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Updated: Jun 12, 2026

Quantifying Bacterial Surface Swarming Motility on Inducer Gradient Plates

Quantifying Bacterial Surface Swarming Motility on Inducer Gradient Plates

Published on: January 5, 2022

Dynamics of bacterial swarming.

Nicholas C Darnton¹, Linda Turner, Svetlana Rojevsky

¹Rowland Institute at Harvard University, Cambridge, Massachusetts, USA.

Biophysical Journal

|May 21, 2010

Summary

Swarming bacteria like Escherichia coli move in coordinated packs, with individual cell speeds varying widely. Neighbor interactions, not typical run-tumble behavior, guide their collective motion and orientation during swarming.

Area of Science:

Microbiology
Bacterial Motility
Collective Cell Behavior

Background:

Vegetative bacteria exhibit swarming behavior on surfaces, characterized by multinucleation, elongation, and coordinated movement.
Swarming involves complex multicellular coordination, distinct from individual swimming and chemotaxis.

Purpose of the Study:

To analyze the motion dynamics of swarming Escherichia coli.
To compare individual cell movement during swarming versus free swimming.
To investigate the mechanisms underlying coordinated swarming behavior.

Main Methods:

Microscopy to observe individual cell motion.
Analysis of cell speed and orientation correlations.
Comparison of swarming cell behavior to swimming behavior.

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Preparation, Imaging, and Quantification of Bacterial Surface Motility Assays

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Last Updated: Jun 12, 2026

Quantifying Bacterial Surface Swarming Motility on Inducer Gradient Plates

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Published on: January 5, 2022

Time-lapse Imaging of Bacterial Swarms and the Collective Stress Response

Time-lapse Imaging of Bacterial Swarms and the Collective Stress Response

Published on: May 23, 2020

Preparation, Imaging, and Quantification of Bacterial Surface Motility Assays

Preparation, Imaging, and Quantification of Bacterial Surface Motility Assays

Published on: April 7, 2015

Main Results:

Swarming cell speeds are broadly distributed, similar to swimming speeds.
Cell speeds and orientations show short-range, anisotropic correlations.
Normal run-tumble chemotaxis is suppressed; cells are reoriented by neighbor jostling.
Cells at the swarm edge exhibit distinct pausing and directional swimming behaviors.

Conclusions:

Swarming Escherichia coli exhibit complex collective motion driven by cell-cell interactions.
Neighbor jostling and hydrodynamic interactions facilitate local alignment and coordinated movement.
Swarming behavior represents a distinct mode of bacterial collective motility.