Age-related tooth wear differs between forest and savanna primates.
Age-related tooth wear differs between forest and savanna primates.
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DOI：
10.1371/journal.pone.0094938
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发表时间：
2014
期刊：
影响因子：
3.7
通讯作者：
Charpentier MJ
中科院分区：
文献类型：
--
作者：
Galbany J;Romero A;Mayo-Alesón M;Itsoma F;Gamarra B;Pérez-Pérez A;Willaume E;Kappeler PM;Charpentier MJ
灵长类动物的牙齿磨损是由衰老和生态因素引起的。然而，能够使我们描述这些因素的贡献的比较数据是缺乏的。在这里，我们通过对来自加蓬森林和肯尼亚热带草原栖息地的两种野生非洲灵长类动物种群的牙本质暴露（PDE）百分比进行评分，对比年龄依赖性臼齿磨损。我们发现森林生活的山魈的PDE随年龄的增长明显高于热带草原黄狒狒。山魈主要以坚硬的大型食物为食，比如硬壳水果，栖息在石英矿物含量很高的生态系统中。相比之下，狒狒消耗大量附着在地下储存器官上的外源砂砾，但狒狒生活的土壤中石英的比例很低。我们的研究结果支持了一个假设，即年龄、食物的物理性质和土壤成分，特别是石英的丰富度，都是影响牙齿磨损的重要因素。我们进一步提出，随着年龄的增长，山魈牙齿磨损的加速导致磨牙变平，这可能代表了它们对环境中存在的硬食物的适应。
Tooth wear in primates is caused by aging and ecological factors. However, comparative data that would allow us to delineate the contribution of each of these factors are lacking. Here, we contrast age-dependent molar tooth wear by scoring percent of dentine exposure (PDE) in two wild African primate populations from Gabonese forest and Kenyan savanna habitats. We found that forest-dwelling mandrills exhibited significantly higher PDE with age than savanna yellow baboons. Mandrills mainly feed on large tough food items, such as hard-shell fruits, and inhabit an ecosystem with a high presence of mineral quartz. By contrast, baboons consume large amounts of exogenous grit that adheres to underground storage organs but the proportion of quartz in the soils where baboons live is low. Our results support the hypothesis that not only age but also physical food properties and soil composition, particularly quartz richness, are factors that significantly impact tooth wear. We further propose that the accelerated dental wear in mandrills resulting in flatter molars with old age may represent an adaptation to process hard food items present in their environment.
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