Seasonal variation of the carbohydrate and lipid metabolism in a land pulmonate gastropod, Megalobulimus oblongus

Silva, Roselis S.M. da; Zancan, Denise Maria

doi:10.1016/0300-9629(94)90104-x

Cited by 26 publications

(17 citation statements)

References 6 publications

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“…These results are similar to those ones observed for other species and can be related to energy investment for reproduction and aestivation (Da Silva and Zancan, 1994).…”

Section: Discussionsupporting

confidence: 91%

“…Influence of seasonality on energetic substrates content was recorded for other species of land snails such as Megalobulimus oblongus (Da Silva and Zancan, 1994) and M. abbreviatus (Horn et al, 2005). This variation may be related to metabolic changes caused by environmental variations and the mobilization of energy during the reproductive cycle (Wayne, 2001;Nowakowska, 2006).…”

Section: Discussionmentioning

confidence: 98%

“…Many studies on different species of snails demonstrated the deposition of glycogen in tissues in the autumn, the period previous to hibernation/aestivation, during which it was reduced (Joosse, 1988;Da Silva and Zancan, 1994). However, in B. tenuissimus the concentration of glycogen in digestive gland and cepahalopedal mass tissues remained high in the winter period.…”

Section: Discussionmentioning

confidence: 99%

“…The variation in energy content is related to the reproductive cycle of snails, with accumulation and expenditure of energy for meeting partners, mating and production of eggs (Da Silva and Zancan, 1994;Rosa et al, 2005). The reproductive behavior as well as gametogenesis, is controlled by the neuroendocrine system, which is dependent of external stimuli (Joosse, 1988;Wayne, 2001;De Fraga et al, 2004) Bulimulus tenuissimus is a native land snail widely distributed throughout Brazilian territory (Simone, 2006) and that stands out to act as intermediate host of helminths of veterinary importance and also as an agricultural pest (Thiengo and Amato, 1995).…”

Section: Introductionmentioning

confidence: 99%

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Seasonal changes of energy reserves in Bulimulus tenuissimus (d'Orbigny, 1835) (Mollusca, Bulimulidae)

et al. 2012

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The objective of this study was to evaluate the variation of energy substrates in different seasons in Bulimulus tenuissimus. For this evaluation, substrates were collected from the digestive and albumen glands and foot tissues, which were processed to obtain the concentrations of glucose and galactose. There was seasonal variation in energy reserves in both the digestive gland and the foot of Bulimulus tenuissimus, with a tendency to accumulation from spring to winter. There was greater use of energetic reserves in the spring and summer, being the glycogen stored in the digestive gland the first source consumed. In addition, mobilization of reserves of glycogen in the muscle in summer was observed. The reduction of glycogen coincides with the reproductive cycle of the species, and the expenses generated for the processes of mating and gametogenesis was the cause of this reduction. The concentration of galactogen also varied according to the reproductive period. It was suggested that variations in temperature and photoperiod that occur during the year would act as regulatory mechanisms of energy metabolism of B. tenuissimus.

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“…These results are similar to those ones observed for other species and can be related to energy investment for reproduction and aestivation (Da Silva and Zancan, 1994).…”

Section: Discussionsupporting

confidence: 91%

Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Seasonal changes of energy reserves in Bulimulus tenuissimus (d'Orbigny, 1835) (Mollusca, Bulimulidae)

et al. 2012

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“…Nevertheless, during this period the snail, which is in the starved state, spends part of its endogenous fuel reserves (22,23) and loses some water (14,(24)(25)(26), with a consequent decrease in body weight. In several gastropods heart rate was found to vary with nutritional state (27,28) and with hydration state (29,30).…”

Section: Introductionmentioning

confidence: 99%

Heart rate and body weight alterations in juvenile specimens of the tropical land snail Megalobulimus sanctipauli during dormancy

Rizzatti

Romero

2001

Braz J Med Biol Res

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The time course of heart rate and body weight alterations during the natural period of dormancy were determined in active feeding and dormant juvenile specimens of Megalobulimus sanctipauli. In both groups, heart rate markedly decreased during the first 40 days of dormancy, tending to stabilize thereafter. This time period coincided with the decrease in environmental temperature during autumn-winter. At the end of the dormancy period, surviving active feeding and dormant snails showed a significant decrease in heart rate which, however, was significantly greater in the latter group. Total body weight decreased concomitantly with heart rate in dormant snails but remained constant in active feeding snails. Body hydration induced significant increases in weight and heart rate in surviving dormant snails. Feeding following hydration promoted a new significant increase in heart rate but not in weight. These results indicate that the decrease in heart rate observed in juvenile specimens of M. sanctipauli during dormancy may be due to at least three factors: 1) decrease in environmental temperature during autumn-winter, 2) starvation which leads to the depletion of endogenous fuel reserves and to a probable decrease in hemolymph nutrient levels, and 3) dehydration which leads to a probable decrease in hemolymph volume and venous return and/or to an increase in hemolymph osmolarity. Correspondence

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Control of carbohydrate metabolism in an anoxia‐tolerant nervous system

2010

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Anoxia-tolerant animal models are crucial to understand protective mechanisms during low oxygen excursions. As glycogen is the main fermentable fuel supporting energy production during oxygen tension reduction, understanding glycogen metabolism can provide important insights about processes involved in anoxia survival. In this report we studied carbohydrate metabolism regulation in the central nervous system (CNS) of an anoxia-tolerant land snail during experimental anoxia exposure and subsequent reoxygenation. Glucose uptake, glycogen synthesis from glucose, and the key enzymes of glycogen metabolism, glycogen synthase (GS) and glycogen phosphorylase (GP), were analyzed. When exposed to anoxia, the nervous ganglia of the snail achieved a sustained glucose uptake and glycogen synthesis levels, which seems important to maintain neural homeostasis. However, the activities of GS and GP were reduced, indicating a possible metabolic depression in the CNS. During the aerobic recovery period, the enzyme activities returned to basal values. The possible strategies used by Megalobulimus abbreviatus CNS to survive anoxia are discussed.

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Seasonal variation of the carbohydrate and lipid metabolism in a land pulmonate gastropod, Megalobulimus oblongus

Cited by 26 publications

References 6 publications

Seasonal changes of energy reserves in Bulimulus tenuissimus (d'Orbigny, 1835) (Mollusca, Bulimulidae)

Seasonal changes of energy reserves in Bulimulus tenuissimus (d'Orbigny, 1835) (Mollusca, Bulimulidae)

Heart rate and body weight alterations in juvenile specimens of the tropical land snail Megalobulimus sanctipauli during dormancy

Control of carbohydrate metabolism in an anoxia‐tolerant nervous system

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