Les générations rédiennes de <i>Fasciola hepatica</i> L. chez <i>Lymnaea truncatula</i> müller

Rondelaud, D.; Barthe, D

doi:10.1051/parasite/1982576639

Cited by 14 publications

(14 citation statements)

References 3 publications

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“…The increased redial burden with increasing numbers of fully grown sporocysts agreed with the reports by Kendall (1949) and Rondelaud & Barthe (1982a). The values noted for R1b rediae in snails with a normal developmental pattern also agreed with those reported by Rondelaud & Barthe (1982b) and Rondelaud et al (2009a, b) for G. truncatula . In contrast, in the two- and three-sporocyst infections, there was a difference in the distribution of live rediae according to the three redial categories.…”

Section: Discussionsupporting

confidence: 91%

The development of rediae ofFasciola hepaticainRadix natalensissubjected twice to bimiracidial exposures

Dar

Vignoles²,

Dreyfuss³

et al. 2010

J. Helminthol.

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Experimental infections of Egyptian Radix natalensis with a French isolate of Fasciola hepatica (each snail was subjected twice to a bimiracidial exposure) were carried out to determine how many sporocysts grew in these snails and to study the developmental patterns of redial generations. Single-sporocyst infections were found in 69.3% (34/49) of infected snails, with equivalent numbers of normal and abnormal patterns. Snails with two- and three-sporocyst infections were 24.4% and 6.1%, respectively. In single- and two-sporocyst infections at days 42 and 56 post-exposure, the total redial burden was significantly higher in snails with a normal redial development. In two- and three-sporocyst infections, the overall maturity of rediae was delayed at days 42 and 56. The high frequency of abnormal patterns in R. natalensis (53.1% of all infected snails showed degeneration of a first mother redia) might be due to incomplete adaptation between the snail population and the parasite. The delayed redial maturity in two- and three-sporocyst infections can mainly be explained by the volume of the snail body, which would be insufficient to allow the simultaneous differentiation of most rediae over time.

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Section: Discussionsupporting

confidence: 91%

The development of rediae ofFasciola hepaticainRadix natalensissubjected twice to bimiracidial exposures

Dar

Vignoles²,

Dreyfuss³

et al. 2010

J. Helminthol.

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“…If this larva remains alive throughout snail infection, at least up to day 49 p.e., the development is normal. In contrast, if the first redia dies during week 2 or week 3 of snail infection, the development is abnormal and two variants have been described (Rondelaud & Barthe, 1982b; Belfaiza et al , 2005).…”

Section: Resultsmentioning

confidence: 99%

Redial generations ofFasciola hepatica: a review

Rondelaud¹,

Belfaiza

Vignoles³

et al. 2009

J. Helminthol.

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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.

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“…In French snails infected with sympatric miracidia, the first mother redia (R1a), after its exit from the sporocyst, produces all of the rediae belonging to the first cohort of the second generation (up to 16 R2a rediae per snail), while the other mother redia (R1b redia) only produces a few daughter rediae (up to 6 per snail) belonging to the second cohort from the second generation (R2b rediae) (Rondelaud and Barthe 1982). However, this developmental pattern was not observed in snails infected with allopatric miracidia (a Moroccan isolate in this case); Goumghar et al (2000) described the differentiation of numerous daughter rediae in the body of all firstgeneration mother rediae at day 21 and at day 28 post-exposure (p.e.)…”

Section: Introductionmentioning

confidence: 99%

Fasciola hepatica : the effect of food quality on the development of redial generations in Galba truncatula infected with allopatric miracidia

Belfaiza

Rondelaud

Moncef

et al. 2004

Parasitology Research

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Individual bimiracidial infections of French Galba truncatula with an allopatric (Moroccan) isolate of Fasciola hepatica were carried out under laboratory conditions to count free rediae and intraredial daughter rediae in snails just after their death, and to determine whether feeding the snails on lettuce only or lettuce plus Tetraphyll had an effect on the development of redial generations. Controls consisted of snails infected with sympatric (French) miracidia and reared with lettuce only. In the allopatric group, reared with lettuce only as food, a higher mortality rate of snails in the first 4 weeks of the experiment was noted, and most G. truncatula showed 1-sporocyst infections, with the usual development of redial generations. Compared to the sympatric group, the growth of the first mother redia (R1a redia) in each snail of the allopatric group was significantly slower during the first weeks of infection, whereas a significantly increased formation of intraredial daughter rediae in the other mother rediae (R1b rediae) was noted over the same period. In the allopatric group, reared with cos lettuce and commercial fish food, 1-sporocyst infections (45.5% of snails) and 2-sporocyst infections (53.9%), with the usual development of redial generations, were noted. Compared to the sympatric group, a significantly slower development of the first mother redia during the first weeks of the experiment was noted in the 1-sporocyst infections, whereas the values in the 2-sporocyst infections did not significantly differ from those noted in the sympatric group. Similar results were noted for the production of intraredial daughter rediae in the R1b rediae during the first weeks of the experiment. In all infections derived from the growth of a single sporocyst per snail, the differentiation of numerous daughter rediae inside R1b rediae would be induced by the slow growth of the R1a redia (from which the most important group of R2a rediae originated) during the first weeks of infection and might represent a mechanism to replace free rediae absent from the inside of the snail.

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Les générations rédiennes de Fasciola hepatica L. chez Lymnaea truncatula müller

Cited by 14 publications

References 3 publications

The development of rediae ofFasciola hepaticainRadix natalensissubjected twice to bimiracidial exposures

The development of rediae ofFasciola hepaticainRadix natalensissubjected twice to bimiracidial exposures

Redial generations ofFasciola hepatica: a review

Fasciola hepatica : the effect of food quality on the development of redial generations in Galba truncatula infected with allopatric miracidia

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