TITLE

Comparison between shell morphology and genetic diversity in two sympatric lymnaeid snails, vectors of fasciolosis

AUTHOR(S)
Hurtrez-Boussès, S.; Pendino, A.; Barnabé, C.; Durand, P.; Rondelaud, D.; Durand, C.; Meunier, C.; Hurtrez, J.-E.; Renaud, F.
PUB. DATE
December 2005
SOURCE
Canadian Journal of Zoology;Dec2005, Vol. 83 Issue 12, p1643
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Species determination of freshwater snails is particularly important in the case of disease vectors. In central France, for example, it has been shown that Galba truncatula (Müller, 1774) and Omphiscola glabra (Müller, 1774), which can be found in sympatry, are intermediate hosts for fasciolosis. Although these two species are distinguishable based on their shell morphology, some snails present in sympatric zones possess shell characteristics that are common to both species, suggesting possible gene flow. To test this hypothesis, we carried out multilocus enzyme electrophoreses on individuals sampled in one zone of sympatry. Our results clearly show that all snails with shell characteristics common to both species are O. glabra. We also note an absence of hybridization between G. truncatula and O. glabra in the study area. Remarkably, we observe a total monomorphism at the six studied loci among individuals of G. truncatula. Similarly, we find a total lack of heterozygotes in the O. glabra sample (with classic or intermediate shell characteristics). These results suggest a predominance of selfing in the reproductive mode of both species. Our results suggest that conchological characteristics can provide information about the taxonomic position of lymnaeids. However, they are insufficient to confidently differentiate species.
ACCESSION #
19420146

 

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