Karyotype of Microtus fortis (Rodentia, Cricetidae) from extreme south of Far East Russia

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We examined karyotype of 9 reed voles, Microtus fortis, collected from extreme-southern part of Primorsky territory. All animals had 2n=52, but we found polymorphism in No. 7 pair with homomorphic acrocentric (A/A), heteromorphic acrocentric and subtelocentric (A/ST), or homomorphic subtelocentric (ST/ST) type. The karyotype with heteromorphic No. 7 pair (A/ST) was the first report in this species, suggesting that reed voles with A/ST No. 7 pair were developed by hybridization between voles with A/A and ST/ST type No. 7 chromosomes, and that reed voles in the extreme-southern Primorsky territory were mixed population with the three types of polymorphic No. 7 pair. Centromeric C-bands appeared in 13-15 acrocentric pairs in which 6 had telomeric heterochromatic segments. Biarmed chromosomes were C-band negative. The X chromosome had centromeric heterochromatin and the Y chromosome was entirely heterochromatic.
財団法人染色体学会の論文