Yoshikawa Natsuhiko, Matsui Masafumi, Nishikawa Kanto, Misawa Yasuchika, Tanabe Shingo
Graduate School of Human and Environmental Studies, Kyoto University, Yoshida, Nihonmatsu-cho, Sakyo-ku, Kyoto, Japan.
Zoolog Sci. 2010 Jan;27(1):33-40. doi: 10.2108/zsj.27.33.
We conducted an electrophoretic survey to examine geographic genetic variation in samples from 17 localities of the Japanese clawed salamander, Onychodactylus japonicus. This species was divided into six genetic groups (N-Tohoku, S-Tohoku, Tsukuba, SW-Honshu, Kinki, and Shikoku) that were largely concordant with clades or subclades recognized in our previous mtDNA study. Although the relationships among these six groups were not clarified, genetic distances between them were not small (mean Nel's D=0. 146-0.471). Among these groups, the geographically isolated Tsukuba group was genetically distinct, possibly as a result of population isolation. In a locality of western Honshu, two groups, SW-Honshu and Shikoku, were found to occur sympatrically. Although several presumable hybrid individuals were found, hybridization between these two groups seemed to occur very rarely. These results indicate that the Shikoku group is specifically distinct from the SW-Honshu group, whose range includes the type locality of O. japonicus.
我们进行了一项电泳调查，以研究日本大鲵（Onychodactylus japonicus）17个地区样本的地理遗传变异。该物种被分为六个遗传组（东北北部、东北南部、筑波、本州西南部、近畿和四国），这在很大程度上与我们之前线粒体DNA研究中识别的进化枝或亚进化枝一致。尽管这六个组之间的关系尚未明确，但它们之间的遗传距离并不小（平均内尔氏遗传距离D = 0.146 - 0.471）。在这些组中，地理隔离的筑波组在遗传上是独特的，这可能是种群隔离的结果。在本州西部的一个地区，发现本州西南部和四国这两个组同域分布。尽管发现了几个可能的杂交个体，但这两个组之间的杂交似乎很少发生。这些结果表明，四国组与本州西南部组在物种上是不同的，本州西南部组的分布范围包括日本大鲵的模式产地。
