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Velocity correlations in jackdaw flocks in different ecological contexts.

Daniel O'Coin1, Guillam E Mclvor2, Alex Thornton2

  • 1Department of Mechanical Engineering, University of Massachusetts Dartmouth, North Dartmouth, MA, United States of America.

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Animal group motion shows consistent velocity correlations across different contexts. Jackdaw flocks maintain scale-free correlations, demonstrating coherent responses regardless of environmental conditions or flocking behavior.

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Area of Science:

  • Animal behavior
  • Collective motion
  • Ecology

Background:

  • Velocity correlation is key to understanding collective animal movement.
  • Previous research primarily examined single ecological contexts.
  • The influence of context on correlation characteristics within a species remained unclear.

Purpose of the Study:

  • To investigate velocity correlations in jackdaw flocks across two distinct contexts: transit and mobbing.
  • To determine if correlation characteristics differ between these contexts.
  • To explore the relationship between correlation length, group size, density, and polarization.

Main Methods:

  • Analysis of velocity correlations in jackdaw flocks during transit and mobbing behaviors.
  • Quantification of correlation length in relation to group size and density.
  • Assessment of the impact of group polarization on correlation length.

Main Results:

  • Velocity correlations in both transit and mobbing flocks are scale-free, with correlation length increasing linearly with group size.
  • Correlation length was independent of group density in transit flocks but increased with density in mobbing flocks.
  • Group polarization did not significantly impact correlation length in either context.

Conclusions:

  • Jackdaw flocks exhibit scale-free velocity correlations irrespective of context.
  • Birds adjust their interaction rules (topological vs. metric) based on context.
  • Wild animals demonstrate a consistent ability to respond coherently to environmental perturbations.