Geographic Variation in the Endemic Skink, Ateuchosaurus pellopleurus from the Ryukyu Archipelago, Japan
Geographic Variation in the Endemic Skink, Ateuchosaurus pellopleurus from the Ryukyu Archipelago, Japan
复制标题
日本琉球群岛特有石龙子（Ateuchosaurus pellopleurus）的地理变异
DOI：
10.2307/1565549
复制
发表时间：
1999
影响因子：
0.8
通讯作者：
T. Hikida
中科院分区：
文献类型：
--
作者：
H. Ota;Haruki Miyaguni;T. Hikida
分析了琉球特有龙骨龙28个数量性状和1个质量性状的变异。数量性状的多变量分析显示岛屿种群间存在广泛的差异。岛屿样本间马氏距离的相邻连接物象图中的分支拓扑结构与它们的地理排列一致，表明地质历史对分支格局有很大贡献。相比之下，枝条长度在物候图中似乎不能很好地反映古地理，可能是由于小岛屿种群快速形态变化的噪声。我们的分析没有显示出托卡拉构造海峡东北和西南岛屿上的种群之间有明显的差异。接受目前的古地理假说，即该海峡自上新世形成以来一直存在。研究结果还表明，冲绳种群与其他种群之间出现了初级分化。然而，由于这两个类群之间甚至没有一个区别特征，我们拒绝接受以前一些作者提出的物种分类细分。
Variation in 28 quantitative characters and one qualitative character in the endemic Ryukyu skink Ateuchosaurus pellopleurus was analyzed. Multivariate analysis of the quantitative characters revealed extensive variation among the insular populations. Branching topology in the neighbor-joining phenogram deriving from Mahalanobis distances among island samples coincides well with their geographic arrange- ment, suggesting a great contribution of geohistory to the branching pattern. By contrast, branch length in the phenogram does not seem to reflect the paleogeography well, presumably due to noise from rapid morphological changes in small island populations. None of our analyses demonstrated distinct divergence between populations on islands northeast and southwest of the Tokara Tectonic Strait Accepting the current paleogeographical hypothesis that this strait has consistently existed since its initial formation in the Plio- cene, we interpret this result as indicative of recent oversea dispersal across the strait Results of the analyses also suggested that in A. pellopleurus primary divergence occurred between populations of the Okinawa Group and the remainder. Nevertheless, because of the absence of even a single discriminant character between these two groups, we reject taxonomic subdivision of the species proposed by a few previous authors.