| molluscs interfering with the capacity of fasciola hepatica miracidia to infect lymnaea truncatula. | fasciola hepatica miracidia labelled with radioselenium were used to study aspects of their host-finding capacity by determining radioactivity subsequently taken up by exposed 'target' snails (lymnaea truncatula). possible interfering effects exercised by a number of non-host snails and bivalves were examined in linear test channels. the infection rate (radioactivity) among 'target' snails was markedly lowered when non-host lymnaea species (l. pereger, l. palustris, l. stagnalis) were interposed ... | 1976 | 980539 |
| a study on snail location by fasciola hepatica using radioisotopically labelled miracidia. | a number of common freshwater molluscs were exposed to fasciola hepatica miracidia labelled in vivo with radioselenium. radioactivity was rapidly incorporated in all lymnaeid species tested (l. stagnalis, l. tomentosa and l. truncatula) whereas no radioactivity could be demonstrated in non-lymnaeid pulmonate species (aplexa hypnorum, physa acuta, physa fontinalis, anisus vortex, gyraulus albus and planorbis planorbis) or in the prosobranchs valvata cristata and valvata piscinalis. however, the p ... | 1976 | 1264488 |
| toxic effects of cadmium and zinc on the transmission of echinoparyphium recurvatum cercariae. | the toxicity of cadmium, zinc and cd/zn mixtures to the transmission of echinoparyphium recurvatum (digenea: echinostomatidae) cercariae into the snail second intermediate hosts was investigated at concentrations ranging from 100 microg l-1 to 10 000 microg l-1 in both soft and hard water. a differential response in the infectivity of metal-exposed cercariae into lymnaea peregra and physa fontinalis was demonstrated which was dependent on the snail species being infected. exposure of l. peregra, ... | 2002 | 12015828 |
| toxicity of anti-fouling biocides to encysted metacercariae of echinoparyphium recurvatum (digenea: echinostomatidae) and their snail hosts. | the toxicity of the anti-fouling biocides tributyltin (tbto), copper, and irgarol 1051 (irgarol) at a nominal concentration of 10 microg/l over a 30 day period were investigated against the viability of metacercarial cysts of the digenean parasite echinoparyphium recurvatum resident within the body of two common freshwater snails, lymnaea peregra and physa fontinalis. reduced parasite viability was found under most exposures in both snail species. however a greater effect of toxicant exposure wa ... | 2004 | 15183997 |
| bird schistosome diversity in iceland: molecular evidence. | during the years 2002-2007, icelandic freshwater snails and birds from different orders were examined for bird schistosomes. only the snail radix peregra and anatid birds proved to be infected. in total, 32 samples of bird schistosome cercariae from seven localities and four samples of adults of anas platyrhynchos and mergus serrator from two localities were used for sequencing of the internal transcibed spacer (its) region of rdna. based on the sequence and position in the phylogenetic tree, fi ... | 2009 | 19296877 |
| activities of jatropha curcas phorbol esters in various bioassays. | jatropha curcas seeds contain 30-35% oil, which can be converted to high quality biodiesel. however, jatropha oil is toxic, ascribed to the presence of phorbol esters (pes). in this study, isolated phorbol ester rich fraction (peef) was used to evaluate the activity of pes using three aquatic species based bioassays (snail (physa fontinalis), brine shrimp (artemeia salina), daphnia (daphnia magna)) and microorganisms. in all the bioassays tested, increase in concentration of pes increased mortal ... | 2011 | 22172520 |
| pseudechinoparyphium echinatum (digenea: echinostomatidae): experimental observations on cercarial specificity toward second intermediate hosts. | infectivity of pseudechinoparyphium echinatum cercariae to 11 species of gastropod was examined experimentally. broad specificity and differential host-parasite compatibility were exhibited. nine gastropod species functioned as second intermediate hosts. planorbarius corneus, physa fontinalis, lymnaea peregra and biomphalaria alexandrina showed high levels of compatibility with the parasite. in single-species exposures over 90% of cercariae encysted in each of these hosts. low compatibility with ... | 1990 | 2362767 |
| effects of a mixture of two insecticides in freshwater microcosms: i. fate of chlorpyrifos and lindane and responses of macroinvertebrates. | effects of chronic application of a mixture of the insecticides chlorpyrifos and lindane were studied in indoor freshwater microcosms. the exposure concentrations (based on 0, 0.005, 0.01, 0.05, 0.1 and 0.5 times the lc50 of the most sensitive standard test organism for each compound) were kept at a constant level for four weeks. the calculated mean concentrations for chlorpyrifos were found to be almost at their corresponding nominal level during the treatment period. the mean calculated lindan ... | 2002 | 12092751 |
| fate of a volatile chlorinated solvent in indoor aquatic microcosms: sublethal and static exposure to [14c]dichloromethane. groupe pour l'etude du devenir de xénobiotiques dans l'environnement (gedexe). | the goal of this work was to study the fate of dichloromethane in indoor aquatic microcosms after a sublethal and static exposure to simulate the accidental contamination of a lenitic ecosystem such as littoral lake zone or a pond. this kind of ecosystem is characterized by high productive capacity and rich biocoenose, and are usually first affected by acute or chronic pollution. microcosms containing immersed bryophytes (fontinalis antipyretica), macrophytes (lemna minor, groenlendia densa, elo ... | 1994 | 7523069 |
| toxicity and bioaccumulation of arsenic and chromium in epigean and hypogean freshwater macroinvertebrates. | lethal toxicity levels of two inorganic water pollutants, chromium (cr6+) and arsenic (as3+), were determined toward six freshwater macroinvertebrate species collected from a single field site. crustaceans were represented by two amphipod species, an epigean one (gammarus fossarum) and a hypogean one (niphargus rhenorhodanensis), and by an isopod species (asellus aquaticus). there were two insect larvae, heptagenia sulphurea (ephemeroptera) and hydropsiche pellucidula (trichoptera) and a snail, ... | 2001 | 11443365 |