Microspatial genetic structure in the land snail Helix aspersa (Gastropoda: Helicidae)

被引：30

作者：

Arnaud J.-F. ^{[1
,2
]}

Madec L. ^{[1
]}

Bellido A. ^{[3
]}

Guiller A. ^{[2
]}

机构：

[1] UMH CNRS 6553, Serv. de Zool. et d'Ecophysiologie, Université de Rennes I, 35042 Rennes Cedex

[2] UMR CNRS 6553, Serv. de Parasitol. Pharmaceutique, Université de Rennes I, 35043 Rennes Cedex, Avenue du Pr. Léon Bernard

[3] UMR CNRS 6553, Serv. d'Ecologie Sol Biol. P., Station Biologique de Paimpont

来源：

Heredity | 1999年 / 83卷 / 2期

关键词：

Allozymes; F-statistics; Genetic structure; Land snail; Metapopulation; Spatial autocorrelation;

D O I：

10.1046/j.1365-2540.1999.00565.x

中图分类号：

学科分类号：

摘要：

The microspatial genetic structure of allele frequencies at seven isozyme loci was examined for 15 populations of the land snail Helix aspersa sampled in a village from Brittany (north-western France). Spatial heterogeneity of allele frequencies was highly significant (P < 0.001). Fixation indices reflected nonrandom mating within neighborhoods and a slight but consistent differentiation between colonies (F(ST) = 0.044; P < 0.01). Analyses of gene flow or genetic distances failed to reveal a significant relationship with geographical distance, probably because of the complexity of environmental heterogeneity. However, matrix comparisons between genetic distances and connectivity networks among adjacent colonies (Gabriel-connected graph) yielded a significant correlation in every case, indicating a 'step-by-step' relationship between neighboring localities. Moreover, most of the allozymes were spatially structured and showed (i) a gradual isolation of colonies with increasing geographical distances, and (ii), for some correlogram profiles, a circular gradient illustrating a multidirectional colonization of the village. The probable existence of disperser individuals allowed us to suggest a metapopulation model which would explain the maintenance of such animals in fragmented habitats where anthropogenic disturbances and extinction/recolonization events are commonly observed.

引用

页码：110 / 119

页数：9

共 35 条

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