Abstract:
:Local patterns of genetic variation were analysed in the land snail Helix aspersa for 32 populations sampled within a patchy agricultural landscape: the polders of the Bay of Mont-Saint-Michel (France). This investigation examined the allele frequencies at four enzymatic markers and five microsatellite loci through the genotyping of 580 individuals. A strongly significant population genetic substructuring (mean F(ST)=0.088, P<0.001) was found at the scale of the whole polders area (3050 ha) and both categories of markers displayed a similar magnitude of spatial genetic differentiation. We did not find any obvious effects of habitat fragmentation on the distribution of genetic variability. Despite the reality of habitat patchiness and environmental instability (related to farming practices), an isolation by distance process was clearly depicted, although selective pressures cannot be ruled out for one enzymatic locus. Overall, genetic drift, along with occasional long-distance episodes of gene flow, was presumably the most likely evolutionary force that shaped the observed pattern of genetic variation.
journal_name
Heredity (Edinb)journal_title
Heredityauthors
Arnaud JF,Madec L,Guiller A,Deunff Jdoi
10.1038/sj.hdy.6800256keywords:
subject
Has Abstractpub_date
2003-06-01 00:00:00pages
451-8issue
6eissn
0018-067Xissn
1365-2540pii
6800256journal_volume
90pub_type
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