Interactions related to non-host snails in the host-finding process of Euparyphium albuferensis and Echinostoma friedi (Trematoda: Echinostomatidae) miracidia

Muñoz-Antolí, Carla; Trelis, María; Gozalbo, Mónica; Toledo, Rafael; Haberl, Bernhard; Esteban, J. Guillermo

doi:10.1007/s00436-003-0968-5

Cited by 13 publications

(3 citation statements)

References 14 publications

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“…This may be attributed to different factors depending on snails and parasites and their complex relationships. For instance, in some snail-trematode systems, it has been demonstrated experimentally that some non-host snail species (resistant to infection) can act as a decoy, thus interfering and consequently reducing the rate of infection of the host species with which the habitat is shared [32]. Populations with phenotypic differences in susceptibility to infection by certain trematode species have also been described within the same species [33].…”

Section: Discussionmentioning

confidence: 99%

Transmission of Calicophoron daubneyi and Fasciola hepatica in Galicia (Spain): Temporal follow-up in the intermediate and definitive hosts

et al. 2016

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BackgroundParamphistomosis caused by Calicophoron daubneyi and fasciolosis caused by Fasciola hepatica are common parasitic diseases of livestock animals. Transmission of the diseases depends on the presence of intermediate hosts, i.e. freshwater gastropods such as lymnaeids. We carried out a 2-year-long study of the dynamics of the snail population acting as the intermediate host for these parasites, considering the population structure in terms of size/age and infection status. In addition, we determined the kinetics of trematode egg excretion in grazing cows. Generalized Additive Models (GAMs) were used to analyze the associations between different response variables and snail size, sampling month and weather-related variables.ResultsOf the molluscan species examined, Galba truncatula, Radix peregra, Anisus (Anisus) leucostoma and Pisidium casertanum (n = 2802), only G. truncatula was infected with C. daubneyi or F. hepatica, at prevalence rates of 8.2% and 4.4% respectively. The probability of infection with C. daubneyi or F. hepatica was linearly related to snail size, although in different ways (negative for C. daubneyi and positive for F. hepatica). The total snail population increased in winter, when specimens of all size classes were found. Infected snails were more abundant during spring-autumn. Mature cercariae of both parasites were found in most seasons. In the statistical models, the sampling month accounted for a high percentage (71.9–78.2%) of the observed variability in snail abundance. The inclusion of climatic variables in the models moderately increased the percentage of deviance explained (77.7–91.9%). Excretion of C. daubneyi eggs in cow faeces was always higher than that of F. hepatica eggs.ConclusionsParticular care should be taken to prevent pastures and the surrounding environment being contaminated with parasite eggs during winter-spring, when the number of snails susceptible to miracidial infections is maximal. This is therefore the optimal time for treating grazing animals. Nevertheless, control of trematodosis based only on chemotherapy is difficult in an area such as the study area, where environmental factors favour the regular appearance of snail populations harbouring mature cercariae.Electronic supplementary materialThe online version of this article (doi:10.1186/s13071-016-1892-8) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

Transmission of Calicophoron daubneyi and Fasciola hepatica in Galicia (Spain): Temporal follow-up in the intermediate and definitive hosts

et al. 2016

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“…Te prevalence of F. gigantica cercariae estimated at 21.60% in L. natalensis is higher than that reported by Iglesias-Piñeiro et al [10] in Spain (4.4%) and Mekonnen et al [71]. In contrast, Muñoz-Antoli et al [72] obtained higher prevalences (44.72%) in L. natalensis. Tese diferences could be explained by variation in ecosystems and mollusc-cercaria-animal relationships [73][74][75].…”

Section: Discussionmentioning

confidence: 62%

Abundance, Distribution, and Diversity of Freshwater Snail and Prevalences of Their Infection by Cercaria of Fasciola gigantica and Schistosoma spp at Mayo-Vreck River, Far North Region of Cameroon

Siama,

Eteme Enama,

Kalmobe

et al. 2023

Journal of Tropical Medicine

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Malacological and parasitological studies were conducted from April 2020 to March 2021 to determine the abundance and distribution of molluscs and cercariae of Schistosoma spp and Fasciola gigantica. Collected molluscs are exposed to strong light to induce cercarial release. Mollusc densities were higher at station 1 (Gamak) than in station 8 (Patakai), with Bellamya unicolor and Biomphalaria pfeifferi more abundant and Bulinus truncatus, B. tropicus, and B. globosus less abundant. The overall prevalence of cercariae (19.87%) is higher in station 3 (Yaye orchard), station 9 (Gougni), station 4 (Madiogo), station 5 (Madiogo pasture), and station 6 (Ziam 3). It varies significantly between 15.76% in station 8 and 25.77% in station 3, between 8.48% in B. truncatus and 25.53% in B. globosus, and between 19.27% for cercariae of Schistosoma spp and 21.60% for those of F. gigantica. Cercarial emissions in L. natalensis and B. pfeifferi were higher in hot and cold dry seasons; on the other hand, cercarial emissions in B. globosus were higher in hot dry seasons (31.48%) and rainy seasons (23.38%). Emissions of cercariae from S. haematobium are related to areas of human activity and defecation, while those of F. gigantica in L. natalensis, Schistosoma haematobium in B. tropicus, and S. mansoni in B. pfeifferi are related to grazing areas. Mayo-Vreck is a site that favors the endemicity of fascioliasis and human schistosomiasis.

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“…However, other studies of trematodes and gastropods have found that unintended snail hosts can be infected by trematode parasites (cause a dilution effect). For example, non-host snails can become infected with trematodes that typically infect the intended host species, but variation among infection rates of non-host snails suggests attractiveness or susceptibility to the parasites is not uniform among non-host snails [ 47 – 49 ]. Infection rates of Schistosoma mansoni in Biomphalaria glabrata snails (the intended host) were reduced when non-susceptible snails were also present [ 47 , 50 ].…”

Section: Discussionmentioning

confidence: 99%

No evidence for a dilution effect of the non-native snail, Potamopyrgus antipodarum, on native snails

et al. 2020

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The dilution effect can occur by a range of mechanisms and results in reduced parasite prevalence in host taxa. In invaded ecosystems, the dilution effect can benefit native species if non-native species, acting as resistant or less competent hosts, reduce rates of parasitic infections in native species. In field experiments, we assessed whether manipulating biomass of the non-native snail, Potamopyrgus antipodarum, caused a dilution effect by reducing trematode infections in three taxa of native snails. In contrast to many studies showing resistant or less competent non-native hosts can "dilute" or reduce infection rates, we found no evidence for a dilution effect reducing infection rates of any of the native snails. We suggest that a dilution effect may not have occurred because most trematode taxa are highly host specific, and thus the trematode transmission stages did not recognize the invasive snail as a possible host. In this case, community composition appears to be important in influencing the dilution effect.

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Interactions related to non-host snails in the host-finding process of Euparyphium albuferensis and Echinostoma friedi (Trematoda: Echinostomatidae) miracidia

Cited by 13 publications

References 14 publications

Transmission of Calicophoron daubneyi and Fasciola hepatica in Galicia (Spain): Temporal follow-up in the intermediate and definitive hosts

Transmission of Calicophoron daubneyi and Fasciola hepatica in Galicia (Spain): Temporal follow-up in the intermediate and definitive hosts

Abundance, Distribution, and Diversity of Freshwater Snail and Prevalences of Their Infection by Cercaria of Fasciola gigantica and Schistosoma spp at Mayo-Vreck River, Far North Region of Cameroon

No evidence for a dilution effect of the non-native snail, Potamopyrgus antipodarum, on native snails

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