Possible Hybridization of Brazilian Planorbid Snails and its Importance in Population Dynamics

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 spe...

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Bibliographic Details
Published in:Memórias do Instituto Oswaldo Cruz 1998-01, Vol.93 (suppl 1), p.227-232
Main Authors: Clélia Christina Mello-Silva, Carlos Eduardo Grault, Valdir Almeida da Costa, Frederico Simões Barbosa
Format: Article
Language:English
Subjects:
Albinism - genetics
Animals
Biomphalaria
Biomphalaria - genetics
Brazil
Crosses, Genetic
Female
Fertility - genetics
Genetic Markers
hybridization
Hybridization, Genetic
Male
PARASITOLOGY
Phenotype
Population Dynamics
schistosomiasis
schistosomiasis - Biomphalaria - hybridization
TROPICAL MEDICINE
Zygote
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Summary: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.
ISSN:1678-8060
0074-0276
0074-0276
1678-8060
DOI:10.1590/S0074-02761998000700040