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Possible hybridization of Brazilian planorbid snails and its importance in population dynamics

Author(s): Mello-Silva Clélia Christina | Grault Carlos Eduardo | Costa Valdir Almeida da | Barbosa Frederico Simões

Journal: Memórias do Instituto Oswaldo Cruz
ISSN 0074-0276

Volume: 93;
Issue: suppl.1;
Start page: 227;
Date: 1998;
Original page

Keywords: schistosomiasis | Biomphalaria | hybridization

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.
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