A model in which two parasitoids compete for the same host species is presented. The model is used to determine whether it is preferable to introduce a single parasitoid species or many. We examine consequences of parasitoid egg and search limitations and interactions between parasitoids on the potential suppression of host densities. The model is then modified to allow explicit niche separation of parasitoids. As the niches separate, even highly antagonistic effects such as hyperparasitism do not negate the benefits of multiple introduction. The degree of niche separation required depends on the intensity of antagonistic behavior between the competing parasitoid species, the ability of each parasitoid to locate and parasitize hosts, and on the size of the host refuge from parasitism.
Keywords: model, multiple introduction
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