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Wearing down the constraints of low magnification tooth microwear analysis: reproducibility and variability of results based on extant ungulates
PalZ ( IF 1.8 ) Pub Date : 2021-02-24 , DOI: 10.1007/s12542-020-00539-2
Bence Szabó , Attila Virág

Low magnification dental microwear analysis is a widespread dietary proxy for palaeoenvironmental analyses. The limitations of the method, such as observer bias or variation of microwear scars between different tooth positions, are still not quite understood. This study aims to reveal that reproducibility and variability of low magnification dental microwear is better, than it was previously thought. The main focuses of this study were differences between results produced by independent observers, and individual variability of the wear features on different teeth of the same specimen. To approach these issues, the microwear of 1944 0.4 × 0.4 mm areas on every right molar and premolar (144 teeth of 12 extant ungulate specimens) was quantified. Reproducibility and interobserver error was tested by calculating the intraclass correlation coefficients for the scores produced by the observers. The microwear features of each tooth were characterized by the mean, median, standard deviation, range, skewness and kurtosis. These statistical parameters were than compared. To test whether observed differences between the microwear patterns of different tooth positions are significant, ANOVA and Dunnett’s post hoc tests were performed. To calculate the minimal number of sampling sites required for characterizing a tooth, a computer-assisted bootstrap method was applied. As a result, it can be suggested that the low magnification microwear method is quite robust, with low interobserver error. The variance of microwear scars seems uniform throughout the dentition of the examined specimens. Some differences can be noted between tooth positions, however, some limitations could be lifted, at least in the case of ungulates.



中文翻译:

减少低倍率牙齿微磨损分析的局限性:基于现存有蹄类动物的结果的可重复性和可变性

低倍率牙齿微磨损分析是古环境分析的一种广泛的饮食替代方法。该方法的局限性,例如观察者的偏见或不同牙齿位置之间微磨损疤痕的变化,仍然不是很清楚。这项研究旨在揭示,低倍率牙科微磨的可重复性和可变性比以前认为的要好。这项研究的主要重点是独立观察者产生的结果之间的差异,以及同一样本不同牙齿上的磨损特征的个体差异。为了解决这些问题,对每个右磨牙和前磨牙(12个现存的有蹄类动物标本的144颗牙齿)上1944年0.4×0.4 mm面积的微磨损进行了量化。通过计算观察者产生的分数的组内相关系数,测试了可重复性和观察者间误差。每颗牙齿的微磨损特征由平均值,中位数,标准差,范围,偏度和峰度表征。然后比较这些统计参数。为了测试观察到的不同牙齿位置的微磨损模式之间的差异是否显着,进行了ANOVA和Dunnett的事后测试。为了计算表征牙齿所需的最少采样点数量,应用了计算机辅助自举方法。结果,可以认为低倍微磨损方法是非常鲁棒的,观察者间误差低。在整个被检样品的牙列中,微磨损疤痕的变化似乎是均匀的。

更新日期:2021-02-25
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