Les générations rédiennes de <i>Fasciola hepatica L.</i>chez <i>Lymnaea truncatula</i> Müller à propos des effets de plusieurs facteurs

Rondelaud, D.; Barthe, D

doi:10.1051/parasite/1982573245

Cited by 25 publications

(18 citation statements)

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“…It is logical to think that the dual infection of L. truncatula using a single miracidium of each trematode induced only a slight delay in the development of the respective lar- val forms. This assumption agrees with the observations of Rondelaud and Barthe (1982) in L. truncatula exposed to 1, 2, 5, 10, or 20 F. hepatica miracidia per snail: according to these authors, there was no delay in larval development in snails exposed to 1 or 2 miracidia each; in contrast, a delay appeared in the 5-miracidia group, and this delay increased in the groups exposed to 10 and 20 miracidia per snail. In snails in cross-exposed groups harboring larval forms of one trematode, the development of the redial burden was similar to that observed in the corresponding control group.…”

Section: Discussionsupporting

confidence: 91%

Paramphistomum daubneyi and Fasciola hepatica : the redial burden and cercarial shedding in Lymnaea truncatula subjected to successive unimiracidial cross-exposures

Augot¹,

Abrous²,

Rondelaud³

et al. 1996

Parasitology Research

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The development of redial burden and cercarial shedding were studied in two groups of Lymnaea truncatula subjected to successive cross-exposures to one miracidium of Paramphistomum daubneyi and one of Fasciola hepatica per snail, or vice versa. The results were compared with those obtained in controls subjected to two unimiracidial exposures to the same trematode species. The infection rate was 61% in the group cross-exposed to P. daubneyi/F. hepatica and 37% in that cross-exposed to F. hepatica/P. daubneyi; it was 37% in the control group exposed to F. hepatica and 21% in that exposed to P. doubneyi. Snails harboring larval forms of both trematodes were few in number in cross-exposed groups and the redial burden was low, with one trematode dominating over the other. Free cercariae of F. hepatica and those of P. daubneyi were significantly more numerous at day 35 in the group cross-exposed to P. daubneyi/F. hepatica than in the controls or the other cross-exposed group. Mixed cercarial sheddings were obtained from 40% of snails with emission in the group cross-exposed to P. daubneyi/F. hepatica and from 21% of those in the F. hepatica/P. daubneyi group. The numbers of P. daubneyi metacercariae were significantly greater in the group cross-exposed to P. daubneyi/F. hepatica than in the other cross-exposed group, whereas no significant difference in mean numbers was noted for the F. hepatica cysts. Repartition of metacercariae over the patent period was clearly more irregular for P. daubneyi than for the other trematode.

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Section: Discussionsupporting

confidence: 91%

Paramphistomum daubneyi and Fasciola hepatica : the redial burden and cercarial shedding in Lymnaea truncatula subjected to successive unimiracidial cross-exposures

Augot¹,

Abrous²,

Rondelaud³

et al. 1996

Parasitology Research

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“…As there was no report on this point in the literature concerning P. daubneyi, this finding was compared with results reported by our team on F. hepatica. According to Rondelaud and Barthe (1982), multiple-miracidium infections of G. truncatula with F. hepatica caused an increase in the number of first-generation rediae, while the numbers of rediae belonging to the second and third generations were strongly decreased. These changes noted in the development of redial generations for P. daubneyi were due to the internal volume of the body of G. truncatula and, consequently, to the amount of nutrients available within the snail's body.…”

Section: Discussionmentioning

confidence: 99%

Paramphistomum daubneyi: the number of sporocysts developing in experimentally and naturally infected Galba truncatula

2008

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Experimental infections of Galba truncatula with Paramphistomum daubneyi were carried out to determine at day 50 (at 24 degrees C) the numbers of sporocysts, which grew in infected snails via the count of first- and second-generation rediae. In snails individually exposed to one, two, three, four, or five miracidia, the numbers of first-generation rediae increased from the one-miracidium group to the five-miracidium snails (from a mean of 6.7 to 26.1), while second-generation rediae decreased in number (from 6.2 to 0.9, respectively). This scale of redial numbers was used to determine the number of sporocysts, which grew in naturally infected snails collected from sedimentary or acid soils between 1993 and 2006. In cercariae-containing snails, natural infections resulting from the development of one to five sporocysts were found in both samples of G. truncatula examined. The numbers of 3-, 4-, and 5-sporocyst infections were increasing over time since 1997, 2000, and 2003, respectively. The utility of such multiple-sporocyst infections is open to question, as the differentiation of second-generation rediae and that of procercariae were delayed and always limited. They might be interpreted as a consequence of a zoonosis, which has been spreading since 1990 in ruminants of central France.

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“…Plusieurs générations rédiennes se succèdent chez la limnée tronquée (Lymnaea truncatula) lorsqu'elle est infestée par Fasciola hepatica (Rondelaud, 1974). Dans les conditions expérimentales, le nombre de ces générations est de trois jusqu'au 49e jour post-exposition à 20 °C (Rondelaud et Barthe, 1978, 1982 : la figure 7 indique la filia tion de ces trois générations à partir d'un seul sporocyste. Le nombre des générations rédiennes pouvant se succéder chez la limnée tronquée n'a pu encore être établi avec certitude : si les rédies de génération 1 se reconnaissent facilement grâce à la lumière Laboratoire d1Histologie, Faculté de Médecine et de Pharmacie,2,F 87032 Limoges Cedex. Accepté le 26 mars 1982.…”

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“…Nos observations portent sur huit séries de limnées tronquées dont les caracté ristiques ont déjà été publiées antérieurement (Rondelaud et Barthe, 1982). Les trois premières séries correspondent à des mollusques provenant de trois localités diffé rentes situées sur terrain silicieux (département de la Haute-Vienne) ; les séries 4 à 6 regroupent des limnées originaires de trois autres localités situées sur terrain calcaire (département de l'Indre et de la Vienne) ; les mollusques des séries 1, 7 et 8 pro viennent de la même localité, mais ont été infestés par des miracidiums provenant de régions différentes.…”

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

Rondelaud¹,

Barthe²

1982

Ann. Parasitol. Hum. Comp.

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RÉSUM É. Les diverses rédies de Fasciola hepatica ont été décomptées chez 398 limnées exposées chacune à un seul miracidium et sacrifiées par la suite au 30e jour post-exposition à 20° C. Lorsque la rédie n° 1 de génération 1 est en vie (327 limnées), elle forme des rédies de génération 2 en nombre élevé (jusqu'à 19), précoces suivie ou non de la production de cercaires. Lorsque cette rédie a dégénéré (71 limnées), une autre rédie -rédie n° 2 de génération 1 ou rédie n° 1 de géné ration 2 suivant le cas -produit alors des rédies filles en nombre peu élevé (jusqu'à 9), plus tar dives en même temps que les cercaires. La signification de ces observations est discutée. The redial generations of Fasciola hepatica L. in Lymnaea truncatulaMillier. Diversity of their development-patterns. SUMMARY. The different rediae of Fasciola hepatica were counted in 398 snails individually exposed to single miracidium and then killed at day 30 post-exposure at 20° C. When the redia n° 1 of generation 1 was alive (327 snails), it produced rediae of generation 2 with high numbers (until 19): these rediae were precocious and could be followed by differentiation of cercariae. When the redia n° 1 of generation 1 was degenerated (71 snails), an other redia -redia n° 2 of generation 1 or redia n° 1 of generation 2-produced daughter rediae with low numbers (until 9): these latter rediae differentiated in the same time as cercariae.The significance of these observations is discussed.

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Les générations rédiennes de Fasciola hepatica L.chez Lymnaea truncatula Müller à propos des effets de plusieurs facteurs

Cited by 25 publications

References 6 publications

Paramphistomum daubneyi and Fasciola hepatica : the redial burden and cercarial shedding in Lymnaea truncatula subjected to successive unimiracidial cross-exposures

Paramphistomum daubneyi and Fasciola hepatica : the redial burden and cercarial shedding in Lymnaea truncatula subjected to successive unimiracidial cross-exposures

Paramphistomum daubneyi: the number of sporocysts developing in experimentally and naturally infected Galba truncatula

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

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