# 编者信息 熊荣川 明湖实验室 xiongrongchuan@126.com http://blog.sciencenet.cn/u/Bearjazz Intraspecific gene evolution cannot always be represented by a bifurcating tree. Rather, population genealogies are often multifurcated, descendant genes coexist with persistent ancestors and recombination events produce reticulate relationships. Whereas traditional phylogenetic methods assume bifurcating trees, several networking approaches have recently been developed to estimate intraspecific genealogies that take into account these population level phenomena. During the past decade, the explosion of molecular techniques has led to the accumulation of a considerable amount of comparative genetic information at the population level. At the same time, recent advances in population genetics theory, especially coalescent theory, have generated powerful tools for the analysis of intraspecific data. These two developments have converted intraspecific phylogenies into useful tools for testing a variety of evolutionary and population genetic hypotheses. Several phylogenetic methods, especially NETWORK (see Glossary) approaches, have been developed to take advantage of the unique characteristics of intraspecific data. In this article, we summarize some population genetics principles, explain why networks are appropriate representations of intraspecific genetic variation, describe and compare available methods and software for network estimation, and give examples of their application 种内基因进化不总能用分叉树来表示。相反，种群谱系通常是多歧分叉的，后代基因与长寿的祖先共存，重组事件产生网状关系。 传统的系统发育方法假设树是分叉的，最近已经开发出几种网络方法来估计种内谱系，将这些种群级别现象考虑进去。不是这些人口层面的现象。 在过去的十年中，分子技术的爆炸性发展导致了在种群水平上积累了大量的比较遗传信息。与此同时，群体遗传学理论的最新进展，特别是溯祖理论，为分析特定种内数据提供了强有力的工具。这两个进步已将种内系统发育转化为检验各种进化变异和种群遗传假说的有用工具。几种系统发育方法，特别是 NETWORK （见词汇表）方法，已被开发出来，以利用种内特定数据的独特特征。在本文中，我们总结了一些群体遗传学原理，解释了为什么网络是种内遗传变异的适当表示，描述并比较了现有的网络估计方法和软件，并举例说明了它们的应用。 Posada D , Crandall K A . Intraspecific gene genealogies: trees grafting into networks . Trends in Ecology and Evolution, 2001, 16(1):0-45.
标签: 种内谱系
