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Competitive exclusion in human schistosomes: the restricted distribution of Schistosoma intercalatum

Published online by Cambridge University Press:  06 April 2009

L. A. Tchuem Tchuenté ,
S. Morand ,
D. Imbert-Establet ,
B. Delay  and
J. Jourdane
L. A. Tchuem Tchuenté
Affiliation:
Laboratoire de Biologie Animate (URA CNRS 698), Centre de Biologie et d'Ecologie Tropicale et Méditerranéenne, Université, Avenue de Villeneuve, 66860 Perpignan Cedex, France Laboratoire de Biologie Générale, Faculté des Sciences, Université de Yaoundé I, B.P. 812 Yaoundé, Cameroun Department of Zoology, The Natural History Museum, Cromwell Road, South Kensingston, London, UK
S. Morand
Affiliation:
Laboratoire de Biologie Animate (URA CNRS 698), Centre de Biologie et d'Ecologie Tropicale et Méditerranéenne, Université, Avenue de Villeneuve, 66860 Perpignan Cedex, France
D. Imbert-Establet
Affiliation:
Laboratoire de Biologie Animate (URA CNRS 698), Centre de Biologie et d'Ecologie Tropicale et Méditerranéenne, Université, Avenue de Villeneuve, 66860 Perpignan Cedex, France
B. Delay
Affiliation:
Laboratoire de Génétique et Environnement, Institut des Sciences de l'Evolution, Université de Montpellier II, place E. Bataillon, 34095 Monpellier Cedex 5, France
J. Jourdane*
Affiliation:
Laboratoire de Biologie Animate (URA CNRS 698), Centre de Biologie et d'Ecologie Tropicale et Méditerranéenne, Université, Avenue de Villeneuve, 66860 Perpignan Cedex, France
*
*Corresponding author. Laboratoire de Biologie Animale, Centre de Biologie et d'Ecologie Tropicale et Méditerranéenne, Université, Avenue de Villeneuve, 66860 Perpignan Cedex, France. Tel: +33 68 66 21 82. Fax: + 33 68 66 22 81. E-mail: jourdane@univ-perp.fr.
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Summary

A study on the immune and mating interactions between Schistosoma intercalatum and S. mansoni has been carried out. The immunologically mediated interactions and mating patterns observed between the two species demonstrate that S. mansoni is competitively dominant over S. intercalatum. When S. mansoni females are absent, S. mansoni males are more competitive than S. intercalatum males at pairing with S. intercalatum females. The use of a mathematical model shows how the abundance of S. mansoni worms per host could dramatically affect the mating probability of S. intercalatum females with their homologous males. It appears that the competitive exclusion between these two species of schistosomes may probably be an important factor restricting the distribution of S. intercalatum in Africa.

Keywords

competitive exclusionSchistosoma mansoniSchistosoma intercalatumgeographic distributionimmunitymating competitionsex ratio
Type
Research Article
Information
Parasitology , Volume 113 , Issue 2 , August 1996 , pp. 129 - 136
Copyright
Copyright © Cambridge University Press 1996

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