CHROMOSOME MORPHOTYPES OF APODEMUS PENINSULAE (RODENTIA)
FROM THE RUSSIAN FAR EAST
G.V. Roslik, I.V. Kartavtseva
Institute of Biology and Soil Science, Far Eastern Branch of RAS, Vladivostok;
e-mail: roslik_g@mail.ru, irina-kar52@rambler.ru
Polymorphism of  chromosome morphotypes in the natural populations of the Korean field mouse Apodemus
peninsulae (n = 367) has been studied in five regions of the Russian Far East: Magadan and Amur regions,
the Jewish Autonomous region, Khabarovsk and Primorskii regions. Six groups of  chromosome morphotypes
have been described on the size and morphological parameters. On the basis of their combinations 78 cell clones
have been revealed, 23 of which are found in the animals with a stable karyotype and 76 — in mosaics. The
mosaics have also more diverse and unique combinations of  chromosome morphotypes. No differences between
the geographic and local populations of mice on the studied characteristics have been found. Homogeneous
structure of DNA in the  chromosomes of t h i s species at the territory of the Russian Far East, as shown
previously, allowed us to combine the numerical and dimensional data for each clone by introduction conditional
«mass quantity» of  chromosomes (mB index). The leading role of natural selection in production of «critical
» mass of supernumerary chromosomes in individuals with a stable karyotype and the weakening of its role in
mosaics has been suggested.
Key words: Â chromosomes, morphotypes, Apodemus peninsulae, mosaics, mB index
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