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Fasciola hepatica and Paramphistomum daubneyi: field observations on the transport and outcome of floating metacercariae in running water

Published online by Cambridge University Press:  12 April 2024

D. Rondelaud ,
P. Vignoles ,
C. Vareille-Morel ,
M. Abrous ,
C. Mage ,
R. Mouzet  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
C. Vareille-Morel
Affiliation:
Faculté des Sciences, 123 avenue Albert Thomas, 87060, Limoges, Cedex, France
M. Abrous*
Affiliation:
UPRES EA no. 3174, Facultés de Pharmacie et de Médecine, 2 rue du Docteur Raymond Marcland, 87025, Limoges, Cedex, France Société Parabio, Incubateur Limousin d'Entreprises, Ester Technopole, BP 6935, 87069, Limoges, Cedex, France
C. Mage
Affiliation:
Institut de l'Elevage, Ester Technopole, BP 69021, 87069, Limoges, Cedex, France
R. Mouzet
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
*
*Author for correspondence Fax: 33 555 435893 Email: [email protected]
*Author for correspondence Fax: 33 555 435893 Email: [email protected]
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Abstract

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Experimental investigations in eight open drainage ditches and furrows from central France were carried out to analyse the dispersal of floating metacercariae of two digenean species by running water and to determine the outcome of larvae which settled on Nasturtium officinale (watercress). The frequencies of larvae found after their transport by water ranged from 33% to 49.7%, thus indicating that more than half of the metacercariae used in this experiment had fallen to the bottom of the water during this transport. The nature of the site (furrow, or ditch supplied by a spring) had a significant effect on the distribution of floating larvae, while the digenean species had no effect. Low percentages of metacercariae on watercress were noted in furrows (3.5–4.3% of larvae) and ditches (0.8–1.3%). When the watercress grew, most larvae that had settled on leaves and stems died but there were always several living metacercariae on this plant (0.7–1.5% of larvae for Fasciola hepatica and 0.2–0.5% for Paramphistomum daubneyi). The weak buoyancy of these floating cysts on running water limited their dispersal and, consequently, led to a real diminution of risks incurred by definitive hosts towards these metacercariae.

Type
Review Article
Information
Journal of Helminthology , Volume 78 , Issue 2 , June 2004 , pp. 173 - 177
Copyright
Copyright © Cambridge University Press 2004

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