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- W2183157074 abstract "Previously published mtDNA sequence data have suggested that an undescribed species of Physa (“Species A”) may inhabit the swamps and ditches in the southeastern Atlantic coastal plain. These snails are characterized by slender shells and dark bodies, but are otherwise similar to the more widely distributed P. pomilia. Mate choice tests revealed significant sexual isolation between Species A and P. pomilia, with homogametic pairings of P. pomilia five times more frequent than heterogametic. A set of no-choice outcross experiments yielded only self-fertilized progeny from the Species A parent and reproductive failure from the pomilia parent, suggesting complete Species A x pomilia hybrid inviability. The third species of Physa inhabiting South Carolina, P. acuta, is more genetically similar to Species A but bears a distinctive penial anatomy. Mate choice tests uncovered no evidence of sexual isolation between Species A and P. acuta, and hybridization occurred readily, with some reduction in parental fecundity but normal F1 viability. Species A acuta F1 hybrids appear, however, to be 100% sterile. Thus, the relationship between the degree of reproductive isolation and genetic divergence seems to be stronger than that between reproductive isolation and penial anatomy in the physid snails of South Carolina. Physa Species A warrants formal description." @default.
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- W2183157074 date "2009-01-01" @default.
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- W2183157074 title "Empirical estimates of reproductive isolation among the Physa species of South Carolina (Gastropoda: Pulmonata: Basommatophora)" @default.
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