Intra- and Interspecific Variation in Macaque Molar Enamel Thickness
Intra- and Interspecific Variation in Macaque Molar Enamel Thickness
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DOI：
10.1002/ajpa.22593
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发表时间：
2014-11-01
影响因子：
2.8
通讯作者：
Smith, Tanya M.
中科院分区：
文献类型：
--
作者：
Kato, Akiko;Tang, Nancy;Smith, Tanya M.
釉质厚度在灵长类动物分类学、系统发育和功能形态研究中发挥了重要作用，尽管其在人类中的差异知之甚少。在过去的五百万年里，猕猴在其广泛的地理分布、身体大小的相对范围和辐射方面与人类相似。为了探索釉质厚度的变化，我们量化了恒河猴、短束猕猴、短毛猕猴、恒河猴和恒河猴的平均和相对釉质厚度(AET和RET)。测量了386颗磨牙的牙釉质面积、牙本质面积和牙釉质-牙本质交界处长度。AET和RET没有发现种内性别差异。黑尾猕猴AET和RET最高，丛枝猕猴AET最低，弧纹猕猴RET最低。猕猴的纬度分布与这6种猕猴的AET相关。温带猕猴有比热带猕猴更厚的磨牙釉质，这表明厚厚的釉质可能适合季节性环境。还需要进一步的研究来确定温带猕猴的厚牙釉质是否是对强化的硬物摄食、更多的磨损和/或更广泛的饮食和更广泛的食物材料特性的反应。猕猴的极端生态灵活性可能会阻止识别特定饮食和牙釉质厚度条件之间的一致趋势。这种对生态变异性、饮食多样性和釉质厚度的复杂解释可能同样适用于化石人物种。Am J Phys Anthropol155：447-459,2014。(C)2014年威利期刊公司。
Enamel thickness has played an important role in studies of primate taxonomy, phylogeny, and functional morphology, although its variation among hominins is poorly understood. Macaques parallel hominins in their widespread geographic distribution, relative range of body sizes, and radiation during the last five million years. To explore enamel thickness variation, we quantified average and relative enamel thickness (AET and RET) in Macaca arctoides, Macaca fascicularis, Macaca fuscata, Macaca mulatta, Macaca nemestrina, and Macaca sylvanus. Enamel area, dentine area, and enamel-dentine junction length were measured from mesial sections of 386 molars scanned with micro-computed tomography, yielding AET and RET indices. Intraspecific sex differences were not found in AET or RET. Macaca fuscata had the highest AET and RET, M. fascicularis showed the lowest AET, and M. arctoides had the lowest RET. The latitudinal distribution of macaque species was associated with AET for these six species. Temperate macaques had thicker molar enamel than did tropical macaques, suggesting that thick enamel may be adaptive in seasonal environments. Additional research is needed to determine if thick enamel in temperate macaques is a response to intensified hard-object feeding, increased abrasion, and/or a broader diet with a greater range of food material properties. The extreme ecological flexibility of macaques may prohibit identification of consistent trends between specific diets and enamel thickness conditions. Such complications of interpretation of ecological variability, dietary diversity, and enamel thickness may similarly apply for fossil Homo species. Am J Phys Anthropol 155:447-459, 2014. (c) 2014 Wiley Periodicals, Inc.