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Titolo: Microspatial genetic structure in the land snail Helix aspersa (Gastropoda: Helicidae)
Autore: Arnaud, JF; Madec, L; Bellido, A; Guiller, A;
- Indirizzi:
- Univ Rennes 1, Serv Zool & Ecophysiol, CNRS, UMR 6553, F-35042 Rennes, France Univ Rennes 1 Rennes France F-35042 RS, UMR 6553, F-35042 Rennes, France Stn Biol Paimpont, Serv Ecol Sol & Biol Populat, CNRS, UMR 6553, F-35380 Plelan Le Grand, France Stn Biol Paimpont Plelan Le Grand France F-35380 Plelan Le Grand, France Univ Rennes 1, Serv Parasitol Pharmaceut, CNRS, UMR 6553, F-35043 Rennes, France Univ Rennes 1 Rennes France F-35043 RS, UMR 6553, F-35043 Rennes, France
- Titolo Testata:
- HEREDITY
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volume: 83,
anno: 1999,
parte:, 2
pagine: 110 - 119
- SICI:
- 0018-067X(199908)83:<110:MGSITL>2.0.ZU;2-G
- Fonte:
- ISI
- Lingua:
- ENG
- Soggetto:
- SPATIAL-AUTOCORRELATION ANALYSIS; AUTO-CORRELATION ANALYSIS; POPULATION-STRUCTURE; DISTANCE; PULMONATA; FLOW; DIFFERENTIATION; STATISTICS; PATTERNS; BIOLOGY;
- Keywords:
- allozymes; F-statistics; genetic structure; land snail; metapopulation; spatial autocorrelation;
- Tipo documento:
- Article
- Natura:
- Periodico
- Settore Disciplinare:
- Agriculture,Biology & Environmental Sciences
- Life Sciences
- Citazioni:
- 35
- Recensione:
- Indirizzi per estratti:
- Indirizzo: Arnaud, JF Univ Rennes 1, Serv Zool & Ecophysiol, CNRS, UMR 6553, Campus de Beauliue,Ave Ga Leclerc, F-35042 Rennes, France Univ Rennes 1 Campus de Beauliue,Ave Ga Leclerc Rennes France F-35042
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- Citazione:
- J.F. Arnaud et al., "Microspatial genetic structure in the land snail Helix aspersa (Gastropoda: Helicidae)", HEREDITY, 83, 1999, pp. 110-119
Abstract
The microspatial genetic structure of allele frequencies at seven isozyme loci was examined for 15 populations of the land snail Helix aspersa sa 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 neighbourhoods and a slight but consistent differentiation between colonies (F-ST = 0.044; P < 0.01). Analyses ofgene flow or genetic distances failed to reveal a significant relationshipwith 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 neighbouring 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.
ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 17:05:28