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Topological properties of phylogenetic trees in evolutionary models

机译:进化模型中系统发生树的拓扑特性

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摘要

The extent to which evolutionary processes affect the shape of phylogenetic trees is an importantopen question. Analyses of small trees seem to detect non-trivial asymmetries which are usually ascribedto the presence of correlations in speciation rates. Many models used to construct phylogenetic trees havean algorithmic nature and are rarely biologically grounded. In this article, we analyze the topologicalproperties of phylogenetic trees generated by different evolutionary models (populations of RNA sequencesand a simple model with inheritance and mutation) and compare them with the trees produced by knownuncorrelated models as the backward coalescent, paying special attention to large trees. Our results demon-strate that evolutionary parameters as mutation rate or selection pressure have a weak influence on thescaling behavior of the trees, while the size of phylogenies strongly affects measured scaling exponents.Within statistical errors, the topological properties of phylogenies generated by evolutionary models arecompatible with those measured in balanced, uncorrelated trees.
机译:进化过程影响系统发育树形状的程度是一个重要的开放性问题。对小树的分析似乎检测到了非平凡的不对称性,这通常归因于物种形成率之间存在相关性。用于构建系统树的许多模型具有算法性质,并且很少在生物学上扎根。在本文中,我们分析了由不同进化模型(RNA序列的种群以及具有遗传和突变的简单模型)生成的系统发育树的拓扑特性,并将其与由已知的不相关模型(如向后合并)生成的树进行了比较,并特别注意了大树。我们的结果表明,诸如突变率或选择压力等进化参数对树木的缩放行为影响较小,而系统发育的大小对测得的缩放指数有很大影响。在统计误差内,进化模型生成的系统发育的拓扑特性是兼容的与那些在平衡,不相关的树中进行测量的结果。

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