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Seasonal variation in the population dynamics of Caryophyllaeus laticeps

Published online by Cambridge University Press:  06 April 2009

R. M. Anderson
Affiliation:
Department of Biomathematics, University of Oxford, Oxford 0X1 2JZ

Summary

The biological parameters which generate seasonal fluctuations in the size of populations of Caryophyllaeus laticeps are examined in detail. A mathematical model is formulated to describe the dynamics of the adult parasite within the fish host Abramis brama, and the predictions of the model are compared with observed population data.

The seasonality of parasite population size is shown to be caused by the combined effects of a temperature dependent mortality rate and fluctuations in host feeding activity, which controls the immigration rate of larval parasites. The observed overdispersed distribution of adult parasite numbers within the host population is shown to be generated by variability in feeding habits between individual members of the fish population.

The theoretical population model is used as a framework for the investigation of, among other factors, the comparative influences of the immigration and death rates on the dynamics of the adult parasite, the future behaviour of the system under altered environmental conditions and the importance of chance effects in the dynamics of individual parasite populations within a single host.

The stability of the dynamics of the complete life-cycle of C. laticeps is discussed in relation to the inherent biological complexity of host/helminth parasite interactions.

Type
Research Article
Copyright
Copyright © Cambridge University Press 1976

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