Population structure and genetic diversity in the invasive freshwater snail Galba schirazensis (Lymnaeidae)

Abstract : We studied the population genetic structure of the freshwater snail Galba schirazensis (Küster, 1862), a potential vector of infectious diseases such as fascioliasis. Galba schirazensis has now a worldwide distribution but a poorly known origin because this species has been distinguished only recently from the morphologically similar and cosmopolitan Galba truncatula (O.F. Müller, 1774).Wedevelopedspecificmicrosatellitemarkersandsequencedamitochondrialgene(cytochromeoxidasesubunitI(CO1))tostudy individuals of G. schirazensis from the Old World and the New World. We found very low genetic diversity within populations, no heterozygotes,andmarkedpopulationstructure—apatternobservedinotherhighlyselfinglymnaeidspecieswithrecentlyenlarged distributions as a result of biological invasions. The total lack of observed heterozygosity in the few populations of G. schirazensis that displayedsomeallelicdiversitysuggestshighselfingrates.Wealsofoundthatthecenterofdiversity,andbyextensiontheoriginarea of this species, should be found in the New World, whereas Old World populations should rather result from a recent introduction of a genetically uniform population. The microsatellite markers developed here will help to clarify the history of expansion of G. schirazensis and might help to understand its role as a potential vector of infectious diseases.
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Submitted on : Wednesday, December 12, 2018 - 4:43:52 PM
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  • HAL Id : hal-01953197, version 1


M. Lounnas, A.C. Correa, P. Alda, P. David, M. Dubois, et al.. Population structure and genetic diversity in the invasive freshwater snail Galba schirazensis (Lymnaeidae). Canadian Journal of Zoology, NRC Research Press, 2018, 96 (5), pp.425-435. ⟨hal-01953197⟩



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