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Inter-specific parasite competition: mixed infections of Schistosoma mansoni and S. rodhaini in the definitive host

Published online by Cambridge University Press:  24 January 2008

A. J. NORTON ,
J. P. WEBSTER ,
R. A. KANE  and
D. ROLLINSON
A. J. NORTON*
Affiliation:
Department of Infectious Disease Epidemiology, Imperial College Faculty of Medicine, London W2 1PG, UK Department of Zoology, The Natural History Museum, London SW7 5BD, UK
J. P. WEBSTER
Affiliation:
Department of Infectious Disease Epidemiology, Imperial College Faculty of Medicine, London W2 1PG, UK
R. A. KANE
Affiliation:
Department of Zoology, The Natural History Museum, London SW7 5BD, UK
D. ROLLINSON
Affiliation:
Department of Zoology, The Natural History Museum, London SW7 5BD, UK
*
*Corresponding author: Department of Infectious Disease Epidemiology, Imperial College Faculty of Medicine, London W2 1PG, UK. Tel: +0207 594 3819. Fax: +0207 402 3927. E-mail: alice.norton@imperial.ac.uk
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Summary

Competition between parasite species has been predicted to be an important force shaping parasite and host ecology and evolution, although empirical data are often lacking. Using the Mus musculus-Schistosoma mansoni and Schistosoma rodhaini host-parasite systems we characterized mate choice and inter-specific competition between these two schistosome species. Simultaneous infections revealed species-specific mate preferences for both species as well as suggesting mating competition, with male S. rodhaini appearing dominant over male S. mansoni. S. rodhaini homologous pairs were also shown to have increased reproduction per paired female in the presence of a competitor in simultaneous infections. Overall total reproductive success was, however, similar between the two species under conditions of direct competition due to the greater initial infectivity of S. mansoni in comparison to S. rodhaini. Inter-specific competition was also implicated as increased parasite virulence to the host. The potential effects of such interactions on parasite and host ecology and evolution in nature are discussed.

Keywords

Schistosoma mansoniSchistosoma rodhainiBiomphalaria glabrataMus musculusinter-specificcompetitionvirulence
Type
Original Articles
Information
Parasitology , Volume 135 , Issue 4 , April 2008 , pp. 473 - 484
Copyright
Copyright © Cambridge University Press 2008

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