A multidisciplinary approach reveals hidden taxonomic diversity in the morphologically challenging Taxus wallichiana complex
A multidisciplinary approach reveals hidden taxonomic diversity in the morphologically challenging Taxus wallichiana complex
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作者：
Moeller, Michael;Gao, Lian-Ming;Li, De-Zhu
解决形态复杂群体的分类问题可能具有挑战性。将多变量形态分析和分子数据的结果关联起来，并将这些结果与地理分布相协调，使我们能够解决中国及周边地区分类学上困难的红豆杉复合体的分类问题。我们对 79 个种群和 43 个类型和副型标本的 1240 个样本使用了叶绿体 trnL-F 内含子/间隔区（基因型）的 27 个形态特征（表型）和序列，并证明了表型和基因型以及地理分布之间的强相关性。我们能够定义该复合体中分类学上离散单位的数量，并描绘出中国和邻近地区的五种植物（T chinensis、T florinii、T mairei、T wallichiana 和此处描述的新种 T calcicola）的地理分布。这些比最近提出的物种数量要少得多，并且表现出极大的非重叠和连续分布。根据物种“典型”标本的描述，我们准备了物种特异性的形态特征，可以生成物种分化矩阵，从而可以快速选择最合适的特征来分离任何物种对。这项工作代表着朝着完成可行的亚洲红豆杉分类学迈出了一步。
Addressing the taxonomy of morphologically complex groups can be challenging. Correlating results from multivariate morphological analyses and molecular data and reconciling these with geographic distributions allowed us to address the classification of the taxonomically difficult Taxus wallichiana complex in China and surrounding areas. We used 27 morphological characters (phenotype) and sequences of the chloroplast trnL-F intron/spacer region (genotype) on 1240 samples of 79 populations and 43 type and paratype specimens and demonstrated a strong correlation between phenotype and genotype and geographic distribution. We were able to define the number of taxonomically discrete units in the complex and delineate the geographic distribution of five species, T chinensis, T florinii, T mairei, T wallichiana and the here described new species T calcicola in China and adjacent regions. These are much fewer than the number of recently proposed species and these exhibit greatly non-overlapping and continuous distributions. Based on descriptions of species-"typical" specimens, we prepared species-specific morphometric profiles, that allowed the generation of a species differentiation matrix, allowing the quick selection of the most suitable characters for the separation of any species pair. This work represents a step forward towards the completion of a workable taxonomy of Asian Taxus.