Distribution of two karyotypic races of Sorex araneus (Insectivora, Soricidae) in Switzerland and the post-glacial recolonization of the Valais: First results

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Abstract
Two chromosome races of Sorex araneus were found in southern and western Switzerland. It is suggested they were issued by introgression of different sets of metacentrics, coming respectively from north-east and south, into a primitive “acrocentric” population which recolonized the country from the west after the last glaciation.