Geographic Variation in the Two Smooth Skinks, Scincella boettgeri and S. formosensis (Squamata: Scincidae), in the Subtropical East Asian Islands
Geographic Variation in the Two Smooth Skinks, Scincella boettgeri and S. formosensis (Squamata: Scincidae), in the Subtropical East Asian Islands
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亚热带东亚群岛两种光滑石龙子 Scincella boettgeri 和 S. formosensis（有鳞目：石龙科）的地理变异
DOI：
10.2108/zsj.18.115
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发表时间：
2001
影响因子：
0.9
通讯作者：
T. Hikida
中科院分区：
文献类型：
--
作者：
SZU;H. Ota;T. Hikida
摘要 Scincella boettgeri 和 S. formosensis 是两种小型的石龙子，分别产于琉球南部和台湾。这两个物种的分类学分离仅取决于几个外部特征，这些特征在每个物种内似乎或多或少都有变化。为了研究其形态变异的地理格局，对来自宫古群和八重山群的 12 个岛屿的 680 个 S. boettgeri 标本和来自台湾 10 个地区的 193 个 S. boettgeri 标本的 23 个分枝特征和 16 个形态特征进行了多变量分析。使用分数数据对代表当地人群的样本进行规范判别分析（CDA），将琉球南部和台湾的组合完全分开，支持它们分配到不同的类群。另一方面，使用形态测量数据的分析仍然保持它们的变化部分相互重叠。在检查的 S. boettgeri 样本中，波照岛样本与其他样本明显不同，而高雄样本与台湾 S. boettgeri 样本之间有些不同。从样本之间的马哈拉诺比斯距离得出的邻近连接表型图显示，分支模式明显与其所在地点的地形（对于 S. formosensis）或推定的地史关系（对于 S. boettgeri）不一致。这表明，这些物种的外部数量特征往往在局部环境的影响下迅速变化，而不是在地理隔离后随着时间的推移而变化。
Abstract Scincella boettgeri and S. formosensis are two small lygosomine skinks endemic to the southern Ryukyus and Taiwan, respectively. Taxonomic separation of these two species depends on only a few external characters that are seemingly more or less variable within each species. To investigate the geographic pattern of their morphological variations, multivariate analyses were performed for 23 meristic and 16 morphometric characters in 680 specimens of S. boettgeri from 12 islands of the Miyako and Yaeyama Groups and 193 specimens of S. formosensis from ten localities in Taiwan. The canonical discriminant analysis (CDA) for samples representing local populations using meristic data completely separated the southern Ryukyu and Taiwanese assemblages, supporting their assignments to different taxa. On the other hand, the analyses using morphometric data remained their variations partially overlapping each other. Of the samples of S. boettgeri examined, the Haterumajima sample markedly varied from the others, whereas the Kaohsiung sample was somewhat divergent among the S. formosensis samples. Neighbor-joining phenograms derived from Mahalanobis distances among the samples showed branching patterns apparently inconsistent with the topographical (for S. formosensis) or putative geohistorical relationships of their localities (for S. boettgeri). This suggests that in these species external quantitative characters often rapidly vary under the influence of localized environments rather than of the passage of time after geographical isolations.