Mechanical spectroscopy of insect swarms

Area of Science:

• Collective behavior in social animals
• Emergent properties in biological systems
• Continuum mechanics applied to animal groups

Background:

• Social animals form groups exhibiting emergent, collective behavior.
• Animal groups are hypothesized to have properties distinct from individuals, similar to bulk materials.
• Probing animal groups with controlled perturbations is challenging, especially in natural settings.

Purpose of the Study:

• To investigate emergent continuum mechanical properties in laboratory midge swarms.
• To characterize the collective viscoelastic response of midge swarms to external stimuli.
• To understand the functional role of collective behavior in midge swarms.

Main Methods:

• Laboratory-based experiments on midge swarms.
• Application of controlled oscillatory visual stimuli.
• Measurement of swarm response to extract storage and loss moduli.

Main Results:

• Midge swarms demonstrate emergent continuum mechanical properties.
• Swarm response to stimuli is characterized by collective viscoelasticity.
• Swarm exhibits strong viscous and inertial damping of perturbations.

Conclusions:

• Midge swarms utilize collective behavior for self-stabilization against environmental perturbations.
• Unlike bird flocks that facilitate information flow, midge swarms prioritize stability.
• The study provides a mechanical framework for understanding collective behavior in insect swarms.