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Using 3D geometric morphometrics to aid taxonomic and ecological understanding of a recent speciation event within a small Australian marsupial (Antechinus: Dasyuridae)
Zoological Journal of the Linnean Society ( IF 2.8 ) Pub Date : 2021-06-25 , DOI: 10.1093/zoolinnean/zlab048
Pietro Viacava 1 , Andrew M Baker 2, 3 , Simone P Blomberg 1 , Matthew J Phillips 2 , Vera Weisbecker 4
Affiliation  

Taxonomic distinction of species forms the foundation of biodiversity assessments and conservation priorities. However, traditional morphological and/or genetics-based taxonomic assessments frequently miss the opportunity of elaborating on the ecological and functional context of species diversification. Here, we used 3D geometric morphometrics of the cranium to improve taxonomic differentiation and add ecomorphological characterization of a young cryptic divergence within the carnivorous marsupial genus Antechinus. Specifically, we used 168 museum specimens to characterize the recently proposed clades A. stuartii ‘south’, A. stuartii ‘north’ and A. subtropicus. Beyond slight differences attributable to overall size (and, therefore, not necessarily diagnostic), we also found clear allometry-independent shape variation. This allowed us to define new, easily measured diagnostic traits in the palate, which differentiate the three clades. Contrary to previous suggestions, we found no support for a latitudinal gradient as causing the differentiation between the clades. However, skull shape co-varied with temperature and precipitation seasonality, suggesting that the clades may be adapted to environmental variables that are likely to be impacted by climate change. Our study demonstrates the use of 3D geometric morphometrics to improve taxonomic diagnosis of cryptic mammalian species, while providing perspectives on the adaptive origins and potential future threats of mammalian diversity.

中文翻译:

使用 3D 几何形态学来帮助了解澳大利亚小型有袋动物(Antechinus:Dasyuridae)最近的物种形成事件的分类学和生态学

物种的分类区分构成了生物多样性评估和保护优先事项的基础。然而,传统的基于形态学和/或遗传学的分类学评估经常错过详细阐述物种多样化的生态和功能背景的机会。在这里,我们使用头盖骨的 3D 几何形态学来改善分类学分化,并在肉食性有袋动物 Antechinus 中添加一个年轻的神秘分歧的生态形态学特征。具体来说,我们使用 168 个博物馆标本来表征最近提出的进化枝 A. stuartii 'south'、A. stuartii 'north' 和 A. subtropicus。除了可归因于整体尺寸的细微差异(因此不一定是诊断性的)外,我们还发现了明显的异速生长无关的形状变化。这使我们能够在味觉中定义新的、易于测量的诊断特征,从而区分三个进化枝。与之前的建议相反,我们发现没有支持纬度梯度导致进化枝之间的差异。然而,头骨形状与温度和降水季节性共同变化,这表明进化枝可能适应可能受气候变化影响的环境变量。我们的研究展示了使用 3D 几何形态计量学来改进神秘哺乳动物物种的分类诊断,同时提供关于哺乳动物多样性的适应性起源和潜在未来威胁的观点。我们发现不支持纬度梯度导致进化枝之间的差异。然而,头骨形状与温度和降水季节性共同变化,这表明进化枝可能适应可能受气候变化影响的环境变量。我们的研究展示了使用 3D 几何形态计量学来改进神秘哺乳动物物种的分类诊断,同时提供关于哺乳动物多样性的适应性起源和潜在未来威胁的观点。我们发现不支持纬度梯度导致进化枝之间的差异。然而,头骨形状与温度和降水季节性共同变化,这表明进化枝可能适应可能受气候变化影响的环境变量。我们的研究展示了使用 3D 几何形态计量学来改进神秘哺乳动物物种的分类诊断,同时提供关于哺乳动物多样性的适应性起源和潜在未来威胁的观点。
更新日期:2021-06-25
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