Análise fisiológica da ação do látex de Euphorbia splendens var. hislopii n.e.b (Euphorbiaceae) sobre Biomphalaria glabrata Say, 1818 (Pulmonata, Planorbidae) infectada por Schistosoma mansoni Sambon, 1907 (Trematoda, Schistosomatidae), associada ao tempo de degradação do látex

Abstract

The Schistosomiasis is a parasitic diseases that have been take over importance in human and veterinary medicine. The snail Biomphalaria glabrata have the most important role like an intermediate host in Brazilian territory, due to its widespread geographic distribution. The World Health Organization stimulates this research of natural molluscicides, to decrease the impact of mollusk control at the environment and at the economy of the affected countries. This study aims to analyze the action of Euphorbia splendens var. hislopii latex on B. glabrata physiology infected by Schistosma mansoni associate to time of degradation of latex. So, the mollusks were exposed to aqueous solution of latex for 30 days, and then the alterations reproductive activity was observed. To analyze the physiological changes complementary studies were established, the first study during 36 hours and were divided in three parts of 12 hours. Another study was established during 35 days with 7 interval days. The latex exposition caused a reduction the total number of the egg and your viability, especially in exposed snails. The carbohydrate content was significantly altered, the glucose levels were increased at the same time when the glycogen level was reduced in the cephalopedal mass and in the digestive gland. The total protein in the hemolymph was significantly different when we compared exposed and unexposed snails. The nitrogenous of degradation products were also analyzed. The urea and uric acid content were inversely related, when the urea content were high in other hand the uric acid were low. We concluding the latex action was active during all days observed and it results in an alteration in reproductive biology and at the metabolic path ways for energy production. By the way, the stress caused for intoxication by latex plus the infection result in more significant different changes when compared exposed and the unexposed snails. The latex action was stronger at the snails infected by larval trematodes.