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Ant waves-Spontaneous activity waves in fire-ant columns.

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Fire ant columns exhibit unique solitary waves driven by ant activity, density, and alignment. These nonlinear waves are constrained by ant activation times and gravity, offering insights into collective behaviors.

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Area of Science:

  • Collective behavior in active matter systems.
  • Nonlinear dynamics and wave propagation.
  • Insect collective intelligence and swarm behavior.

Background:

  • Active matter systems, like organism crowds, consist of energy-dissipating units.
  • Interactions between density and alignment in active matter can generate wave propagation.
  • Fire ants (Solenopsis invicta) form dense columns and exhibit complex collective behaviors.

Purpose of the Study:

  • To investigate the characteristics of solitary waves in dense, two-dimensional fire ant columns.
  • To understand the roles of local activity, density, and alignment in wave formation and propagation.
  • To explore the potential of switchable activity as a framework for understanding collective wave phenomena.

Main Methods:

  • Observational analysis of fire ant (Solenopsis invicta) columns in two-dimensional settings.
  • Examination of the interplay between ant density, alignment, and individual activity.
  • Modeling of nonlinear wave dynamics within the ant columns.

Main Results:

  • Identified nonlinear solitary waves in dense fire ant columns.
  • Demonstrated that wave propagation is constrained by the time for disordered ants to activate and align.
  • Showed that gravity enforces a density minimum at the bottom of the wave structure.
  • Confirmed the critical roles of local activity, density, and alignment in wave dynamics.

Conclusions:

  • Intrinsically switchable activity is a key factor in understanding and potentially triggering collective wave behaviors.
  • The study provides a framework for analyzing nonlinear wave phenomena in biological systems.
  • Findings can inform the study of other collective behaviors, such as stampedes in crowds and herds.