Arnaud Lioni

Publications (3)2.81 Total impact

• Source

  Available from: Guy Theraulaz

  Article: Model of droplet dynamics in the Argentine ant Linepithema humile (Mayr)

  Guy Theraulaz, Eric Bonabeau, Christian Sauwens, Jean-Louis Deneubourg, Arnaud Lioni, François Libert, Luc Passera, Ricard Solé
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  ABSTRACT: The formation of droplets of ants Linepithema humile (Mayr) is observed under certain experimental conditions: a fluctuating aggregate forms at the end of a rod and a droplet containing up to 40 ants eventually falls down. When the flux of incoming ants is sufficient, this process can continue for several hours, leading to the formation and fall of tens of droplets. Previous work indicates that the time series of drop-to-drop intervals may result from a nonlinear low-dimensional dynamics, and the interdrop increments exhibit long-range anticorrelations. A model of aggregation and droplet formation, based on experimental observations, is introduced and shown to reproduce these properties.
  Bulletin of Mathematical Biology 04/2012; 63(6):1079-1093. · 1.85 Impact Factor
• Source

  Available from: Guy Theraulaz

  Article: Chain Formation in Œcophylla longinoda

  Arnaud Lioni, Christian Sauwens, Guy Theraulaz, Jean-Louis Deneubourg
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  ABSTRACT: The aggregation phenomenon is very common in numerous activities of social insects, however, it is often their functional aspects that are studied, leaving their mechanisms not so well understood. With the example of chain formation in cophylla longinoda, we present the mechanisms responsible for these collective structures. Our experimental results show that a change in the probability that a worker will decide to join or leave a chain is (1) strongly dependent on the number of ants present in the chain and (2) slightly dependent on the presence of a visual stimulus. The determining role of these probabilities is validated with the use of a mathematical model that reproduces the formation and breakup of the chain. Moreover, it predicts other properties of aggregation such as the influence of nest population size.
  Journal of Insect Behavior 08/2001; 14(5):679-696. · 0.96 Impact Factor
• Article: Dripping faucet with ants

  Eric Bonabeau, Guy Theraulaz, Jean-Louis Deneubourg, Arnaud Lioni, François Libert, Christian Sauwens, Luc Passera
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  ABSTRACT: The formation of droplets of ants is observed under certain experimental conditions. An aggregate forms at the end of a rod, the size of this aggregate fluctuates, and a droplet containing up to 40 ants eventually falls down. When the flux of incoming ants is sufficient, this process can continue for several hours, leading to the formation and fall of tens of droplets. This phenomenon is reminiscent of a leaky faucet, a well-known example of a simple chaotic system. It is found that the similarity is more than apparent: the time series of drop-to-drop intervals appears to result from a nonlinear low-dimensional dynamics, and the interdrop increments exhibit long-range anticorrelations.
  Phys. Rev. E. 57(5).