The dynamics of insect-pathogen interactions in stage-structured populations

Article Abstract:

The influence of age and stage structure in insect-pathogen models was analyzed to determine the susceptibility of insects to a particular pathogen. The models developed can be of value for population dynamics. The study revealed that long-term Lotka-Volterra cycles are created less readily by age-structured models. Host-pathogen interactions are likely to happen if the adult is long-lived and the juvenile stage is particularly susceptible. The study further revealed the possibility of predicting generation cycles.

Diseases, Insects, Pathogenic microorganisms

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Aggregation and the population dynamics of parasitoids and predators

Article Abstract:

The model-derived prediction that parasitoid/prey aggregation regardless of host/prey density does not destabilize host/prey populations, whereas aggregation on host/prey with high density destabilizes host/prey populations, was examined. It was suggested that the prediction be treated with caution because it is unclear which concept of aggregation was referred to - behavioral or statistical. Fruthermore, the model predictions were not robust when its underlying assumptions, which seem unrealistic, are relaxed.

Predation (Biology)

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Does host self-regulation increase the likelihood of insect-pathogen population cycles?

Article Abstract:

The Anderson and May (1980, 1981) model of insect-pathogen population cycles was extended by more closely describing the natural history of the system. This framework aims to determine if the introduction of host density dependences has an impact on the probability of limit cycle population dynamics. Density-dependent self-regulation was modeled by adding an instantaneous per capita risk of mortality that is proportional to the host population density. Findings and implications are discussed.

Population density, Insect carriers of disease, Insects as carriers of disease

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