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Chromosomal polymorphism in siberian populations of the shrews of sorex araneus sorex arcticus complex insectivora soricidae 3. 3 chromosome forms of common shrew sorex araneus



Chromosomal polymorphism in siberian populations of the shrews of sorex araneus sorex arcticus complex insectivora soricidae 3. 3 chromosome forms of common shrew sorex araneus



Genetika 17(10): 1784-1791



The karyological analysis of common shrews S. araneus from 9 siberian populations was performed. Two levels of the chromosomal variability were established: intra and interpopulational. The intrapopulational chromosome variability is due to polymorphyisms for the centric translocations. Six pairs of autosomes were involved, though in every separate point the number of polymorphic pairs changed from 0-3. This process leads to a variation in the diploid number from 20-26. The interpopulational chromosome variability was detected by the analysis of the differentially stained chromosomes (G-method) and depended on different arm combinations in 5 pairs of biarmed chromosomes. The populations studied are divided into 3 chromosome forms delimited geographically, each of them being characterized by the definite patterns of the karyotype. The Novosibirsk, USSR, chromosome form differs in morphology of 4 autosome pairs from the Tomsk, USSR, form and in 5 pairs from the Ermakovo one. The latter differs from the Tomsk form by the arm apposition in 3 chromosome pairs. Four autosome pairs and heterochromosomes are identical for the pattern of the cross atriation in common shrews from both Siberian and West-European populations studied earlier. The detected interpopulational karyotypic peculiarities testify to the independence of the evolutional development of Siberian populations in the course of which different uniarm chromosomes were involved in the process of centric fusions. The cytogenetical distinctions are great and this fact casts doubt on the successful hybridization between these chromosome forms and raises a question of their taxonomic status.

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