Cytotaxonomic analysis of species of the genera Mus, Apodemus and Rattus in Azerbaijan

Publication Type:Journal Article
Year of Publication:1991
Authors:Bulatova, NSh, Nadjafova, RS, Kozlovsky, I
Journal:Journal of Zoological Systematics and Evolutionary Research
Volume:29
Date Published:1991
ISBN Number:1439-0469
Keywords:Rattus norvegicus
Abstract:

The methods of G-, C- and Ag-staining of chromosomes and restaining of the same preparations by various techniques were used for karyological studies of mice and rats in Azerbaijan. Despite the seemingly stable karyotypes (2n # 40, 2n = 48 respecitively) respresentatives of the genera Mas and Apodemus exhibited karyotypic differences indicating that the traditional species in either case were represented by various forms. Two different cytotypes showing the differentiation of two taxonomic groups (presumably species) were observed in Transcaucasian Mus. In the present paper they are termed as “musculus-” and “abbotti”-cytotypes. Three karyotypic forms having various locations of NOR's were established in the subgenus Sylvimus of the genus Apodemus. At the same time we failed to obtain the cytogenetic proof of presence of the European cytotype of the yellow-necked mouse (Apodemus flavicollis) in this region. This result automatically removes the problem of interspecific hybridization of A. sylvaticus and A. flavicollis, which was repeatedly discussed in the literature. The cytogenetic study of a Transcaucasian population revealed a system of intraspecific karyotype variation in A. agrarius. For the intra-specific chromosomal polymorphism observed in the chromosome pairs 3, 11 and 12 of Rattus norvegicus our data support the view that variations of heterochromatic and nucleolus organizing regions rather than pericentric inversions are responsible for it. Wild rats (R. rattus) from an endemic Talysh population showed the normal 38-chromosome karyotype. Zusammenfassung

URL:http://dx.doi.org/10.1111/j.1439-0469.1991.tb00453.x
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