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Long-term dynamics of natural populations of Schistosoma mansoni among Rattus rattus in patchy environment

Published online by Cambridge University Press:  06 April 2009

A. Théron ,
J. P. Pointier ,
S. Morand ,
D. Imbert-Establet  and
G. Borel
A. Théron
Affiliation:
Laboratoire de Biologie Animale, URA CNRS 698, Centre de Biologie et d'ecologie tropicale et méditerranéenne, Université 52, Av. de Villeneuve, 66860 Perpignan Cedex, France
J. P. Pointier
Affiliation:
Laboratoire de Biologie Marine et Malacologie, Centre de Biologie et d'ecologie tropicale et méditerranéenne, Ecole Pratique des Hautes Etudes, 52, Av. de Villeneuve, 66860 Perpignan Cedex, France
S. Morand
Affiliation:
Laboratoire de Biologie Animale, URA CNRS 698, Centre de Biologie et d'ecologie tropicale et méditerranéenne, Université 52, Av. de Villeneuve, 66860 Perpignan Cedex, France
D. Imbert-Establet
Affiliation:
Laboratoire de Biologie Animale, URA CNRS 698, Centre de Biologie et d'ecologie tropicale et méditerranéenne, Université 52, Av. de Villeneuve, 66860 Perpignan Cedex, France
G. Borel
Affiliation:
Laboratoire de Biologie, Centre Régional Hospitalo-Universitaire de Pointe à Pitre, BP 465, 97159 Pointe à Pitre, Guadeloupe
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Summary

Dynamics of natural populations of Schistosoma mansoni were studied during 8 consecutive years among Rattus rattus populations from 8 transmission sites of the marshy forest focus of Guadeloupe (French West Indies). The schistosome population is over-dispersed (k = 0·119) within the murine hosts and ecological factors linked to the patchy environment may be responsible for such aggregated distribution. Analysis of the spatio-temporal variations in prevalences, intensities and abundances showed limited variations of the infection during the 8 years at the level of the whole parasite population but great spatial heterogeneity at the level of local schistosome populations. Inter-populational genetic variability linked to the degree of adaptation of this human parasite to the murine host may explain differences in transmission dynamics between the local populations of S. mansoni.

Keywords

Schistosoma mansoniRattus rattusworm distributionpopulation dynamicsecology
Type
Research Article
Information
Parasitology , Volume 104 , Issue 2 , April 1992 , pp. 291 - 298
Copyright
Copyright © Cambridge University Press 1992

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