Properties of phylogenetic trees generated by Yule-type speciation models
Properties of phylogenetic trees generated by Yule-type speciation models
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DOI：
10.1016/s0025-5564(00)00061-4
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发表时间：
2001-03-01
影响因子：
4.3
通讯作者：
McKenzie, A
中科院分区：
文献类型：
--
作者：
Steel, M;McKenzie, A
我们研究了一些离散的结构性质的进化树下生成的简单的空模型的物种形成，如Yule模型。这些模型已被用作先验贝叶斯方法的系统发育分析，也来测试有关的物种形成过程的假设。在本文中，我们描述了新的结果下产生的树的三个属性的模型。首先，对于由Yule模型生成的有根树，我们描述了k个物种的随机子集的最近共同祖先的深度（从根的边缘数）上的概率分布。接下来，我们表明，对于圣诞节模型下生成的树，根的近似位置可以从相关的无根树估计，即使是具有大量叶子的树。最后，我们分析了一个生物学动机的Yule模型的扩展，并描述了其分布在树的形状时，物种形成发生在快速爆发。(C)2001 Elsevier Science Inc. All rights reserved.
We investigate some discrete structural properties of evolutionary trees generated under simple null models of speciation, such as the Yule model. These models have been used as priors in Bayesian approaches to phylogenetic analysis, and also to test hypotheses concerning the speciation process. In this paper we describe new results for three properties of trees generated under such models. Firstly, for a rooted tree generated by the Yule model we describe the probability distribution on the depth (number of edges from the root) of the most recent common ancestor of a random subset of k species. Next we show that, for trees generated under the Yule model, the approximate position of the root can be estimated from the associated unrooted tree, even for trees with a large number of leaves. Finally, we analyse a biologically motivated extension of the Yule model and describe its distribution on tree shapes when speciation occurs in rapid bursts. (C) 2001 Elsevier Science Inc. All rights reserved.