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Flutter sensitivity in FM bats. Part II: amplitude modulation.

A Leonie Baier1,2, Kristin-Jasmin Stelzer3, Lutz Wiegrebe3

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Summary
This summary is machine-generated.

Frequency-modulating (FM) bats can detect target movement by sensing echo amplitude modulations, even with short calls. Their performance improves with faster modulation rates, mimicking insect wing-beats.

Keywords:
BiosonarEcholocationSAMVirtual targetWagon-wheel effect

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Area of Science:

  • Bioacoustics
  • Animal Behavior
  • Sensory Ecology

Background:

  • Bats utilize echolocation for navigation and foraging, with frequency-modulating (FM) bats being the most common group.
  • FM bat echolocation calls offer high spatial resolution due to broad bandwidth but struggle with detecting target movement because of short call durations and low duty cycles.
  • Despite these limitations, FM bats successfully hunt in environments with numerous moving targets.

Purpose of the Study:

  • To investigate the capability of FM bats to detect target movement through echo amplitude modulations.
  • To determine if FM bats can overcome the trade-off between spatial and temporal acuity in echolocation.

Main Methods:

  • An auditory virtual reality system was employed to simulate echo amplitude changes caused by fluttering insect wings.
  • The study focused on the FM bat species Phyllostomus discolor.
  • The bats' detection performance was assessed based on varying rates of echo amplitude modulation.

Main Results:

  • Phyllostomus discolor demonstrated the ability to detect amplitude modulations in echoes.
  • Detection performance increased proportionally with the rate of amplitude modulation, simulating faster wing-beats.
  • This suggests FM bats can perceive temporal information crucial for tracking moving targets.

Conclusions:

  • FM bats possess a mechanism to detect target movement via echo amplitude modulations, mitigating limitations of their echolocation call structure.
  • This finding challenges the presumed trade-off between spatial and temporal acuity in FM bat echolocation.
  • The study underscores the adaptability of bat echolocation systems to diverse ecological challenges, such as foraging on moving prey.