title: Discovery-dominance trade-off among widespread invasive ant species.
abstract: Ants are among the most problematic invasive species. They displace numerous native species, alter ecosystem processes, and can have negative impacts on agriculture and human health. In part, their success might stem from a departure from the discovery-dominance trade-off that can promote co-existence in native ant communities, that is, invasive ants are thought to be at the same time behaviorally dominant and faster discoverers of resources, compared to native species. However, it has not yet been tested whether similar asymmetries in behavioral dominance, exploration, and recruitment abilities also exist among invasive species. Here, we establish a dominance hierarchy among four of the most problematic invasive ants (Linepithema humile, Lasius neglectus, Wasmannia auropunctata, Pheidole megacephala) that may be able to arrive and establish in the same areas in the future. To assess behavioral dominance, we used confrontation experiments, testing the aggressiveness in individual and group interactions between all species pairs. In addition, to compare discovery efficiency, we tested the species' capacity to locate a food resource in a maze, and the capacity to recruit nestmates to exploit a food resource. The four species differed greatly in their capacity to discover resources and to recruit nestmates and to dominate the other species. Our results are consistent with a discovery-dominance trade-off. The species that showed the highest level of interspecific aggressiveness and dominance during dyadic interactions.
authors.affiliation: Ecologie, Systématique & Evolution, UMR CNRS 8079, Univ. Paris Sud Orsay Cedex 91405, France.
authors.forename: Cleo
authors.initials: C
authors.lastname: Bertelsmeier
authors.affiliation: Ecologie, Systématique & Evolution, UMR CNRS 8079, Univ. Paris Sud Orsay Cedex 91405, France ; Department of Ecology and Evolution, Biophore, UNIL-Sorge, University of Lausanne 1015, Lausanne, Switzerland.
authors.forename: Amaury
authors.initials: A
authors.lastname: Avril
authors.affiliation: Estación Biológica de Doñana, Consejo Superior de Investigaciones Científicas 41092, Sevilla, Spain.
authors.forename: Olivier
authors.initials: O
authors.lastname: Blight
authors.affiliation: Institut Méditerranéen de Biodiversité et d'Écologie marine et continentale (IMBE), Aix-Marseille Université, UMR CNRS IRD Avignon Université, UMR 237 IRD, Centre IRD Nouméa BP A5, 98848, Nouméa Cedex, New Caledonia.
authors.forename: Hervé
authors.initials: H
authors.lastname: Jourdan
authors.affiliation: Ecologie, Systématique & Evolution, UMR CNRS 8079, Univ. Paris Sud Orsay Cedex 91405, France.
authors.forename: Franck
authors.initials: F
authors.lastname: Courchamp
keywords: Behavioral dominance; biological invasions; discovery–dominance trade-off; exploitation; exploration; invasive ants