Path selection and foraging efficiency in Argentine ant transport networks

Simon Garnier, Aurélie Guérécheau, Maud Combe, Vincent Fourcassié, Guy Theraulaz

Research output: Contribution to journalArticlepeer-review

37 Scopus citations


We experimentally investigated both individual and collective behavior of the Argentine ant Linepithema humile as they crossed symmetrical and asymmetrical bifurcations in gallery networks. Ants preferentially followed the branch that deviated the least from their current direction and their probability to perform a U-turn after a bifurcation increased with the turning angle at the bifurcation. At the collective level, colonies were better able to find the shortest path that linked the nest to a food source in a polarized network where bifurcations were symmetrical from one direction and asymmetrical from the other than in a network where all bifurcations were symmetrical. We constructed a model of individual behavior and showed that an individual's preference for the least deviating path will be amplified via the ants' mass recruitment mechanism thus explaining the difference found between polarized and non-polarized networks. The foraging efficiency measured in the simulations was three times higher in polarized than in non-polarized networks after only 15 min. We conclude that measures of transport network efficiency must incorporate both the structural properties of the network and the behavior of the network users.

Original languageEnglish (US)
Pages (from-to)1167-1179
Number of pages13
JournalBehavioral Ecology and Sociobiology
Issue number8
StatePublished - Jun 2009
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Animal Science and Zoology


  • Argentine ant
  • Bifurcation geometry
  • Foraging efficiency
  • Linepithema humile
  • Path selection
  • Transport networks


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