Changes in energetic metabolism of Biomphalaria glabrata (Mollusca, Planorbidae) in response to exogenous calcium

Abstract

Calcium is considered an essential element for the metabolism of aquatic snail Biomphalaria glabrata (Say, 1818), intermediate host of Schistosoma mansoni Sambon, 1907 in Brazil, and represents a limiting factor to its distribution and adaptation to the environment. This study investigated the effect of different concentrations of exogenous CaCO 3 on the energetic metabolism of B. glabrata for better understanding the physiological interference of chemical elements dissolved in the environment with the physiology of this species. Sixty-day-old snails were distributed into six groups, five exposed to different concentrations of CaCO 3 (20, 40, 60, 80 and 100 mg/L) and a control group. The exposure to CaCO 3 was assessed over time, with analysis of 15 snails of each group in the following intervals: 1, 14, 21 or 30 days for hemolymph extraction. Concentrations of calcium and glucose in the hemolymph were determined by commercial kits, and organic acids were extracted using an ion exchange column and analyzed by high-performance liquid chromatography. Concentration of calcium in the hemolymph showed no significant difference (p>0.05) from the control group and between the concentrations tested. Concentration of glucose decreased (p<0.05) in the treatments of exposure to 20 and 40 mg/L and increased when exposed to 80 and 100 mg/L CaCO 3 compared to control and to other concentrations tested over 30 days. The organic acids pyruvate, oxaloacetate, citrate, succinate, fumarate, beta-hydroxybutyrate and lactate presented increased concentrations, while propionate and acetoacetate, decreased concentrations, when exposed to CaCO 3 compared to control. Considering the influence of different periods of exposure to CaCO 3 , on the 14 th day, there were stronger alterations in the metabolism of B. glabrata. In conclusion, exposure to CaCO 3 reduced the concentration of glucose, which is metabolized into pyruvate, the final product of glycolysis, and also influenced the energetic metabolism pathways, indicating an aerobic or partially anaerobic functioning.Keywords: snails, Krebs cycle, CaCO 3 exposure, energetic metabolism. (20, 40, 60, 80 e 100mg/L) e um controle. A exposição ao CaCO 3 foi avaliada em função do tempo, sendo retirados 15 moluscos de cada grupo nos seguintes intervalos: 1, 14, 21 ou 30 dias para extração da hemolinfa. As concentrações de cálcio e glicose na hemolinfa foram determinadas usando-se kits comercial e os ácidos orgânicos foram extraídos por meio da coluna de troca iônica e analisados através cromatografia líquida Alterações no metabolismo energético deBraz.

Feasibility of near-infrared spectroscopy for species identification and parasitological diagnosis of freshwater snails of the genus Biomphalaria (Planorbidae)

“…tenagophila and the possible potential for hybridization [ 23 , 30 ]. Considering that the shells composition reflects the metabolic projections of the animal, it was expected that the three species could be differentiated using the shells alone, possibly associated with the chemical and protein arrangement of the organic matrix of the shells of these animals [ 26 , 28 , 31 ].…”

Hemolymph of molluscan origin: from biochemistry to modern biomaterials science

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Alterations in lipids and minerals in relation to larval trematode infections of Nerita polita marine snails

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