Data and computer code for Vandermeer and Perfecto, Keystone predator and keystone intransitivity: The potential chaos of competitive coexistence. PNAS

Article presents a toy model of a system of four competitors and a predator arranged in a coupled oscillatory fashion -- three species as an intransitive loop and two species in a predator prey relationship. Based on a real system of ants in a coffee agroecosystem in Puerto Rico.