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Related Experiment Video

Updated: Sep 11, 2025

Evaluation of the Productivity of Social Wasp Colonies Vespinae and an Introduction to the Traditional Japanese Vespula Wasp Hunting Technique

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Published on: September 11, 2019

Superefficient teamwork in weaver ants.

Madelyne Stewardson¹, Daniele Carlesso², David Labonte³

¹School of Natural Sciences, Macquarie University, Sydney, NSW 2109, Australia.

Current Biology : CB

|August 13, 2025

Summary

This summary is machine-generated.

Weaver ant teams defy the Ringelmann effect, showing increased individual effort with larger group sizes. These superefficient teams utilize a unique division of labor for enhanced collective performance.

Keywords:

Oecophylla smaragdina Ringelmann effect aggregation collective behavior complex systems emergence pulling chains self-assembly self-organization

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Area of Science:

Animal behavior
Collective action
Bio-inspired robotics

Background:

Teamwork is generally expected to improve group performance, especially in physical tasks.
The Ringelmann effect describes a decrease in individual effort as team size increases, attributed to coordination issues or motivation loss.
Weaver ants (Oecophylla smaragdina) exhibit remarkable teamwork, forming pulling teams for nest construction.

Purpose of the Study:

To investigate whether weaver ant pulling teams exhibit the Ringelmann effect.
To quantify the force produced by weaver ant teams of varying sizes during nest construction.

Main Methods:

Experimental measurement of pulling force exerted by weaver ant teams.
Varying team sizes to assess the relationship between group size and individual contribution.
Analysis of force generation mechanisms within ant teams.

Main Results:

Weaver ant teams do not exhibit the Ringelmann effect; individual force contribution nearly doubled with increased team size.
Ants achieve 'superefficiency,' performing better in larger teams.
A division of labor was observed, with 'active pullers' and 'passive resisters' forming a 'force ratchet' mechanism.

Conclusions:

Weaver ants demonstrate a novel, highly coordinated teamwork mechanism that enhances collective force output.
This 'force ratchet' system, leveraging specialized roles and attachment strength, provides a model for superefficient collective action.
Findings may inform the design of optimization algorithms for distributed artificial systems, such as swarm robotics.