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Masaharu Motokawa, 吴毅, Masashi Harada, Yuta Shintaku, 蒋学龙, 李玉春. 2018: 中国姬鼠属的核型研究. 动物学研究, 39(5): 348-355. DOI: 10.24272/j.issn.2095-8137.2018.054
引用本文: Masaharu Motokawa, 吴毅, Masashi Harada, Yuta Shintaku, 蒋学龙, 李玉春. 2018: 中国姬鼠属的核型研究. 动物学研究, 39(5): 348-355. DOI: 10.24272/j.issn.2095-8137.2018.054
Masaharu Motokawa, Yi Wu, Masashi Harada, Yuta Shintaku, Xue-Long Jiang, Yu-Chun Li. 2018: Karyotypes of field mice of the genus Apodemus (Mammalia: Rodentia) from China. Zoological Research, 39(5): 348-355. DOI: 10.24272/j.issn.2095-8137.2018.054
Citation: Masaharu Motokawa, Yi Wu, Masashi Harada, Yuta Shintaku, Xue-Long Jiang, Yu-Chun Li. 2018: Karyotypes of field mice of the genus Apodemus (Mammalia: Rodentia) from China. Zoological Research, 39(5): 348-355. DOI: 10.24272/j.issn.2095-8137.2018.054

中国姬鼠属的核型研究

Karyotypes of field mice of the genus Apodemus (Mammalia: Rodentia) from China

  • 摘要: 作者报道了大耳姬鼠(2n=48, FNa=48)、中华姬鼠(2n=48, FNa=48)、澜沧江姬鼠(2n=48, FNa=48)和高山姬鼠(2n=48, FNa=56)的核型,且除大耳姬鼠之外,均为首次报道。与已知染色体数的物种类似,上述姬鼠都具有较多的近端着丝点染色体;而C带核型的分析显示大耳姬鼠的异染色质占比很高。通过与其他姬鼠物种核型的比较,作者首次推导了姬鼠核型的演化模型,并提出染色体重排与异域成种均为姬鼠不同种组之间以及亚种各种组内物种分化重要原因的假说。例如大耳姬鼠与中华姬鼠复合种(包括中华姬鼠、澜沧江姬鼠和森鼠)的祖先很可能为同域分布,由于大耳姬鼠祖先染色体异染色质的增加导致交配后隔离,并导致二者的同域分化。

     

    Abstract: Karyotypes of four Chinese species of field mice of the genus Apodemus were examined, including Apodemus chevrieri (diploid chromosome number, 2n=48, fundamental number of autosomal arms, FNa=56), A. draco (2n=48, FNa=48), A. ilex (2n=48, FNa=48), and A. latronum (2n=48, FNa=48). Karyotypes of A. chevrieri, A. draco, and A. ilex are reported here for the first time, providing useful information for their species taxonomy. Determining the karyotypes of all species of Apodemus in Asia, both in this and previous studies, provides a solid overview of the chromosome evolution and species differentiation of the genus in East Asia. In addition to allopatric speciation, chromosome rearrangements likely played an important role in the formation of the four Apodemus species groups as well as speciation within each group in East Asia. For example, increased centromeric heterochromatin in A. latronum may have contributed to the post-mating reproductive isolation from the A. draco-A. ilex-A. semotus clade.

     

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