Abstract
In this paper, we analyzed B chromosome variation in Korean field mouse Apodemus peninsulae Thomas 1907 (Rodentia, Muridae) based on a 40-year study of karyotypes collected from geographically distant populations in East Siberia, North Mongolia, China, the Russian Far East, and Japan (Hokkaido). We developed the database of individual variants of B chromosome systems in A. peninsulae. In Siberian populations all animals had Bs. The karyotypes of the studied animals contain from 1 to 30 Вs differing in size and morphology. Analysis of B chromosome systems in 598 individuals from different localities of the range shows the presence of 286 variants of Вs combinations in these animals. Unique sets of B morphotypes make up most of these variants (64.7 ± 1.3%), probably suggesting that individual Bs systems normally result from stochastic processes in the populations. The proportion of animals with a large number of Bs gradually decreases, probably due to increased complexities in the inheritance of large numbers of Bs. A. peninsulae is thus proposed as a good model for studying the origin and evolution of extra elements in the karyotype.
Highlights
The Korean field mouse (Apodemus peninsulae Thomas, 1907) is widely distributed from EastSiberia and North Mongolia, the Russian Far East to China, Korea, and Japan (Hokkaido) (Figure 1).A. peninsulae belongs to the genus Apodemus, in which six species have been shown to carryBchromosomes [1]
Lake region and Siberia (Central Siberia, Altai, Khakassia, Tyva, Baikal Lake region and Buryatia); 94 individuals were were collected from Primorsky krai
The analysis of 598 A. peninsulae karyotypes collected at 39 local populations in Russia, Mongolia, China, and Japan revealed presence of B chromosomes in 97.7% of the species population (Table 1)
Summary
The Korean field mouse (Apodemus peninsulae Thomas, 1907) is widely distributed from East. Korean field populations could have a highof variety of B chromosomes leading to onward of mouse [1,5,6,7,14,17,19,21,22,23,24,25,26]. Geographic variability of B morphotypes in the Korean field mouse [1,5,6,7,14,17,19,21,22,23,24,25,26]. Extensive database bdhromosomes-apodemus) and to analyze extra chromosome morphotypes in variousmorphotypes geographically (http://sev‐in.ru/ru/bdhromosomes‐apodemus) and to analyze extra chromosome in distant local populations.
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