| the suitability of several aquatic snails as intermediate hosts for angiostrongylus cantonensis. | sixteen species of aquatic snails of four families were tested by quantitative technique under standardized conditions for their suitability as intermediate hosts for angiostrongylus cantonensis. these species were the planorbid snails biomphalaria glabrata, biomphalaria alexandrina, planorbis planorbis, planorbis intermixtus, bulinus truncatus, bulinus contortus, bulinus africanus, bulinus tropicus and helisoma sp.; the lymnaeid snails lymnaea natalensis, lymnaea tomentosa, lymnaea stagnalis, a ... | 1975 | 1189583 |
| suitability of six lymnaeid snails for infection with fasciola hepatica. | the suitability of fossaria (bakerilymnaea) cubensis and pseudosuccinea columella from louisiana as intermediate hosts for fasciola hepatica was compared to p. columella and stagnicola elodes from ann arbor, mi, s. attenuata from hidalgo, mexico, lymnaea gedrosiana from iran and l. natalensis from senegal. p. columella from la was shown to be a more suitable host (51.3% became infected) than f. (b.) cubensis (15.2% and 26.4% of two populations became infected). the infection rate for p. columell ... | 1987 | 3617426 |
| species- and size-specific infection of snails by cyclocoelum mutabile (digenea: cyclocoelidae). | infectivity of cyclocoelum mutabile miracidia to 9 species and up to 4 size classes of pulmonate snails at 14, 16, and 20 c was studied under laboratory conditions. of the 9 species examined, 6 (stagnicola elodes, lymnaea stagnalis, gyraulus parvus, gyraulus circumstriatus, promenetus exacuous, and armiger crista) were highly susceptible (infection success > or = 25%), 2 (physa jennessi and helisoma trivolvis) had low susceptibility (infection success < 25%, > 0), and 1 (physa gyrina) was not su ... | 1995 | 7623190 |
| field studies on the transmission and survival of cyclocoelum mutabile (digenea) infections in natural snail populations in southern manitoba, canada. | the transmission of cyclocoelum mutabile to snails was examined under natural conditions by sampling the snail communities of 4 natural ponds that had been exposed experimentally to infection by laboratory-infected coots (fulica americana). five of 6 snail species in the ponds, physa jennessi, promenetus exacuous, armiger crista, gyraulus parvus, and stagnicola elodes, became infected. no natural infections were found in the few helisoma trivolvis examined. the second most abundant species prome ... | 1995 | 7623191 |
| the effects of temperature and light on the survival, development, and infectivity of plagiorchis elegans eggs. | plagiorchis elegans eggs were incubated at 0, 4, 10, 20, or 30 c under a 12-hr:12-hr (l:d) photoperiod for 120 days. approximately one-quarter of the eggs had already initiated the process of embryonation when passed with the feces of the hamster (mesocricetus auratus), the experimental definitive host. eggs failed to embryonate at 0 c and died within 2 days. incubation at 4 c allowed full embryonation, but the mean number of embryonated eggs per day (1.32+/-0.15) and the mean number of eggs ava ... | 1998 | 9920308 |
| mechanisms underlying digenean-snail specificity: role of miracidial attachment and host plasma factors. | digenetic trematodes usually show a high degree of specificity for their molluscan intermediate hosts. a panel of 4 digenean species (echinostoma paraensei, e. trivolvis, schistosoma mansoni, and schistosomatium douthitti) and 5 snail species (biomphalaria glabrata, helisoma trivolvis, lymnaea stagnalis, stagnicola elodes, and helix aspersa representing 3 gastropod families) was used to assess the relative contributions of miracidial behavior, host plasma osmolality, and host plasma factors in d ... | 2000 | 11128473 |
| a comparative study of mechanisms underlying digenean-snail specificity: in vitro interactions between hemocytes and digenean larvae. | a panel of 4 digenetic trematode species (echinostoma paraensei, e. trivolvis, schistosoma mansoni, and schistosomatium douthitti) and 5 snail species (biomphalaria glabrata, helisoma trivolvis, lymnaea stagnalis, stagnicola elodes, and helix aspersa) was examined to determine if known patterns of host specificity could be explained by the tendency of digenean larvae to be bound by snail hemocytes, or by the ability of larvae to influence the spreading behavior of hemocytes. in short-term (1 hr) ... | 2000 | 11128474 |
| larval stages of trematodes in gastropods from lake chicnahuapan, state of mexico, mexico. | during the period from january to december (2007), 1,095 freshwater molluscs of four species were captured (lymnaea stagnalis, stagnicola elodes, physella cubensis and physa acuta) in lake chicnahuapan, state of mexico, mexico. two hundred seventy-two (24.84% prevalence) of these molluscs were parasitised by 11 trematode species (from which two were not identified at the species level) having six cercariae species and five metacercariae species represented in five families. the cercariae telorch ... | 2009 | 19568770 |
| dragonfly predators influence biomass and density of pond snails. | studies in lakes show that fish and crayfish predators play an important role in determining the abundance of freshwater snails. in contrast, there are few studies of snails and their predators in shallow ponds and marshes. ponds often lack fish and crayfish but have abundant insect populations. here we present the results of field surveys, laboratory foraging trials, and an outdoor mesocosm experiment, testing the hypothesis that insects are important predators of pulmonate snails. in laborator ... | 2007 | 17457617 |
| the effects of the herbicide atrazine on freshwater snails. | atrazine has been shown to affect freshwater snails from the subcellular to community level. however, most studies have used different snail species, methods, endpoints, and atrazine exposure concentrations, resulting in some conflicting results and limiting our understanding. the goal of this study was to address these concerns by (1) investigating the acute and chronic effects of atrazine on four species of freshwater snails (biomphalaria glabrata, helisoma trivolvis, physa acuta, and stagnico ... | 2015 | 25971234 |
| effects of plagiorchis elegans (digenea: plagiorchiidae) infection on the reproduction of biomphalaria glabrata (pulmonata: planorbidae). | infection with the digenean parasite plagiorchis elegans dramatically reduced the reproductive output of biomphalaria glabrata exposed to the parasite as juveniles or adults. the total number of eggs produced by infected snails was reduced to approximately 7 and 13% of control values, respectively. parasitic castration was attributed to the presence of mother sporocysts that readily established in the tissues of this incompatible host. infection did not result in the production of cercariae but ... | 1998 | 9794632 |
| cockroach allatostatin-like immunoreactivity in the central nervous system of the freshwater snails bulinus globosus (planorbidae) and stagnicola elodes (lymnaeidae). | allatostatin-like immunoreactivity was demonstrated in the central nervous system (cns) neurons of the freshwater pulmonate snails bulinus globosus (planorbidae) and stagnicola elodes (lymnaeidae). immunopositive neurons were localized using a monoclonal antibody highly specific to allatostatin i (apsgaqrlygfgl-amide) from the cockroach diploptera punctata. all cns ganglia in both snail species contained immunopositive neurons. the pedal ganglia showed large numbers (80-100) of neurons in bulinu ... | 1997 | 9169120 |
| effects of the herbicide atrazine's metabolites on host snail mortality and production of trematode cercariae. | environmental stressors have the potential to greatly impact the transmission of parasites with complex, multi-host life cycles such as those of trematodes. the commonly used herbicide atrazine has been shown to affect the susceptibility of second intermediate hosts (such as larval amphibians) to trematode infection, as well as the longevity and infectivity of the free-swimming cercariae, but not eggs or the free-swimming miracidia that infect the gastropod first intermediate hosts. however, we ... | 2011 | 21554070 |