Dental topography of platyrrhines and prosimians: convergence and contrasts.
Dental topography of platyrrhines and prosimians: convergence and contrasts.
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阔鼻类和原猴类的牙齿地形：趋同与对比。
DOI：
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发表时间：
2014
影响因子：
2.8
通讯作者：
J. Ledogar
中科院分区：
文献类型：
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作者：
J. Winchester;D. Boyer;Elizabeth M St Clair;Ashley D. Gosselin;S. Cooke;J. Ledogar
牙齿形貌分析是对牙冠三维模型形状和部件特征的定量评估。磨牙地形曲率、起伏和复杂性与某些现存灵长类动物的摄食行为相关，并已被用来研究现存和灭绝的灵长类动物的饮食生态学。这项研究调查了不同的活鸭嘴兽样本中牙齿地形是否与饮食相关，并将鸭嘴兽的地形与原猿的牙齿地形进行了比较。我们对 11 个阔叶类属的 111 个下第二磨牙和 20 个原猴属的 121 个下第二磨牙进行了采样。对于每颗牙齿，我们计算了狄利克雷法向能量 (DNE)、浮雕指数 (RFI) 和方向斑块计数 (OPCR)，分别量化表面曲率、浮雕和复杂性。还测量了剪切比和商。统计分析了饮食和分类单元对单独的阔鼻类和相对于原猴类的地形的影响。判别函数分析评估了预测饮食模型。结果表明，鸭嘴兽的牙齿地形与饮食偏好相关，并且仅使用鸭嘴兽的预测模型具有很高的准确率。对于原猿来说也是如此。阔鼻类和原猴类的地形变异大致相似。一个例外是阔鼻类动物表现出较高的平均浮凸和较低的浮凸方差，这可能与较低的相对摩尔尺寸以及浮凸和牙齿寿命之间不同于曲率或复杂性的功能联系有关。将系统发育距离矩阵明确纳入阔鼻-原猿组合样本的统计分析中，会导致 OPCR 和 SQ 的饮食影响显着性丧失，同时大大增加 RFI 的饮食显着性。
Dental topographic analysis is the quantitative assessment of shape of three-dimensional models of tooth crowns and component features. Molar topographic curvature, relief, and complexity correlate with aspects of feeding behavior in certain living primates, and have been employed to investigate dietary ecology in extant and extinct primate species. This study investigates whether dental topography correlates with diet among a diverse sample of living platyrrhines, and compares platyrrhine topography with that of prosimians. We sampled 111 lower second molars of 11 platyrrhine genera and 121 of 20 prosimian genera. For each tooth we calculated Dirichlet normal energy (DNE), relief index (RFI), and orientation patch count (OPCR), quantifying surface curvature, relief, and complexity respectively. Shearing ratios and quotients were also measured. Statistical analyses partitioned effects of diet and taxon on topography in platyrrhines alone and relative to prosimians. Discriminant function analyses assessed predictive diet models. Results indicate that platyrrhine dental topography correlates to dietary preference, and platyrrhine-only predictive models yield high rates of accuracy. The same is true for prosimians. Topographic variance is broadly similar among platyrrhines and prosimians. One exception is that platyrrhines display higher average relief and lower relief variance, possibly related to lower relative molar size and functional links between relief and tooth longevity distinct from curvature or complexity. Explicitly incorporating phylogenetic distance matrices into statistical analyses of the combined platyrrhine-prosimian sample results in loss of significance of dietary effects for OPCR and SQ, while greatly increasing dietary significance of RFI.