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Transfer Entropy Analysis of Interactions between Bats Using Position and Echolocation Data.

Irena Shaffer1, Nicole Abaid2

  • 1Engineering Mechanics Program, Virginia Tech, Blacksburg, VA 24061, USA.

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|December 8, 2020
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Summary
This summary is machine-generated.

Bats use echolocation for navigation, risking signal interference in groups. This study reveals information transfer between bats flying together, suggesting leader-follower dynamics in their collective behavior.

Keywords:
3D trackinganimal group interactionbat swarmsmicrophone arraystransfer entropy

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Area of Science:

  • Animal behavior
  • Bioacoustics
  • Neuroethology

Background:

  • Many animal species exhibit collective behavior, with bats uniquely using echolocation for navigation.
  • Group echolocation poses risks of signal interference, prompting evolved strategies in bats.
  • Previous studies analyzed bat movement or echolocation separately, not their interaction.

Purpose of the Study:

  • To investigate the role of acoustic sensing in the coordinated flight of bat pairs.
  • To quantify the interaction between bats using information theory and echolocation data.
  • To determine if echolocation influences bat pair flight dynamics.

Main Methods:

  • Collected field data from gray bats (Myotis grisescens) using cameras and microphones.
  • Applied transfer entropy, an information-theoretic measure, to analyze bat interactions.
  • Analyzed time series data of bat speed and turning behavior in conjunction with echolocation.

Main Results:

  • Evidence of information transfer between bats flying in pairs was found.
  • Unidirectional information transfer was observed in certain data subsets.
  • This suggests potential leader-follower interactions influencing coordinated flight.

Conclusions:

  • Acoustic sensing plays a significant role in bat pair coordination.
  • Information transfer dynamics, potentially mediated by echolocation, shape collective bat flight.
  • Findings support the existence of leader-follower interactions in bat pairs.