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The presence of predators modifies the larval development of Fasciola hepatica in surviving Lymnaea truncatula

Published online by Cambridge University Press:  12 April 2024

D. Rondelaud ,
P. Vignoles  and
G. Dreyfuss
D. Rondelaud*
Affiliation:
UPRES EA no. 3174, Facultés de Pharmacie et de Médecine, 2 rue du Docteur Raymond Marcland, 87025 Limoges Cedex, France
P. Vignoles
Affiliation:
UPRES EA no. 3174, Facultés de Pharmacie et de Médecine, 2 rue du Docteur Raymond Marcland, 87025 Limoges Cedex, France
G. Dreyfuss
Affiliation:
UPRES EA no. 3174, Facultés de Pharmacie et de Médecine, 2 rue du Docteur Raymond Marcland, 87025 Limoges Cedex, France
*
*Fax: 33 5 55 43 58 93 Email: [email protected]
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Abstract

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Experimental infections of Lymnaea truncatula with Fasciola hepatica were performed to study the consequences of the presence of predators (sciomyzid larvae or zonitid snails) on the characteristics of larval F. hepatica development in surviving snails. Controls consisted of infected snails that were not subjected to predators. Compared to controls, the survival rate at day 30 post-exposure, the duration of cercarial shedding, and the number of cercariae shed by surviving snails were significantly lower when predators were present in snail breeding boxes, whatever the type of predator used. In contrast, the prevalences of Fasciola infections in snails, and the length of time between exposure and the onset of cercarial shedding showed no significant variation. The progressive development of a stress reaction in surviving snails against predators during the first 30 days of experimental exposure to F. hepatica would influence snail survival during the cercarial shedding period and, consequently, the number of cercariae shed by the snails.

Type
Research Article
Information
Journal of Helminthology , Volume 76 , Issue 2 , June 2002 , pp. 175 - 178
Copyright
Copyright © Cambridge University Press 2002

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