Optimal egg distribution among host patches for parasitoids subject to attack by hyperparasitoids

Article Abstract:

The relationship between the oviposition strategy of a parasitoid whose offspring is susceptible to attack by a hyperparasitoid and hyperparasitoid behavior was investigated. The study used a host-parasitoid-hyperparasitoid model comprised of the cabbage aphid Brevicoryne brassicae, its parasite wasp Diaeretiella rapae and the D. rapae hyperparasitoid Alloxysta victrix. The results showed that the optimal number of parasitoid eggs infecting the aphid hosts decreases with a decrease in host colony size and with a decrease in the travel time between aphid colonies. It also decreases with an increase in frequency of hyperparasitoid visits.

Environmental aspects, Wasps, Aphididae, Aphids

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Disease and community structure: the importance of host self-regulation in a host-host-pathogen model

Article Abstract:

Host-host-pathogen dynamics and the role of pathogens in community structure were studied using a model in which two host populations are subject to self-regulation and share the same directly transmitted pathogen. The model assumes that the hosts exhibit continuous population growth, self-regulation or intraspecific competition and settling at carrying capacity in the absence of disease. Several outcomes of the competitive interactions between the two hosts in combination with the regulatory effects of the pathogen are discussed.

Competition (Biology)

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Host-pathogen cycles in self-regulated forest insect systems: resolving conflicting predictions

Article Abstract:

A predictive model on insect host pathogen systems suggest that periodic shifts observed in empirical studies of these systems result exclusively from actions between host pathogens. Two recent studies have adapted this model, but have further included the factor of host self-regulation. While their results are in conflict with each other, an examination of their parameters shows that the variances can be resolved.

Insect pests, Insect carriers of disease, Insects as carriers of disease

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