The vole Alexandromys evoronensis (Kovalskaya et Sokolov, 1980) with its two chromosomal races, “Evoron” (2n = 38–41, NF = 54–59) and “Argi” (2n = 34, 36, 37, NF = 51–56) is the endemic vole found in the Russian Far East. For the “Argi” chromosomal race, individuals from two isolated populations in mountain regions were investigated here for the first time using GTG-, GTC-, NOR methods. In the area under study, 8 new karyotype variants have been registered. The karyotype with 2n = 34 has a rare tandem fusion of three autosomes: two biarmed (Mev6 and Mev7) and one acrocentric (Mev14) to form a large biarmed chromosome (Mev6/7/14), all of which reveal a heterozygous state. For A. evoronensis, the variation in the number of chromosomes exceeded the known estimate of 2n = 34, 36 and amounted to 2n = 34, 36, 38–41. The combination of all the variations of chromosomes for the species made it possible to describe 20 variants of the A. evoronensis karyotype, with 11 chromosomes being involved in multiple structural rearrangements. In the “Evoron” chromosomal race 4 chromosomes (Mev1, Mev4, Mev17, and Mev18) and in the “Argi” chromosomal race 9 chromosomes (Mev6, Mev7, Mev14, Mev13, Mev11, Mev15, Mev17, Mev18, and Mev19) were observed. Tandem and Robertsonian rearrangements (Mev17/18 and Mev17.18) were revealed in both chromosomal races “Evoron” and “Argi”.

中文翻译：

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种内多种染色体变异，包括俄罗斯远东特有的埃沃隆田鼠 Alexandromys evoronensis（啮齿目、Arvicolinae）中罕见的串联融合

田鼠 Alexandromys evoronensis (Kovalskaya et Sokolov, 1980) 及其两个染色体种族，“Evoron”（2n = 38–41，NF = 54–59）和“Argi”（2n = 34, 36, 37，NF = 51– 56）是俄罗斯远东地区发现的特有田鼠。对于“Argi”染色体种族，首次使用 GTG-、GTC-、NOR 方法对来自山区两个孤立种群的个体进行了研究。在该研究领域，已登记了 8 个新的核型变异。2n = 34 的核型具有罕见的三个常染色体串联融合：两个双臂（Mev6 和 Mev7）和一个近端着丝粒（Mev14），形成一个大的双臂染色体（Mev6/7/14），所有这些都显示出杂合状态。对于 A. evoronensis，染色体数量的变异超出了已知的估计值 2n = 34, 36，达到 2n = 34, 36, 38–41。该物种所有染色体变异的组合使得描述埃沃罗尼西斯核型的 20 种变体成为可能，其中 11 条染色体参与多种结构重排。在“Evoron”染色体种族中，4条染色体（Mev1、Mev4、Mev17和Mev18）和在“Argi”染色体种族中，9条染色体（Mev6、Mev7、Mev14、Mev13、Mev11、Mev15、Mev17、Mev18和Mev19）是观察到的。在“Evoron”和“Argi”两个染色体种族中都揭示了串联和罗伯逊重排（Mev17/18 和 Mev17.18）。