Weight loss and survival of Biomphalaria Glabrata deprived of water

Vianey‐Liaud, Monique; Lancastre, F.

doi:10.1590/s0074-02761986000200012

Cited by 9 publications

(7 citation statements)

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“…IE snails lost more weight during the experimental period than did IS snails; the increased weight loss in IE snails was probably due to loss of water, as reported previously (von Brand et al, 1957;Vianey-Liaud andLancastre, 1986a, 1986b) for aestivated B. glabrata snails.…”

Section: Discussionsupporting

confidence: 81%

Effects of Aestivation and Starvation on the Neutral Lipid and Phospholipid Content of Biomphalaria Glabrata Infected With Schistosoma Mansoni

White

Fried

Sherma

2007

Journal of Parasitology

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The effects of aestivation or starvation on the neutral lipid and phospholipid content of Biomphalaria glabrata patently infected with Schistosoma mansoni were determined by high-performance thin-layer chromatography-densitometry. Infected-aestivated snails were maintained in a moist chamber at 24 +/- 1 C and a relative humidity of 98 +/- 1%. Infected-starved snails were maintained in artificial spring water (ASW) at 23 +/- 1 C without exogenous food. Infected snails (the controls) were maintained in ASW at 23 +/- 1 C and fed lettuce ad libitum. The 3 groups were maintained in the laboratory for 7 days, and then the lipids from the digestive gland-gonad complex (DGG) were extracted and analyzed by class. Infected-aestivated snails exhibited greater mortality rate and weight loss after 7 days than did the infected-starved snails. The steryl ester concentration in the infected-starved snails was significantly increased (P = 0.010) compared with the controls but not compared with infected-aestivated snails; the concentration of phosphatidylcholine in infected-aestivated snails was significantly decreased (P = 0.007) compared with the controls but not when compared with the infected-starved snails. Aestivation or starvation had a significant effect on the concentration of certain lipid classes in the DGG of B. glabrata infected with S. mansoni.

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Section: Discussionsupporting

confidence: 81%

Effects of Aestivation and Starvation on the Neutral Lipid and Phospholipid Content of Biomphalaria Glabrata Infected With Schistosoma Mansoni

White

Fried

Sherma

2007

Journal of Parasitology

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“…Indeed, previous experiments had shown that this value is close to the extreme resistance of snails submitted to constant hunger (group 6 in the present paper) when they are reared in water (von Brand et al, 1957;Vianey-Liaud, 1984, 1990Vianey-Liaud & Lancastre, 1986). …”

Section: Discussionsupporting

confidence: 82%

Effects of intermittent starvation on mature Biomphalaria glabrata (Gastropoda: Planorbidae)

Vianey‐Liaud

Lancastre

1994

Hydrobiologia

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Mature Biomphalaria glabrata, submitted to four weeks of varied starvation times (0, 1, 3, 5, 6 & 7 d.week-1, were thereafter refed during four weeks. The different intermittent starvation times had no significant effect on snails survival. As weekly starvation increased, the rate of change in body weight and fecundity decreased. In snails fed one or two d.week -1, the rate of change in body weight was negative, while fecundity remained at a low level. Continuous hunger stopped oviposition.Starvation had no further effect on body growth after the first week of refeeding; however, its effect on fecundity remained significant over the two first weeks.

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“…It is known that freshwater snails of the genus Biomphalaria, intermediate hosts of Schistosoma mansoni, are tolerant to anoxia exposure, starvation, and desiccation/estivation (Richards 1967;Sturrock 1970;Vianey-Liaud and Lancastre 1986;Teles and Marques 1989;Ohlweiler and Kawano 2001). Other studies have also described the metabolic adjustments that are made under these conditions (Becker 1983;Patience et al 1983;Meyer et al 1986;Wolmarans 1987;Thompson and Mejiascales 1993;Bezerra et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Role of antioxidant defenses during estivation and anoxia exposure in the freshwater snailBiomphalaria tenagophila(Orbigny, 1835)

Ferreira¹,

Alencastro²,

Hermes‐Lima³

2003

Can. J. Zool.

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The effects of 24 h of exposure to underwater anoxia and 15 days of estivation (at 2627°C) on the enzymatic antioxidant system of the hepatopancreas of the freshwater snail Biomphalaria tenagophila (Planorbidae) are described. The effect of 24 h of recovery was also investigated. Catalase activity dropped by 31% during 24 h of anoxia, and superoxide dismutase (SOD) activity was reduced by 43% during the 15 days of estivation. This is consistent with the overall decrease in metabolic rate during estivation or anoxia. Indeed, the heartbeat diminished by 2836% during estivation (determination was possible for only 4 days) and by 66% after 24 h of anoxia. On the other hand, selenium-dependent glutathione peroxidase (Se-GPX) activity increased during anoxia (from 10 to 14 mU/mg protein) and estivation (by 14%). Glutathione S-transferase (GST) and glutathione reductase activities remained unchanged during estivation and anoxia. Glucose 6-phosphate dehydrogenase activity was unchanged during estivation and recovery. Recovery restored SOD activity. Catalase, Se-GPX, and GST activities during recovery were significantly lower than those of the respective controls. Lipid peroxidation, determined as the level of thiobarbituric acid-reactive substances, was unchanged in the hepatopancreas after 15 days of estivation and 26 h of recovery from estivation. It is possible that the increase in Se-GPX activity during anoxia and estivation, and the maintenance of GST activity, are relevant in minimizing the effects of reactive oxygen species that can be formed upon resumption of aerobic metabolism. Thus, B. tenagophila may have a biochemical strategy of preparation for oxidative stress such as that observed in several other species of anoxia/hypoxia-tolerant animals.

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Weight loss and survival of Biomphalaria Glabrata deprived of water

Cited by 9 publications

References 0 publications

Effects of Aestivation and Starvation on the Neutral Lipid and Phospholipid Content of Biomphalaria Glabrata Infected With Schistosoma Mansoni

Effects of Aestivation and Starvation on the Neutral Lipid and Phospholipid Content of Biomphalaria Glabrata Infected With Schistosoma Mansoni

Effects of intermittent starvation on mature Biomphalaria glabrata (Gastropoda: Planorbidae)

Role of antioxidant defenses during estivation and anoxia exposure in the freshwater snailBiomphalaria tenagophila(Orbigny, 1835)

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