Fan Zhenxin, Liu Shaoying, Liu Yang, Zeng Bo, Zhang Xiuyue, Guo Cong, Yue Bisong
Sichuan Key Laboratory of Conservation Biology on Endangered Wildlife, College of Life Sciences, Sichuan University, Chengdu, PR China.
Mol Phylogenet Evol. 2009 Jun;51(3):447-53. doi: 10.1016/j.ympev.2009.03.005. Epub 2009 Mar 19.
Although the subfamily Zapodinae (Rodentia, Dipodidae) contains only five species, the phylogeny and taxonomy of these species are still being disputed. First, whether Eozapus and Napaeozapus should be treated as independent genera or subgenera of Zapus has been argued for a long period. Second, the subspecific genetic differentiation of Chinese jumping mouse (Eozapus setchuanus) has not been studied in detail, neither from morphological nor molecular aspects. In this study, the phylogenetic relationship among all the five species of Zapodinae was reconstructed using DNA sequence data from the mitochondrial cytochrome b gene and the nuclear interphotoreceptor retinoid binding protein gene. Bayesian inference, maximum parsimony and maximum likelihood analyses were conducted. The results showed that two major clades could be recognized within Zapodinae. Eozapus setchuanus, is the species endemic to China, strongly formed a monophyletic clade. In the other clade, genus Zapus received significant support in all analyses to be the sister group of the genus Napaeozapus. By comparing genetic distances among these three genera, we conclude that both Eozapus and Napaeozapus should be considered as valid genera rather than subgenera of Zapus. Furthermore, we observed that the two subspecies of E. setchuanus did not form reciprocally monophyletic groups, thus the traditional taxonomy which divided E. setchuanus into two subspecies based on only one morphological character was questionable.
虽然林跳鼠亚科（啮齿目，跳鼠科）仅包含5个物种，但这些物种的系统发育和分类仍存在争议。首先，长吻林跳鼠属（Eozapus）和倭林跳鼠属（Napaeozapus）应被视为独立的属还是林跳鼠属（Zapus）的亚属，这一问题已争论了很长时间。其次，中华林跳鼠（Eozapus setchuanus）的亚种遗传分化，无论是从形态学还是分子方面，都尚未得到详细研究。在本研究中，利用线粒体细胞色素b基因和核内感光视网膜结合蛋白基因的DNA序列数据，重建了林跳鼠亚科所有5个物种之间的系统发育关系。进行了贝叶斯推断、最大简约法和最大似然法分析。结果表明，林跳鼠亚科可分为两个主要分支。中华林跳鼠是中国特有的物种，强烈形成一个单系分支。在另一个分支中，林跳鼠属在所有分析中都得到了显著支持，是倭林跳鼠属的姐妹群。通过比较这三个属之间的遗传距离，我们得出结论，长吻林跳鼠属和倭林跳鼠属都应被视为有效的属，而不是林跳鼠属的亚属。此外，我们观察到中华林跳鼠的两个亚种并没有形成相互单系的类群，因此仅基于一个形态特征将中华林跳鼠分为两个亚种的传统分类法是值得怀疑的。
