ScienceDirect.com - Acta Oecologica Champlain Djiéto-Lordon, Alain Dejean, Marc Gibernau, Martine Hossaert-McKey, Doyle McKey: Symbiotic mutualism with a community of opportunistic ants: protection, competition, and ant occupancy of the myrmecophyte Barteria nigritana (Passifloraceae)