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The Journal of Heredity 1989:80(4):284-290
© 1989 The American Genetic Association 80:284-290

research-article

Phylogenetic Relationships of the Sorex araneus–arcticus Species Complex (Insectivora, Soricidae) Based on High-Resolution Chromosome Analysis

V. T. Volobouev

Généetique Ecologique E.P.H.E., University of Montpellier France Dr. Volobouev is now at Structure et Mutagénèse Chromosomiques, Institut Curie Paris,France.

Address reprint requests to Dr. Volobouev, Structure et Mutagénèse Chromosomiques, Institut Curie, Pavillon Regaud, 26, rue d'Ulm, 75231 Paris Cedex 05, France

Abstract

High-resolution chromosome analysis of four species of the Sorex araneus–arcticus complex (Insectivora, Soricidae), namely S. granarius, S. araneus, S. coronatus, and S. arcticus, revealed that their karyotypes are composed of the same original chromosome material that may have been present in chromosomes of S. granarius. The karyotypes of the other three species could have been derived from that of S. granarius by means of three types of chromosomal rearrangements: Robertsonian translocations, telomere–centromere translocations, and centromeric shifts. These types of rearrangements imply that the direction of chromosomal evolution in these species has been from high to low chromosome numbers. It is supposed that this reconstructed scheme of chromosomal evolution reflects the phylogenetic relationships among the species of the araneus–arcticus complex that were studied.


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