Karyotype, chromosome structure, reproductive modalities of three Southern Eurasian populations of the common lacertid lizard, Zootoca vivipara (Jacquin, 1787)
Karyotype, chromosome structure, reproductive modalities of three Southern Eurasian populations of the common lacertid lizard, Zootoca vivipara (Jacquin, 1787)
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DOI：
10.13128/acta_herpetol-2677
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发表时间：
2008-12
影响因子：
0.8
通讯作者：
L. Kupriyanova;A. Kuksin;G. Odierna
中科院分区：
文献类型：
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作者：
L. Kupriyanova;A. Kuksin;G. Odierna
根据胎生进化假说，该物种的残存卵生种群可能出现在其分布区的东南部。通过对俄罗斯东南部三个种群的核型、染色体结构和生殖方式的比较，验证了这一假说，其中包括阿拉泰及其邻近地区，这些地区在更新世降温期间仍有小块领土处于孤立状态，并在那里发现了胎生轮虫的更新世化石。染色体研究采用常规染色方法和显带方法，即C-显带和C-显带+荧光染料、CMA-3和DAPI的序贯染色。所有研究的雌性都表现出胎生生殖方式，核型为2N=35个端粒染色体，带有Z1Z2W性染色体系统。W染色体为近端着丝粒染色体。核型和异染色质的分布和组成没有种群间的变异。从获得的数据来看，所研究的三个俄罗斯东南部的胎生种群属于俄罗斯的胎生型Z.v.vivipara。
According to a hypothesis of the evolution of viviparity the lacertid lizard Zootoca vivipara, rare relict oviparous populations of the species might occur in south - ern-eastern part of its distribution area. Such a hypothesis has been verified by compar - ing the karyotype, chromosome structure, and reproductive modality of three popula - tions of south-eastern part of Russia, including Altai and neighbouring regions, where small territories remained isolated during the Pleistocene cooling and where Pleistoce - nic fossils of Z. vivipara have been found. The chromosomal study was carried out by conventional staining method and banding methods, namely C-banding and sequential staining of C-banding+ fluorochromes, CMA 3 and DAPI. All studied females displayed viviparous reproductive modality and showed a karyotype of 2N = 35 acrocentric chro - mosomes, with a Z1Z2W sex chromosome system. Chromosome W was subtelocentric . No inter-population variability on karyotype and heterochromatin distribution and composition was observed. From the obtained data the three studied south-eastern Russian viviparous populations belong to the Russian viviparous form of Z. v. vivipara.