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Swarm intelligence: New collective properties of swarm dynamics uncovered

Date:
March 15, 2013
Source:
Springer Science+Business Media
Summary:
A new study of animal swarms uncovers some new features of their collective behavior when overcrowding sets in. Swarming is the spontaneous organized motion of a large number of individuals. It is observed at all scales, from bacterial colonies, slime molds and groups of insects to shoals of fish, flocks of birds and animal herds. Now physicists have uncovered new collective properties of swarm dynamics.

School of sardines.
Credit: © Richard Carey / Fotolia

A new study of animal swarms uncovers some new features of their collective behaviour when overcrowding sets in.

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Swarming is the spontaneous organised motion of a large number of individuals. It is observed at all scales, from bacterial colonies, slime moulds and groups of insects to shoals of fish, flocks of birds and animal herds. Now physicists Maksym Romenskyy and Vladimir Lobaskin from University College Dublin, Ireland, have uncovered new collective properties of swarm dynamics in a study just published in EPJ B. Ultimately, this could be used to control swarms of animals, robots, or human crowds by applying signals capable of emulating the underlying interaction of individuals within the swarm, which could lead to predicted motion patterns elucidated through modelling.

The authors were inspired by condensed matter models, used for example in the study of magnetism, which were subsequently adapted to be biologically relevant to animal swarms. In their model, in addition to the ability to align with its neighbours, each model animal is endowed with two new features: one for collision avoidance and another preventing direction change at every step to ensure persistence of motion. The team performed computer simulations of up to 100,000 self-propelled particles, each mimicking an individual animal and moving at a constant speed on a plane surface.

They found that when the swarm becomes overcrowded, the globally ordered motion breaks down. At high density and when the nearest neighbours are within one step of each other, each animal can no longer decide on the safe direction of motion. Instead, it is busy correcting its motion to avoid collisions.

They also described, for the first time, a power law that quantifies the average degree of alignment in the direction of motion for animals within the swarm. The law describes how the alignment decays from the centre of the swarm, where animals can best judge the swarm motion due to their maximum number of neighbours, to the periphery.


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The above story is based on materials provided by Springer Science+Business Media. Note: Materials may be edited for content and length.


Journal Reference:

  1. Maksym Romenskyy, Vladimir Lobaskin. Statistical properties of swarms of self-propelled particles with repulsions across the order-disorder transition. The European Physical Journal B, 2013; 86 (3) DOI: 10.1140/epjb/e2013-30821-1

Cite This Page:

Springer Science+Business Media. "Swarm intelligence: New collective properties of swarm dynamics uncovered." ScienceDaily. ScienceDaily, 15 March 2013. <www.sciencedaily.com/releases/2013/03/130315095921.htm>.
Springer Science+Business Media. (2013, March 15). Swarm intelligence: New collective properties of swarm dynamics uncovered. ScienceDaily. Retrieved March 5, 2015 from www.sciencedaily.com/releases/2013/03/130315095921.htm
Springer Science+Business Media. "Swarm intelligence: New collective properties of swarm dynamics uncovered." ScienceDaily. www.sciencedaily.com/releases/2013/03/130315095921.htm (accessed March 5, 2015).

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