Abstract
Predator-prey relationships are one of the most studied interactions in population ecology. However, little attention has been paid to the possibility of role exchange between species once determined as predators and preys, despite firm field evidence of such phenomena in the nature. In this paper, we build a model capable of reproducing the main phenomenological features of one reported predator-prey role-reversal system, and present results for both the homogeneous and the space explicit cases. We find that, depending on the choice of parameters, our role-reversal dynamical system exhibits excitable-like behaviour, generating waves of species' concentrations that propagate through space.
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