Effect of Bayluscide WP 70® on the kinetic behaviour of Biomphalaria straminea in laboratory conditions

Sarquis, Otília; Pieri, Otávio Sarmento; Cunha, Rodolfo Armando da; Jurberg, Pedro

doi:10.1590/s0074-02761998000700043

Cited by 11 publications

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“…The high escape percentage observed at concentrations of 0.2, 0.4 and 0.6 mg/l are in accord with data cited in the literature, such as the studies by Pieri and Jurberg (1981), Jurberg et al (1985) and Sarquis et al (1997Sarquis et al ( , 1998, where the various authors associate this movement to the toxic properties of natural and synthetic molluscides. This behavior shows an attempt by the snails to escape from an environment whose conditions threaten their survival.…”

Section: Discussionsupporting

confidence: 90%

“…hislopii latex on B. glabrata, the main intermediate host of S. mansoni in Brazil, at the concentrations recommended by the WHO (Mott 1987), this study is groundbreaking. The objective is to minimize the environmental effects on the limnic ecosystem.As there are small seasonal variations in the lethal latex concentration against Biomphalaria tenagophila recorded by Schall et al (1992), we conducted the present study with latex collected during one season, autumn, in order to avoid seasonal variations in the composition, and thus in the latex's effect on the snail.The high escape percentage observed at concentrations of 0.2, 0.4 and 0.6 mg/l are in accord with data cited in the literature, such as the studies by Pieri and Jurberg (1981), Jurberg et al (1985) and Sarquis et al (1997Sarquis et al ( , 1998, where the various authors associate this movement to the toxic properties of natural and synthetic molluscides. This behavior shows an attempt by the snails to escape from an environment whose conditions threaten their survival.…”

supporting

confidence: 90%

“…Application of this product caused biocidal action on non-target plants and animals (Andrews et al 1983), besides causing genotoxicity and carcinogenic effects (Vega et al 1988). The high cost (Pieri 1995), the possibility of recolonization of breeding grounds (Sarquis et al 1997(Sarquis et al , 1998, and the ecological toxicity of this product were limitations on its use as an official molluscide in government programs to control schistosomiasis.At the same time, various plants were tested as natural molluscides. Jurberg et al (1989) (Mendes et al 1984).…”

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Physiological changes in Biomphalaria glabrata say, 1818 (Pulmonata: Planorbidae) caused by sub-lethal concentrations of the latex of Euphorbia splendens var. hislopii N.E.B (Euphorbiaceae)

Mello-Silva

Vasconcellos

Pinheiro

et al. 2006

Mem. Inst. Oswaldo Cruz

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Molluscides have been used as one of the strategies to control schistosomiasis. Many plant extracts with molluscidal effects have been tested, but the action of the latex of Euphorbia splendens var. hislopii is considered the most promising because it meets the recommendations of the World Health Organization (WHO). The objective of this study was to determine the lethal dose and identify the effects of the different doses of latex of E. splendens var.hislopii on the physiology of Biomphalaria glabrata submitted to treatment for 24 h. The concentrations of glucose, uric acid and total proteins in the hemolymph and of glycogen in the digestive gland and cephalopodal mass were determined. The LD 50 value was 1 mg/l. The highest escape index was found to be at a concentration of 0.6 mg/l. The results showed that the latex of E. splendens var. hislopii caused a sharp reduction in the reserves of glycogen in the digestive gland and elevation of the protein content in the hemolymph of B. glabrata. Key words: plant molluscide -Euphorbia splendens var. hislopii -Biomphalaria glabrataThe use of molluscides as one of the strategies to control schistosomiasis began in Brazil in 1976, with the creation of the Special Schistosomiasis Control Program by the National Health Foundation (Machado 1982). The product used in the program was niclosamide, an ethanolamine salt of 2',5-dichloro-4'-nitrosalicylanilide, manufactured under the trade name Bayluscide  , whose efficacy had previously been established (Gonnert 1961). Application of this product caused biocidal action on non-target plants and animals (Andrews et al. 1983), besides causing genotoxicity and carcinogenic effects (Vega et al. 1988). The high cost (Pieri 1995), the possibility of recolonization of breeding grounds (Sarquis et al. 1997(Sarquis et al. , 1998, and the ecological toxicity of this product were limitations on its use as an official molluscide in government programs to control schistosomiasis.At the same time, various plants were tested as natural molluscides. Jurberg et al. (1989) (Mendes et al. 1984). Of these, E. splendens stands out for its molluscidal activity in doses under 0.5 mg/l, eight times smaller than the lethal dose for fish (Vasconcellos & Schall 1986).Some questions have arisen in the selection of plant molluscides, such as: toxicity, availability, annual growth, adaptability to different local conditions, and location of molluscidal activity in parts of the plant that easily regenerate, such as the leaves. To be eligible for use, a product must be storable and remain viable for at least one year; be physically and chemically stable; have ethnobotanical value; and be easy to extract and apply, preferably in aqueous extracts (Kloos & McCullough 1982). Considering all these criteria, in 1998 the Oswaldo Cruz Institute (IOC, Fiocruz, RJ) obtained a biotechnology patent on a method to collect, extract and apply E. splendens var. hislopii latex as a molluscide (Vasconcellos 2000).In the published works on plants with molluscidal action and ...

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Section: Discussionsupporting

confidence: 90%

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Physiological changes in Biomphalaria glabrata say, 1818 (Pulmonata: Planorbidae) caused by sub-lethal concentrations of the latex of Euphorbia splendens var. hislopii N.E.B (Euphorbiaceae)

Mello-Silva

Vasconcellos

Pinheiro

et al. 2006

Mem. Inst. Oswaldo Cruz

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“…Toxicological analysis of the effects of a molluscicidal product on the locomotor parameters of snails as intermediate hosts was first described by Sarquis et al (1998). They verified the effect of the exposure to Bayluscide WP 70 (niclosamide) on Biomphalaria straminea, an intermediate host responsible for the transmission of schistosomiasis in northeastern Brazil.…”

Section: Discussionmentioning

confidence: 94%

Behavioral response of Biomphalaria glabrataexposed to a sublethal concentration of Euphorbia miliivar. hislopii latex

Alberto-Silva

Cunha

Costa

et al. 2020

An. Acad. Bras. Ciênc.

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The Euphobia milii var. hislopii latex has been tested in the control of schistosomiasis but its action in the locomotor activity of Biomphalaria glabrata is unknown. The objective of this work was to study the locomotor and reproductive behaviors of B. glabrata exposed to E. milii var. hislopii latex. For this, 96 snails were individually exposed to the latex (LC 50-0.53 mg / L) for 24 hours. The specimens were submitted to biomonitoring for image analysis to record the locomotor parameters at different times: before exposure (control), one day post exposure (group 1 d-p-e) and 30 days post exposure (group 30 d-p-e). The reproductive parameters were recorded weekly for 10 weeks. All locomotor activities of group 1 d-p-e decreased significantly. The egg/egg mass ratio decreased the week after exposure while there was an increase in the hatching rate. After 30 days, these reproductive parameters were similar to those observed in these same snails before exposure. However, the number of hatched snails declined after exposure until the end of the experiment. The influence of the latex in the parameters of B. glabrata added further evidence that this natural water-soluble product can be an important tool for the control of schistosomiasis.

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“…Changes in the locomotory activity of B. glabrata infected with S. mansoni have been studied by several authors, including its movement in relation to various stimuli, such as light, depth and the use of molluscicides (Jurberg et al, 1987(Jurberg et al, , 1988(Jurberg et al, , 1995Pieri and Jurberg, 1981;Sarquis et al, 1998). Boissier et al (2003) reported that uninfected snails moved greater distances at faster rates and with shorter rest periods in comparison with infected snails.…”

Section: Introductionmentioning

confidence: 99%

Changes in the locomotory and reproductive behavior of Biomphalaria glabrata infected with Schistosoma mansoni

Alberto-Silva

Santos

et al. 2015

Experimental Parasitology

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The infection and development of a parasite may cause physiological, morphological and behavioral changes in its host. Changes in the locomotory activity of a host induced by their parasites may also influence the life-cycles of both host and parasite in the environment. The aim of the present work was to evaluate the locomotory activities of Biomphalaria glabrata before and after an experimental infection with Schistosoma mansoni relating to the shedding of cercaria. In addition, the reproductive parameters of infected B. glabrata were analyzed during the prepatent and patent periods of the infection. The locomotory activity was recorded using an image analysis biomonitoring system based on a Videomex V. Five parameters were analyzed: 'Distance traveled', 'Ambulatory time', 'Stereotypic time', 'Resting time' and 'Average speed'. The number of shed cercariae was counted twice at 45 and 52 days post-infection. The reproductive parameters of infected B. glabrata analyzed were the numbers of egg masses, eggs and hatched snails. All statistical analyses were performed using the R program. Of the 69 snails infected with S. mansoni, 33 (47.8%) shed cercariae ('positive') and 36 (52.2%) ('exposed') failed to exhibit any cercarial shedding prior to the end of the experiment. The locomotory activity of the all snails increased significantly after infection with S. mansoni. However, when the 'positive' and 'exposed' snails were compared, the former, shedding cercariae, were less motile. With regard to reproduction, 84.8% (28/33) of the 'positive' and 27.7% (10/36) of the 'exposed' snails failed to lay egg masses during patent period. The number of cercariae individually shed by each 'positive' snail presented a positive relation with 'Stereotypic time' and a negative relation with egg laying. Our findingshighlight the way in which infection with S. mansoni affects the locomotory and the reproductive behavior of B. glabrata. The number of cercariae shed is directly associated with the reduction/interruption in egg-laying and with an increase in random movement.

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Effect of Bayluscide WP 70® on the kinetic behaviour of Biomphalaria straminea in laboratory conditions

Cited by 11 publications

References 0 publications

Physiological changes in Biomphalaria glabrata say, 1818 (Pulmonata: Planorbidae) caused by sub-lethal concentrations of the latex of Euphorbia splendens var. hislopii N.E.B (Euphorbiaceae)

Physiological changes in Biomphalaria glabrata say, 1818 (Pulmonata: Planorbidae) caused by sub-lethal concentrations of the latex of Euphorbia splendens var. hislopii N.E.B (Euphorbiaceae)

Behavioral response of Biomphalaria glabrataexposed to a sublethal concentration of Euphorbia miliivar. hislopii latex

Changes in the locomotory and reproductive behavior of Biomphalaria glabrata infected with Schistosoma mansoni

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