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Tissue Collection of Bats for -Omics Analyses and Primary Cell Culture
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How the bat got its buzz.

John M Ratcliffe1, Coen P H Elemans, Lasse Jakobsen

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Biology Letters
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Bats use a rapid

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Area of Science:

  • Bioacoustics
  • Animal Behavior
  • Evolutionary Biology

Background:

  • The 'terminal buzz' in bat echolocation, characterized by rapid vocalizations (up to 220 Hz), is crucial for hunting success.
  • This extreme vocalization rate is enabled by superfast muscles, a novel finding in mammals.
  • A second phase, 'buzz II', involves a drop in fundamental frequency (F0).

Purpose of the Study:

  • To investigate the function and evolutionary significance of the bat's terminal buzz, particularly buzz II.
  • To explore the biomechanical and evolutionary implications of rapid vocalizations and frequency modulation in bat hunting.
  • To understand the role of buzz II in predator-prey dynamics between bats and insects.

Main Methods:

  • Analysis of bat vocalizations during insect capture, focusing on the terminal buzz and buzz II.
  • Biomechanical considerations of superfast muscles and laryngeal mechanisms for extreme vocalization rates.
  • Evolutionary analysis of bat echolocation adaptations in response to insect countermeasures.

Main Results:

  • The terminal buzz significantly increases information update rates, enhancing hunting success.
  • Superfast muscles are identified as the mechanism for high-frequency vocalizations.
  • Buzz II broadens the acoustic field of view, potentially reducing insect escape likelihood.

Conclusions:

  • The terminal buzz is a critical adaptation for nocturnal insect capture.
  • Buzz II suggests novel laryngeal mechanisms are required to manage muscle tension and modulate frequency.
  • Buzz II may be an evolutionary countermeasure against insect auditory defenses in an ongoing arms race.