, not vocal feedback, for adjustments.

Conclusions:

  • Echolocating bats utilize echo feedback to adjust signals in noisy environments.
  • NIVMs in echolocating bats operate via different mechanisms than in non-echolocating animals.
  • Findings highlight distinct adaptive strategies for vocal communication in noise.