Genetic relationships among suspected contact zone populations of helix aspersa (gastropoda: pulmonata) in algeria

ABSTRACT In Maghreb, the land snail _Helix aspersa_ consists of two anatomically and biochemically divergent groups of populations between which the separation occurs roughly to the east of

the Lesser Kabylia. To document the patterns of migration across the suspected contact zone between these two geographical entities, we have analysed changes in allele frequencies at 13

polymorphic allozyme loci in five intermediate Algerian populations ranging from Azeffoun (Great Kabylia) to El Hedaick (Skikda), thus including three western and two eastern colonies.

Multivariate analyses and exact tests for population differentiation were used to show the genetic divergence between samples; deviations from panmixia were calculated to account for the

effect of migration. Whereas some loci showed abrupt changes in allelic composition across the hybrid zone, some others were introgressed, especially into eastern populations in the central

colony of Djemila. It is tempting to ascribe this allelic distribution to gene exchanges between populations on the east and west. However, the large number of private alleles found in

adjoining populations apparently does not support this explanation, although such an increase in rare alleles has been observed in other hybrid zone surveys. In addition, it may be that this

discrepancy between the patterns of common and private allele variation may result from the time since contact occurred. Whatever the explanation of this finding, the genetic structure in

Djemila, and particularly the large linkage disequilibria observed, indicates population mixing. Although not ruling out the possibilities of tectonic events and of human transport, the most

likely hypothesis for contacts between eastern and western populations are that these result from climatic phenomena during the Quaternary. SIMILAR CONTENT BEING VIEWED BY OTHERS POPULATION

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Download references AUTHOR INFORMATION AUTHORS AND AFFILIATIONS * Laboratoire de Parasitologie Pharmaceutique (CNRS URA 1853), Université de Rennes I, Avenue du Pr. Léon Bernard, Rennes,

35043, France Annie Guiller * Laboratoire de Zoologie et d'Ecophysiologie (INRA-CNRS URA 1853), Université de Rennes I, Avenue du General Leclerc, Rennes, 35042, France Marie-Agnès

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PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Guiller, A., Coutellec-Vreto, MA. & Madec, L. Genetic relationships among suspected contact zone populations of

_Helix aspersa_ (Gastropoda: Pulmonata) in Algeria. _Heredity_ 77, 113–129 (1996). https://doi.org/10.1038/hdy.1996.116 Download citation * Received: 05 July 1995 * Issue Date: 01 August

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not currently available for this article. Copy to clipboard Provided by the Springer Nature SharedIt content-sharing initiative KEYWORDS * allozymes * contact zone * genetic structure *

_Helix aspersa_ * Maghreb * postglacial expansion