Quantitative three-dimensional microtextural analyses of tooth wear as a tool for dietary discrimination in fishes
Quantitative three-dimensional microtextural analyses of tooth wear as a tool for dietary discrimination in fishes
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DOI：
10.1098/rsif.2012.0140
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发表时间：
2012-09-07
影响因子：
3.9
通讯作者：
Galis, Frietson
中科院分区：
文献类型：
--
作者：
Purnell, Mark A.;Seehausen, Ole;Galis, Frietson
资源多态和对资源的竞争是物种形成的重要因素。许多例子来自鱼类，慈鱼特别重要，因为它们在生态、发育、遗传和进化的界面上扮演着模式生物的角色。然而，分析鱼类的营养资源利用可能是困难和耗时的，对于鱼类化石物种来说，这尤其是个问题。在这里，我们提出的证据表明，基于高分辨率(亚微米级)三维数据和新的ISO表面纹理量化标准的牙齿微磨损分析为饮食鉴别和营养资源开发调查提供了强有力的工具。我们的结果表明，与二维操作员评分的微磨损分析方法相比，三维分析方法具有显著的优势，包括适用于没有明显划痕和凹坑的粗糙牙齿表面。牙齿微磨损质地的形成时间比胃内容物所代表的时间更长，基于质地的分析不太容易受到机会性喂养带来的偏见。他们对细微的饮食差异比同位素分析更敏感。牙齿微磨损的定量质地分析在对现存和灭绝的鱼类的营养分析中发挥着有益的作用，是对现有方法的补充。
Resource polymorphisms and competition for resources are significant factors in speciation. Many examples come from fishes, and cichlids are of particular importance because of their role as model organisms at the interface of ecology, development, genetics and evolution. However, analysis of trophic resource use in fishes can be difficult and time-consuming, and for fossil fish species it is particularly problematic. Here, we present evidence from cichlids that analysis of tooth microwear based on high-resolution (sub-micrometre scale) three-dimensional data and new ISO standards for quantification of surface textures provides a powerful tool for dietary discrimination and investigation of trophic resource exploitation. Our results suggest that three-dimensional approaches to analysis offer significant advantages over two-dimensional operator-scored methods of microwear analysis, including applicability to rough tooth surfaces that lack distinct scratches and pits. Tooth microwear textures develop over a longer period of time than is represented by stomach contents, and analyses based on textures are less prone to biases introduced by opportunistic feeding. They are more sensitive to subtle dietary differences than isotopic analysis. Quantitative textural analysis of tooth microwear has a useful role to play, complementing existing approaches, in trophic analysis of fishes-both extant and extinct.