Evolution of dentition in salamanders: relative roles of phylogeny and diet
Evolution of dentition in salamanders: relative roles of phylogeny and diet
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DOI：
10.1111/bij.12831
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发表时间：
2016-12
影响因子：
1.9
通讯作者：
A. Gregory;B. Sears;J. Wooten;C. Camp;A. Falk;K. O'Quin;T. Pauley
中科院分区：
文献类型：
--
作者：
A. Gregory;B. Sears;J. Wooten;C. Camp;A. Falk;K. O'Quin;T. Pauley
尽管两栖动物被广泛认为是多面性捕食者，但它们表现出多样化的牙齿形状和牙列模式，这可能表明饮食专业化对牙齿形态进化的影响。很少有研究分析两栖动物的牙齿形态和饮食(即猎物)之间的关系，现有的研究具有很高的推测性。我们以独立于系统发育的方式研究了火蜥蜴牙齿的进化以及牙齿形态和饮食之间的关系。我们利用3科23种火蜥蜴的系统发育图，首先分析了牙齿形态的分化及其与系统发育的关系，其次分析了牙齿形态与食物多样性的关系。我们在R使用了电子扫描显微镜和空间进化与生态分析(SEEVA)和系统发育广义最小二乘回归的统计比较方法。我们的结果表明，在主要的系统发育分裂上，牙齿的形态存在显著的差异。此外，牙齿形态和饮食多样性之间存在显著的、系统发育上独立的关系。饮食和牙齿形态之间的关系不仅反映了进化史，而且还反映了饮食的专业化程度，表明牙齿形态的进化与火蜥蜴的饮食具有适应性。
Despite being widely regarded as generalist predators, amphibians exhibit a diversity of tooth shapes and dentition patterns, which may indicate the influence of dietary specialization on the evolution of tooth morphology. Very few studies have analysed the relationship between tooth morphology and diet (i.e., prey items) in amphibians, and those existing studies are highly speculative. We investigated the evolution of salamander teeth and the relationship between tooth morphology and diet in a phylogenetically independent fashion. We used a phylogeny of 23 species of salamander representing three families (Ambystomatidae, Plethodontidae, and Salamandridae) to, first, analyse the divergence of tooth morphology and its relationship to phylogeny and, second, to analyse the relationship between tooth morphology and diet diversity. We used electron scanning microscopy and a statistical comparative approach using Spatial Evolutionary and Ecological Analysis (SEEVA) and phylogenetic generalized least-squares regression in R. Our results indicated significant divergence in tooth morphology at major phylogenetic splits. Moreover, there was a significant, phylogenetically independent relationship between tooth morphology and diet diversity. The relationship between diet and tooth morphology indicates not only a reflection of phylogenetic history, but also a degree of dietary specialization, indicating that evolution in tooth morphology has had an adaptive aspect in relation to salamander diet.