Population genetic structure in a human-disturbed environment: a case study in the land snail Helix aspersa (Gastropoda: Pulmonata).

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

Heredity

authors

Arnaud JF,Madec L,Guiller A,Deunff J

doi

10.1038/sj.hdy.6800256

keywords:

subject

Has Abstract

pub_date

2003-06-01 00:00:00

pages

451-8

issue

6

eissn

0018-067X

issn

1365-2540

pii

6800256

journal_volume

90

pub_type

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