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Hierarchical analyses of genetic differentiation in a hybrid zone of Sorex araneus (Insectivora: Soricidae)

Record type: Article

Microsatellites are used to unravel the fine-scale genetic structure of a hybrid zone between chromosome races Valais and Cordon of the common shrew (Sorex araneus) located in the French Alps. A total of 269 individuals collected between 1992 and 1995 was typed for seven microsatellite loci. A modified version of the classical multiple correspondence analysis is carried out. This analysis clearly shows the dichotomy between the two races. Several approaches are used to study genetic structuring. Gene flow is clearly reduced between these chromosome races and is estimated at one migrant every two generations using R-statistics and one migrant per generation using F-statistics. Hierarchical F- and R-statistics are compared and their efficiency to detect inter- and intraracial patterns of divergence is discussed. Within-race genetic structuring is significant, but remains weak. FST displays similar values on both sides of the hybrid zone, although no environmental barriers are found on the Cordon side, whereas the Valais side is divided by several mountain rivers. We introduce the exact G-test to microsatellite data which proved to be a powerful test to detect genetic differentiation within as well as among races. The genetic background of karyotypic hybrids was compared with the genetic background of pure parental forms using a CRT–MCA. Our results indicate that, without knowledge of the karyotypes, we would not have been able to distinguish these hybrids from karyotypically pure samples.

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Citation

Lugon-Moulin, N., Brunner, H., Wyttenbach, A., Hausser, J. and Goudet, J. (1999) Hierarchical analyses of genetic differentiation in a hybrid zone of Sorex araneus (Insectivora: Soricidae) Molecular Ecology, 8, (3), pp. 419-431. (doi:10.1046/j.1365-294X.1999.00595.x).

More information

Published date: March 1999
Keywords: common shrew, exact test, genetic differentiation, hybrid zone, microsatellite, multivariate analysis

Identifiers

Local EPrints ID: 56643
URI: http://eprints.soton.ac.uk/id/eprint/56643
ISSN: 0962-1083
PURE UUID: ac1db6c8-c0fb-44c3-a7b5-c86335dfa64c

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Date deposited: 22 Aug 2008
Last modified: 17 Jul 2017 14:30

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Contributors

Author: N. Lugon-Moulin
Author: H. Brunner
Author: A. Wyttenbach
Author: J. Hausser
Author: J. Goudet

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