Abstract
The data on the changes in the cytogenetic structure of the geographic population of Korean field mouse Apodemus (Alsomys) peninsulae Thomas, 1907 at the southern shore of the Teletskoye Lake (Altai Republic) are presented. In 1980 no dot-like microchromosomes were found in 34 mice captured on the southern and northern coasts of the Teletskoye Lake. In 2011, a 1.6-fold (from 2.7 to 4.3) increase in the mean number of B chromosomes compared to the rate estimated there earlier in 1980 was discovered. In 11 of the 15 mice (73%) captured in 2011, the karyotypes contained 1–2 dot-like micro B chromosomes and 1–5 macro B chromosomes. The pollution of the territory by the remains of the rocket fuel components may be an appropriate explanation for the cause of the karyological changes observed in A. peninsulae in this region.
Highlights
The story of studying and describing B chromosomes (Bs) dates back to 1907, when Edmund Wilson (1907), working on hemipteran chromosomes, noticed those that appeared to be additional to the main karyotype and were present only in a fraction of individuals
In 1928, Lowell Fitz Randolph working on variation in maize chromosomes proposed to call stable chromosomes of the standard complement ‘A chromosomes’, and those coming additional to the standard complement and being variable in number and morphology, ‘B chromosomes’ (Randolph 1928)
B chromosomes have been reported in six species of the genus Apodemus (A. peninsulae Thomas, 1907, A. agrarius Pallas, 1771, A. sylvaticus Linnaeus, 1758, A. flavicollis Melchior, 1834, A. mystacinus Danford & Alston, 1877, A. argenteus Temminck, 1844)
Summary
The story of studying and describing B chromosomes (Bs) dates back to 1907, when Edmund Wilson (1907), working on hemipteran chromosomes, noticed those that appeared to be additional to the main karyotype and were present only in a fraction of individuals. Keywords Apodemus (Alsomys) peninsulae, B chromosome dynamics, dot-like micro B chromosomes, karyotype Earlier (Borisov and Zhigarev 2018), we analyzed B chromosome variation in Korean field mouse Apodemus peninsulae (Rodentia, Muridae) based on a 40-year study of karyotypes collected from geographically distant populations in East Siberia, North Mongolia, China and the Russian Far East.
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