Abstract
1. Spatial heterogeneity has long been recognized as a potentially powerful stabilizing force in host-parasitoid interactions. Most previous work has emphasized heterogeneity in the rate of attacks experienced by individual hosts. In contrast, we highlight the potential importance of spatial heterogeneity in demographic parameters other than the rate of parasitism. 2. Following the model structure explored by Hassell & May (1973) in which hosts and parasitoids are distributed across patches according to fixed distribution rules, we show that, in the absence of heterogeneity in the rate of parasitism, spatial variability in other demographic parameters has no effect on population stability
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