布卡俾格米人的乳第二磨牙的形态变异。
Morphological variation of the deciduous second molars in the Baka Pygmies.
机构信息
Department of Evolutionary Anthropology, University of Vienna, Vienna, Austria.
Core Facility for Micro-Computed Tomography, University of Vienna, Vienna, Austria.
出版信息
Sci Rep. 2021 Aug 13;11(1):16480. doi: 10.1038/s41598-021-95524-3.
The Baka Pygmies are known for their short stature resulting from a reduced growth rate during infancy. They are peculiar also for their teeth erupt earlier than in any other African population, and their posterior dentition is larger than in non-Pygmy populations. However, the Baka's dental morphology, like several other aspects of their biology, is still understudied. Here, we explore the variation of the Baka's deciduous upper and lower second molars (dm2s) in comparison to a geographically heterogeneous human sample by means of 3D geometric morphometrics and analysis of dental traits. Our results show that the different populations largely overlap based on the shape of their dm2s, especially the lower ones. Their distal region and the height of the dentinal crown differ the most, with the Baka showing the most extreme range of variation. Upper and lower dm2s covary to a great extent (RV = 0.82). The Baka's and South Americans' dm2s were confirmed among the largest in our sample. Despite the Baka's unique growth pattern, long-lasting isolation, and extreme dental variation, it is not possible to distinguish them from other populations based on their dm2s' morphology only.
巴卡俾格米人以其在婴儿期生长速度减慢导致的矮小身材而闻名。他们的牙齿也很特别,比任何其他非洲人群都更早萌出,而且后牙比非俾格米人群的更大。然而,巴卡人的牙齿形态,就像他们生物学的其他几个方面一样,仍有待研究。在这里,我们通过 3D 几何形态测量学和牙齿特征分析,比较了巴卡人的乳牙上下第二磨牙(dm2)与地理上异质的人类样本的变异情况。我们的结果表明,不同人群的 dm2 形状基本重叠,尤其是下 dm2。它们的远端区域和牙本质冠的高度差异最大,巴卡人的变异范围最为极端。上 dm2 和下 dm2 高度相关(RV=0.82)。巴卡人和南美人的 dm2 在我们的样本中是最大的。尽管巴卡人具有独特的生长模式、长期隔离和极端的牙齿变异,但仅凭 dm2 的形态无法将他们与其他人群区分开来。