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Redial generations of Fasciola hepatica: a review

Published online by Cambridge University Press:  01 September 2009

D. Rondelaud ,
M. Belfaiza ,
P. Vignoles ,
M. Moncef  and
G. Dreyfuss
D. Rondelaud*
Affiliation:
UPRES EA n° 3174/USC INRA, Faculties of Medicine and Pharmacy, 87025Limoges, France
M. Belfaiza
Affiliation:
Laboratory of Environmental Studies and Analyses, Team of Hydrobiology, Department of Biology, Faculty of Science, Chouaïb Doukkali University, BP 20, 24000El Jadida, Morocco
P. Vignoles
Affiliation:
UPRES EA n° 3174/USC INRA, Faculties of Medicine and Pharmacy, 87025Limoges, France
M. Moncef
Affiliation:
Laboratory of Environmental Studies and Analyses, Team of Hydrobiology, Department of Biology, Faculty of Science, Chouaïb Doukkali University, BP 20, 24000El Jadida, Morocco
G. Dreyfuss
Affiliation:
UPRES EA n° 3174/USC INRA, Faculties of Medicine and Pharmacy, 87025Limoges, France
*
*Fax: 33-555-435893 E-mail: daniel.rondelaud@unilim.fr
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Abstract

An update on the redial generations of Fasciola hepatica was carried out to highlight the different developmental patterns of rediae, the effects of some factors on these generations, and the consequences of such developmental patterns on cercarial productivity. The development of generations is dependent on the behaviour of the first mother redia of the first generation. If this redia remains alive throughout snail infection, it produces most second-generation rediae. In contrast, if it dies during the first weeks, daughter redia formation is ensured by a substitute redia (the second mother redia of the first generation, or the first redia of the second generation). Environmental and biotic factors do not modify the succession of redial generations, but most act by limiting the numbers of rediae, either in all generations, or in the second and/or third generations. An abnormal development of rediae reduces the number of cercariae and most are formed by the second cohort of the first generation. By contrast, most cercariae are produced by the first cohort of the second generation when redial development is normal. The mother rediae described by previous authors might correspond to the first generation and the second cohort of the second generation, while daughter rediae would be the second cohort of the second generation and the first cohort of the third generation. Under certain circumstances, daughter redia formation is ensured by the first two mother rediae or all first-generation rediae, thus demonstrating that the first mother redia is not the only larva to ensure daughter redia formation.

Type
Review Article
Information
Journal of Helminthology , Volume 83 , Issue 3 , September 2009 , pp. 245 - 254
Copyright
Copyright © Cambridge University Press 2009

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