Continuous-time models of host-parasitoid interactions

Article Abstract:

Three continuous-time models of host-parasitoid interactions in which hosts and parasitoids have overlapping generations are presented. Two models follow birth, death and dispersal within patches, such that the population dynamics can be explained in terms of asynchrony in the fluctuations of the populations in each patch. The third model considers instantaneous distributions of hosts and parasitoids among patches, and population dynamics can be explained in terms of the variability in the chance that a host will be parasitized. Spatial heterogeneity and parasitoid aggregation affect population dynamics differently in each model.

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Density-dependent and density-independent parasitoid aggregation in model host-parasitoid systems

Article Abstract:

The results of density-dependent and density-independent parasitoid aggregation on population densities and dynamics was studied using a model for host-parasitoid interactions with discrete generations. Density-independent parasitoid aggregation was found to lower parasitism rates and stabilize population dynamics. Density-dependent parasitoid aggregation affected stability as a functional response of parasitoids to host density in patches.

Parasitological research

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Inferring host-parasitoid stability from patterns of parasitism among patches

Article Abstract:

A model is presented for extrapolating relationship stability among parasites and their hosts from individual pockets of occurrence. Steps include designating average parasitoid densities and number of parasites per patch host.

United States, Statistical Data Included, Research, Parasitism

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