Genetic structuring and gene flow in a hybrid zone between two chromosome races of the common shrew (Sorex araneus, Insectivora) revealed by microsatellites
Genetic structuring and gene flow in a hybrid zone between two chromosome races of the common shrew (Sorex araneus, Insectivora) revealed by microsatellites
Hybrid zones between chromosome races are of interest because they offer the opportunity to investigate the role of chromosomes in speciation processes. Here we study gene flow and fine-scale genetic structure of a chromosome hybrid zone in the common shrew (Sorex araneus, Insectivora, Mammalia) in central Sweden using six polymorphic microsatellite loci. The centre of the hybrid zone closely follows a river towards which race-specific chromosomes sharply decrease suggesting a physical barrier to introgression. We examined 285 animals from 22 different localities and performed a hierarchical analysis for F and R statistics. Genetic structuring within and between the two chromosome races (Hällefors and Uppsala) was found to be weak, but significant. No positive relationship between geographical and genetic distance was detected, suggesting the absence of isolation by distance. Gene flow between the races is not reduced. Therefore, it does not seem that the river is an important barrier reducing introgression between races. The fact that the width of the hybrid zone is narrow and that its centre follows the river despite high levels of migration is discussed.
common shrew, gene flow, genetic structure, hybrid zone, microsatellites, sorex araneus
79-88
Wyttenbach, A.
69846a0f-fb60-4a28-84eb-ed865a5e31fa
Narain, Y.
250fa42a-e4c0-4b7d-8593-4c89236acd73
Fredga, K.
395d768f-cd35-4c9a-b791-22eb92571bde
1 January 1999
Wyttenbach, A.
69846a0f-fb60-4a28-84eb-ed865a5e31fa
Narain, Y.
250fa42a-e4c0-4b7d-8593-4c89236acd73
Fredga, K.
395d768f-cd35-4c9a-b791-22eb92571bde
Wyttenbach, A., Narain, Y. and Fredga, K.
(1999)
Genetic structuring and gene flow in a hybrid zone between two chromosome races of the common shrew (Sorex araneus, Insectivora) revealed by microsatellites.
Heredity, 82, .
(doi:10.1038/sj.hdy.6884520).
Abstract
Hybrid zones between chromosome races are of interest because they offer the opportunity to investigate the role of chromosomes in speciation processes. Here we study gene flow and fine-scale genetic structure of a chromosome hybrid zone in the common shrew (Sorex araneus, Insectivora, Mammalia) in central Sweden using six polymorphic microsatellite loci. The centre of the hybrid zone closely follows a river towards which race-specific chromosomes sharply decrease suggesting a physical barrier to introgression. We examined 285 animals from 22 different localities and performed a hierarchical analysis for F and R statistics. Genetic structuring within and between the two chromosome races (Hällefors and Uppsala) was found to be weak, but significant. No positive relationship between geographical and genetic distance was detected, suggesting the absence of isolation by distance. Gene flow between the races is not reduced. Therefore, it does not seem that the river is an important barrier reducing introgression between races. The fact that the width of the hybrid zone is narrow and that its centre follows the river despite high levels of migration is discussed.
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Published date: 1 January 1999
Keywords:
common shrew, gene flow, genetic structure, hybrid zone, microsatellites, sorex araneus
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Local EPrints ID: 56175
URI: http://eprints.soton.ac.uk/id/eprint/56175
ISSN: 0018-067X
PURE UUID: 199a8401-e15b-4b71-b5e9-ea45643f352a
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Date deposited: 08 Aug 2008
Last modified: 15 Mar 2024 11:00
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Author:
A. Wyttenbach
Author:
Y. Narain
Author:
K. Fredga
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