IS THE PREVALENCE OF TAENIA TAENIAEFORMIS IN MICROTUS ARVALIS DEPENDENT ON POPULATION DENSITY? (original) (raw)
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1 December 2003 IS THE PREVALENCE OF TAENIA TAENIAEFORMIS IN MICROTUS ARVALIS DEPENDENT ON POPULATION DENSITY?
Elisabeth Fichet-Calvet,Patrick Giraudoux,Jean-Pierre Quéré,Richard William Ashford,Pierre Delattre
Author Affiliations +
Elisabeth Fichet-Calvet,1 Patrick Giraudoux,1,* Jean-Pierre Quéré,1 Richard William Ashford,1,** Pierre Delattre1
1Centre de Biologie et de Gestion des Populations, Campus de Baillarguet, CS 30016, 34988 Montferrier
** Laboratoire de Biologie Environnementale, EA3184 UsC INRA, Université de Franche-Comté, Place Leclerc, 25030 Besançon CEDEX, France
**† Liverpool School of Tropical Medicine, Pembroke Place, Liverpool L3 5QA, U.K
Abstract
Populations of common voles Microtus arvalis were studied as hosts of the tapeworm Taenia taeniaeformis during a 14-yr survey. They were monitored in spring, summer, and autumn in a pastoral ecosystem in eastern France. A total of 7,574 voles were sampled during 2 multiannual population fluctuations. A third fluctuation was sampled during the increase phase only. Overall prevalence was lowest in summer (0.6%), increased by 3 times in autumn (1.5%) and a further 5 times in spring (7.8%). Analysis of prevalence, based on 7,384 voles, by multiple logistic regression revealed that extrinsic factors such as season and intrinsic factors such as host age and host density have a combined effect. In the longer term, host age and host density were positively associated with prevalence in summer. Host density was strongly associated with autumn prevalence. There was no association between the fluctuation phase and prevalence. The study shows that a long timescale (here a multiannual survey) is necessary to demonstrate the positive effect of host density on the prevalence of this indirectly transmitted parasite. The demonstration of this relationship depends on the rodents being intermediate rather than definitive hosts.
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Elisabeth Fichet-Calvet, Patrick Giraudoux, Jean-Pierre Quéré, Richard William Ashford, and Pierre Delattre "IS THE PREVALENCE OF TAENIA TAENIAEFORMIS IN MICROTUS ARVALIS DEPENDENT ON POPULATION DENSITY?," Journal of Parasitology 89(6), 1147-1152, (1 December 2003). https://doi.org/10.1645/GE-3158
Received: 26 December 2002; Accepted: 1 April 2003; Published: 1 December 2003
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