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vol.93 suppl.1Molecular identification of similar species of the genus Biomphalaria (Mollusca: Planorbidae) determined by a polymerase chain reaction-restriction fragment length polymorphism author indexsubject indexarticles search
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Memórias do Instituto Oswaldo Cruz

Print version ISSN 0074-0276On-line version ISSN 1678-8060


MELLO-SILVA, Clélia Christina; GRAULT, Carlos Eduardo; COSTA, Valdir Almeida da  and  BARBOSA, Frederico Simões. Possible hybridization of Brazilian planorbid snails and its importance in population dynamics. Mem. Inst. Oswaldo Cruz [online]. 1998, vol.93, suppl.1, pp.227-232. ISSN 0074-0276.

This study focuses on the possibility of experimental hybridization among host snail species for Schistosoma mansoni in Brazil, with morphological characterization of the hybrids found. By using albinism as a genetic marker, intraspecific crossbreedings were performed between two strains of each species involved, in addition to interspecific crossbreedings; the only viable crossbreeding was between pigmented Biomphalaria glabrata (Paulista, PE) and albino B. tenagophila (Joinville, SC), with the formation of F1 and F2 generations. All offspring in F1 displayed black eyes and a renal ridge on the mantle, while F2 displayed dissociated morphological traits. With regard to reproduction, F1 was more efficient than F2. The experiment's results suggest post-zygotic reproductive isolation.

Keywords : schistosomiasis; Biomphalaria; hybridization.

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