Abstract
A model of predator-mediated prey coexistence is presented in which the predator is an optimal forager and the superior competitor is also a more desirable prey. A stable three-species is possible if the profitability of the poorer competitor is below the intake requirement of the predator. In general, the determinants of will define this equilibrium diet. If a positive three-species is locally unstable, the system may persist globally due to the addition of the less preferred prey to the diet of the predator during periods of predator starvation. In intrinsically unstable systems optimal foraging may increase stability by shifting losses from decreasing populations to those that are increasing.
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