Wang Bin, Jiang Jianping, Xie Feng, Chen Xiaohong, Dubois Alain, Liang Gang, Wagner Steven
Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China.
Zoolog Sci. 2009 Jul;26(7):500-9. doi: 10.2108/zsj.26.500.
Using mitochondrial 12S rRNA, 16S rRNA, and ND2 sequences, we investigated phylogenetic relationships among populations of two frog species endemic to China, both referred to the genus Feirana. A sister-group relationship between the two species was supported moderately in a maximum likelihood analysis and significantly in a Bayesian analysis, but not in a maximum parsimony analysis, of combined data for the three genes. Pending resolution of this incongruence, we provisionally maintain these species in the genus Feirana. Two major clades with a deep divergence are concordant with the species F. quadranus and "F." taihangnica. In the present work, some populations from the Qinling Mountains and all those from the Funiu and the Zhongtiao-southern Taihang Mountains are referred to "F." taihangnica rather than F. quadranus, whereas others are referred to F. quadranus. Consequently, the main body of the Qinling Mountains was identified as a large contact zone between these two species. On the basis of phylogenetic relationships and the distribution pattern of populations, we propose a hypothesis for the divergence of "F." taihangnica: the ancestral species might have inhabited the westernmost Qinling Mountains and dispersed to the main Qinling Mountains, and then to the Zhongtiao-southern Taihang and Funiu Mountains. In contrast, two alternative hypotheses are suggested for F. quadranus: if the two species are confirmed as sister groups, F. quadranus might have dispersed from the westernmost Qinling to the Longmen, Qinling, Daba, and northern Wuling Mountains; alternatively, F. quadranus might have come from the northern Wuling Mountains and then dispersed to the Daba, Qinling, and Longmen mountains.
利用线粒体12S rRNA、16S rRNA和ND2序列,我们研究了中国特有的两种蛙类(均隶属于髭蟾属)种群之间的系统发育关系。在对这三个基因的合并数据进行的最大似然分析中,这两个物种之间的姐妹群关系得到了适度支持,在贝叶斯分析中得到了显著支持,但在最大简约分析中未得到支持。在解决这一不一致性之前,我们暂时将这些物种保留在髭蟾属中。两个分化程度很深的主要分支与峨眉髭蟾和“太行髭蟾”物种一致。在本研究中,秦岭山脉的一些种群以及伏牛山和中条山—南太行山的所有种群被归为“太行髭蟾”而非峨眉髭蟾,而其他种群则归为峨眉髭蟾。因此,秦岭山脉的主体被确定为这两个物种之间的一个大型接触带。基于系统发育关系和种群分布模式,我们提出了一个关于“太行髭蟾”分化的假说:其祖先物种可能栖息在秦岭山脉最西端,然后扩散到秦岭山脉主体,再到中条山—南太行山和伏牛山。相比之下,对于峨眉髭蟾提出了两种替代假说:如果这两个物种被确认为姐妹群,峨眉髭蟾可能从秦岭山脉最西端扩散到龙门山、秦岭、大巴山和武陵山北部;或者,峨眉髭蟾可能来自武陵山北部,然后扩散到大巴山、秦岭和龙门山。