Geographic variation in quantitative skull traits and systematic of southern populations of the leaf-eared mice of the Phyllotis xanthopygus complex (Cricetidae, Phyllotini) in southern South America.
Geographic variation in quantitative skull traits and systematic of southern populations of the leaf-eared mice of the Phyllotis xanthopygus complex (Cricetidae, Phyllotini) in southern South America.
复制标题
南美洲南部的Phyllotis xanthopygus 复合体（仓鼠科，Phyllotini）叶耳小鼠头骨数量性状的地理变异和南方种群的系统。
作者：
P. Teta;J. P. Jayat;C. Lanzone;A. Ojeda
Phyllotis 属叶耳鼠（Cricetidae，Phyllotini）包括至少 20 种中型新热带啮齿动物，主要分布在整个安第斯地区。几位作者根据形态学和分子数据对其限制和内容进行了审查。然而，没有针对地理覆盖范围广泛的大量个体样本采取综合方法。本文的目的是： (i) 评估物种限制； (ii) 测试南美洲南部 Phyllotis xanthopygus 复合体内分子和定量形态学证据之间的一致性。我们的结果对 P. bonariensis 的具体地位提出了质疑，它是一种地理上孤立的形式，要么被认为是有效物种，要么被认为是 P. xanthopygus 的同义词。定量形态学（头骨的大小和形状）和分子数据将 P. bonariensis 与传统上称为 P. xanthopygus vaccarum 的阿根廷中部种群联系起来。属于阿根廷南部和智利种群的个体（P. x. xanthopygus）在头骨形态上非常同质，与阿根廷中北部和中西部的个体（P. x. xanthopygus）表现出微妙甚至不存在的差异。真空。我们发现从形态学（这项工作）和先前研究的线粒体 DNA 结果推断的组之间存在一些不一致。中北部和中西部种群的情况就是如此，其形态特征并未表现出分子特征检测到的强烈分化。我们的结果强调了综合分类学研究的必要性，不仅是为了界定分类单位，也是为了更好、更全面地理解种群变异和分化。
The leaf-eared mice of the genus Phyllotis (Cricetidae, Phyllotini) encompasses at least 20 species of medium-sized Neotropical rodents mostly distributed throughout the Andean region. Its limits and contents were reviewed by several authors, based both on morphological and molecular data. However, no integrative approaches were conducted based on large samples of individuals with a wide geographical coverage. The purposes of this paper are: (i) to evaluate species limits; and (ii) to test the congruence between molecular and quantitative morphological evidences within the Phyllotis xanthopygus complex in southern South America. Our results questioned the specific status of P. bonariensis, a geographically isolated form that was either considered as a valid species or as a synonym of P. xanthopygus. Quantitative morphological (size and shape of the skull) and molecular data linked P. bonariensis with populations from central Argentina traditionally referred as P. xanthopygus vaccarum. Individuals belonging to populations from southern Argentina and Chile (P. x. xanthopygus) were remarkably homogeneous in their skull morphology, showing a subtle to non-existent differentiation from those of north-central and west-central Argentina referred to P. x. vaccarum. We found some incongruence between groups inferred from morphological (this work) and mitochondrial DNA results of previous studies. This is the case of the north-central and west-central populations, where morphological traits do not show the strong differentiation detected by molecular characters. Our results highlight the need for integrative taxonomic studies, not only to delimitate taxonomic units but also for a better and more comprehensive understanding of population variability and differentiation.