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- Title
Small effective population sizes in a widespread selfing species, Lymnaea truncatula (Gastropoda: Pulmonata).
- Authors
Meunier, C.; Hurtrez-Bousses, S.; Durand, P.; Rondelaud, D.; Renaud, F.
- Abstract
We present here a spatial and temporal population genetic survey of a common freshwater snail, also a predominantly selfing species, Lymnaea truncatula. The rate of genetic diversity loss was quantified by estimating the effective size ( N e) of the snail populations, using two different methods. A temporal survey allowed estimation of a variance effective size of the populations, and a spatial survey allowed the estimation of an inbreeding effective size, from two-locus identity disequilibria estimates. Both methods were consistent and provided low N e values. Drift due to (i) high amounts of selfing and (ii) fluctuations in population sizes because of temporary habitats, and also selection coupled to genome-wide linkage disequilibria, could explain such reductions in N e. The loss of genetic diversity appears to be counterbalanced only very partially by low apparent rates of gene flow.
- Subjects
GALBA truncatula; GALBA; GASTROPODA; POPULATION genetics; GENETICS; POPULATION
- Publication
Molecular Ecology, 2004, Vol 13, Issue 9, p2535
- ISSN
0962-1083
- Publication type
Article
- DOI
10.1111/j.1365-294X.2004.02242.x