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Heterozygosity and parasite intensity: lung parasites in the water frog hybridization complex

Published online by Cambridge University Press:  02 October 2007

P. JOLY ,
V. GUESDON ,
E. FROMONT ,
S. PLENET ,
O. GROLET ,
J. F. GUEGAN ,
S. HURTREZ-BOUSSES ,
F. THOMAS  and
F. RENAUD
P. JOLY*
Affiliation:
UMR 5023 Ecology of Fluvial Hydrosystems, Université Claude Bernard Lyon1, F-69622Villeurbanne, France
V. GUESDON
Affiliation:
UMR 5023 Ecology of Fluvial Hydrosystems, Université Claude Bernard Lyon1, F-69622Villeurbanne, France
E. FROMONT
Affiliation:
UMR 5558 Biometry and Evolutionary Biology, Université Claude Bernard Lyon1, F-69622Villeurbanne, France
S. PLENET
Affiliation:
UMR 5023 Ecology of Fluvial Hydrosystems, Université Claude Bernard Lyon1, F-69622Villeurbanne, France
O. GROLET
Affiliation:
UMR 5023 Ecology of Fluvial Hydrosystems, Université Claude Bernard Lyon1, F-69622Villeurbanne, France
J. F. GUEGAN
Affiliation:
UMR CNRS-IRD 9926, Centre for the Study of Micro-organism Polymorphism, 911 Avenue Agropolis – BP 5045, F-34032 Montpellier Cedex 1, France
S. HURTREZ-BOUSSES
Affiliation:
UMR CNRS-IRD 9926, Centre for the Study of Micro-organism Polymorphism, 911 Avenue Agropolis – BP 5045, F-34032 Montpellier Cedex 1, France
F. THOMAS
Affiliation:
UMR CNRS-IRD 9926, Centre for the Study of Micro-organism Polymorphism, 911 Avenue Agropolis – BP 5045, F-34032 Montpellier Cedex 1, France
F. RENAUD
Affiliation:
UMR CNRS-IRD 9926, Centre for the Study of Micro-organism Polymorphism, 911 Avenue Agropolis – BP 5045, F-34032 Montpellier Cedex 1, France
*
*Corresponding author: UMR 5023 Ecology of Fluvial Hydrosystems, Université Claude Bernard Lyon1, F-69622 Villeurbanne, France. Tel: +33 472 433 586. Fax: 33 472 431 141. E-mail: [email protected]
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Summary

In hybridogenetic systems, hybrid individuals are fully heterozygous because one of the parental genomes is discarded from the germinal line before meiosis. Such systems offer the opportunity to investigate the influence of heterozygosity on susceptibility to parasites. We studied the intensity of lung parasites (the roundworm Rhabdias bufomis and the fluke Haplometra cylindracea) in 3 populations of water frogs of the Rana lessonae-esculenta complex in eastern France. In these mixed populations, hybrid frogs (R. esculenta) outnumbered parental ones (R. lessonae). Despite variation in parasite intensity and demographic variability among populations, the relationship between host age and intensity of parasitism suggests a higher susceptibility in parentals than in hybrids. Mortality is probably enhanced by lung parasites in parental frogs. On the other hand, while parental frogs harboured higher numbers of H. cylindracea than hybrid frogs, the latter had higher numbers of R. bufonis. Despite such discrepancies, these results support the hybrid resistance hypothesis, although other factors, such as differences in body size, age-related immunity, differential exposure risks and hemiclonal selection, could also contribute to the observed patterns of infection.

Keywords

hybridhybridogenesiswater frogsRana specieslung parasitesRhabdias bufonisHaplometra cylindracea
Type
Research Article
Information
Parasitology , Volume 135 , Issue 1 , January 2008 , pp. 95 - 104
Copyright
Copyright © Cambridge University Press 2007

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