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Identifying a key host in an acanthocephalan-amphipod system

Published online by Cambridge University Press:  25 August 2015

ALEXANDRE BAUER  and
THIERRY RIGAUD
ALEXANDRE BAUER*
Affiliation:
Laboratoire Biogéosciences, CNRS UMR CNRS 6282, Université de Bourgogne Franche-Comté, 6 Boulevard Gabriel, 21000 Dijon, France
THIERRY RIGAUD
Affiliation:
Laboratoire Biogéosciences, CNRS UMR CNRS 6282, Université de Bourgogne Franche-Comté, 6 Boulevard Gabriel, 21000 Dijon, France
*
*Corresponding author. Laboratoire Biogéosciences, CNRS UMR CNRS 6282, Université de Bourgogne Franche-Comté, 6 Boulevard Gabriel, 21000 Dijon, France. E-mail: alexandre.bauer@u-bourgogne.fr
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Summary

Trophically transmitted parasites may use multiple intermediate hosts, some of which may be ‘key-hosts’, i.e. contributing significantly more to the completion of the parasite life cycle, while others may be ‘sink hosts’ with a poor contribution to parasite transmission. Gammarus fossarum and Gammarus roeseli are sympatric crustaceans used as intermediate hosts by the acanthocephalan Pomphorhynchus laevis. Gammarus roeseli suffers higher field prevalence and is less sensitive to parasite behavioural manipulation and to predation by definitive hosts. However, no data are available on between-host differences in susceptibility to P. laevis infection, making it difficult to untangle the relative contributions of these hosts to parasite transmission. Based on results from estimates of prevalence in gammarids exposed or protected from predation and laboratory infections, G. fossarum specimens were found to be more susceptible to P. laevis infection. As it is more susceptible to both parasite infection and manipulation, G. fossarum is therefore a key host for P. laevis transmission.

Keywords

Multi-host parasitesprevalencehost specificityhost qualitytransmissioninfectivity
Type
Research Article
Information
Parasitology , Volume 142 , Issue 13 , November 2015 , pp. 1588 - 1594
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Copyright
Copyright © Cambridge University Press 2015 

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