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Small effective population sizes in a widespread selfing species, Lymnaea truncatula (Gastropoda: Pulmonata)
Author(s) -
MEUNIER C.,
HURTREZBOUSSES S.,
DURAND P.,
RONDELAUD D.,
RENAUD F.
Publication year - 2004
Publication title -
molecular ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.619
H-Index - 225
eISSN - 1365-294X
pISSN - 0962-1083
DOI - 10.1111/j.1365-294x.2004.02242.x
Subject(s) - pulmonata , biology , gastropoda , selfing , lymnaea , population , ecology , zoology , snail , demography , sociology
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.