Velocity correlations in jackdaw flocks in different ecological contexts.

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.