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

Augot, Denis; Abrous, M.; Rondelaud, D.; Dreyfuss, G.

doi:10.1007/s004360050175

Cited by 37 publications

(32 citation statements)

References 8 publications

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“…In contrast, the rediae of F. hepatica recorded in snail co-infections were low in numbers and consisted of R1b and several R2a rediae, whatever the site of collection. Similarly low redial burdens were also reported in snails experimentally infected with both digeneans (Augot et al 1996). As the rediae of P. daubneyi in the present study were more numerous in these dually infected snails than those of F. hepatica (a mean of 7.1±2.7 rediae, instead of 3.6 rediae of F. hepatica in snails originating from the department of Haute Vienne, for example), it is logical to postulate the dominance of P. daubneyi over F. hepatica, as already suggested by Augot et al (1996).…”

Section: Discussionmentioning

confidence: 50%

Fasciola hepatica: the developmental patterns of redial generations in naturally infected Galba truncatula

2004

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A retrospective study on 1,211 snails naturally infected with Fasciola hepatica in central France was carried out to determine the numbers of full-grown sporocysts from which infections derived, to specify the developmental patterns of redial generations (normal or abnormal) and to count live and free rediae. In the department of Haute Vienne (siliceous subsoils), most snails showed single-sporocyst infections, with normal (46.3%) or abnormal (33.9%) development of redial generations. Two-sporocyst infections were scarcer (a total of 10.6%), while snail co-infections with F. hepatica and Paramphistomum daubneyi (8.0%) were found since 1996. In the department of Indre (calcareous subsoils), single-sporocyst infections showing normal development of rediae were the most numerous (58.0%), while the frequency of single-sporocyst infections with abnormal development was strongly decreased (4.3%). Two-sporocyst infections (with normal development of generations) and co-infections with F. hepatica and P. daubneyi slightly increased in frequency. The redial burdens found in snails collected from the department of Indre were significantly higher than those noted in snails originating from the department of Haute Vienne, whatever the type of snail infection; and these increases in numbers especially concerned the rediae of the second and subsequent generations. The results might be explained by the lower calcium ion content (7-23 mg/l) present in waters from the department of Haute Vienne which would induce a slower growth of infected snails (the shell height of adults scarcely reached 8 mm) and, consequently, would create barely favourable conditions for the development of the first rediae of the first generation within snails. However, the quality of the diet provided as food for snails and its influence on the development of redial generations cannot be excluded.

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Section: Discussionmentioning

confidence: 50%

Fasciola hepatica: the developmental patterns of redial generations in naturally infected Galba truncatula

2004

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“…According to Kendall (1950) and Boray (1978), this lymnaeid can only be infected in its first days of life by miracidia of this digenea. By contrast, when preadult snails were subjected to successive infections with P. daubneyi, then with F. hepatica, snail infections were successful, the former digenean species facilitating the larval development of F. hepatica within the snail Augot et al 1996). Two arguments in support of this hypothesis are: (1) the finding of several G. truncatula coinfected by the two digenea in the present study, and (2) the increase in prevalences of natural infections recorded for O. glabra since 1996.…”

Section: Discussionmentioning

confidence: 77%

Fasciola hepatica: epidemiological surveillance of natural watercress beds in central France

2005

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A total of 59 natural watercress beds in the Limousin region (central France) was surveyed over a 15-year period (1990-2004) to detect the contamination of watercress by the metacercariae of Fasciola hepatica and to determine the presence of larval forms in the two species of lymnaeids which live in these waterholes in June and July. The number of beds contaminated with F. hepatica metacercariae varied over the years, and the burden of the larvae on plants was low: a mean of 2.6-6.3 per bed. The same variability was also noted for natural infections of Galba truncatula with F. hepatica, as the annual prevalences ranged from 1.2% to 2.4%. Natural infections of Omphiscola glabra with F. hepatica were only detected from 1996 and the annual prevalences subsequently increased up to 1.4-1.8% between 2001 and 2004. However, for both lymnaeids, the variations in these prevalences with year were insignificant. The contamination of these beds with F. hepatica over the past 15 years was similar to that recorded in the same sites between 1970 and 1986. The main changes were the appearance of another digenea, Paramphistomum daubneyi, in the beds, and the possibility for O. glabra to naturally sustain the larval development of F. hepatica.

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“…Natural infections of this latter snail with F. hepatica and/or another digenean, Paramphistomum daubneyi were reported from the 2000s by several authors (Mage et al, 2002;Dreyfuss et al, 2003Dreyfuss et al, , 2005 on the acid soils of Haute-Vienne. If miracidia of both digenean species penetrate O. glabra during the same time interval (4 h) at exposure, the first parasite which enters the snail favours the development of the other digenean (Augot et al, 1996) so that natural infections with F. hepatica, P. daubneyi, or both can be noted. According to Mage et al (2002), this snail co-infection was frequent on acid soil because of the presence of both digenean species in the same cattle.…”

Section: Methodsmentioning

confidence: 99%

Omphiscola glabra(Gastropoda, Lymnaeidae): Changes occurring in natural infections withFasciola hepaticaandParamphistomum daubneyiwhen this snail species is introduced into new areas

Dreyfuss

Vignoles

Rondelaud

2010

Ann. Limnol. - Int. J. Lim.

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-Cross-transplantations of Omphiscola glabra between two French departments (Haute-Vienne and Indre) were carried out to study snail settlement in these new sites during six years and to determine if this snail species was well adapted to its local parasites (Fasciola hepatica and Paramphistomum daubneyi). Local snails placed in new sites for each department were used as controls. In Indre furrows, the number of adults per population and the area of each habitat peaked on the third year post-introduction. Similar findings were also noted in the Haute-Vienne furrows occupied by local snails but peaks were only observed on the fourth year. In contrast, in Haute-Vienne sites populated by introduced snails, there was a progressive decrease in snail abundance and habitat area from the second year. The local O. glabra transplanted in HauteVienne kept their same degree de susceptibility to F. hepatica and P. daubneyi, thus demonstrating a good adaptation of these snails to their parasites. In other groups of transplanted snails, the first natural infections were only noted from the second or third year post-introduction and their prevalence progressively increased over time. Local adaptation of these latter snails to parasites would be more progressive in time and would stretch over several snail generations.

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

Cited by 37 publications

References 8 publications

Fasciola hepatica: the developmental patterns of redial generations in naturally infected Galba truncatula

Fasciola hepatica: the developmental patterns of redial generations in naturally infected Galba truncatula

Fasciola hepatica: epidemiological surveillance of natural watercress beds in central France

Omphiscola glabra(Gastropoda, Lymnaeidae): Changes occurring in natural infections withFasciola hepaticaandParamphistomum daubneyiwhen this snail species is introduced into new areas

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