Behaviour of albino and melanic variants of Biomphalaria glabrata Say, 1818 (Mollusca: Planorbidae) following infection by Schistosoma mansoni Sambon, 1907

Brazilian Journal of Biology

Sm. Allegretti²  Jf. Carvalho¹  La. Magalhães²  Em. Zanotti-magalhães² 

[1] ,Universidade Estadual de Campinas Instituto de Biologia Departamento de ParasitologiaCampinas SP ,Brazil

关键词: Biomphalaria glabrata;    amoebocytes;    Schistosoma mansoni;    sporocysts;    Biomphalaria glabrata;    amebócitos;    Schistosoma mansoni;    esporocistos;   

DOI  :  10.1590/S1519-69842009000100029

来源: SciELO

【 摘 要 】

The behaviour of the albino and melanic variants of Biomphalaria glabrata of Belo Horizonte (MG. Brazil) was studied comparatively, in terms of their respective susceptibilities to infection by Schistosoma mansoni of the same origin, through observation of the elimination of cercariae for a three-month period and the calculation of mortality and infection rates, in control and in infected snails. The number of amoebocytes, granulocytes and hyalinocytes in the circulating hemolymph during different periods of infection was analyzed. The evolution of the infection in the tissues was observed by means of histological cross-sections. The melanic variant showed greater susceptibility to infection and a higher mortality rate. The albino variant showed a higher number of circulating amoebocytes, both granulocytes and hyalinocytes. A higher number of degenerated sporocysts were seen in the histological cross-sections of the albino variant. The results suggest that the melanic variant of B. glabrata was more susceptible to infection by S. mansoni than was the albino variant.

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