李氏方法与Farris氏方法产生的分支系统树的比较

中国科学院大学学报

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李氏方法与Farris氏方法产生的分支系统树的比较

秦廷奎, 段宇

收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:1993-01-10 发布日期:1993-01-10
通讯作者: 秦廷奎

Comparison of the Cladograms Produced by Li's Method and Farris' Method

Qin Ting-kui, Duan Yu

Received:1900-01-01 Revised:1900-01-01 Online:1993-01-10 Published:1993-01-10
Contact: Qin Ting-kui

摘要/Abstract

摘要：

中值淘汰法的主要目的是为了打破现代分支系统学中采用最简原理所带来的不确定性僵局。然而，在两个或两个以上分类单元都具有相同衍进指数的情况下，该方法也能不止产生一个分支系统树，因为没有一个客观标准来确定应该先连接哪一个分类单元，而连接的先后顺序不同，就会产生不同的分支系统树。中值淘汰法的作者认为，该法产生的结果不用简约性来判定。但是，该法也能构成最简约的分支系统树。本文还对应用中值淘汰法所面临的问题作了讨论。

关键词: 白粉藤属, 泥炭藓属, 分支系统学分析, 李氏方法, 中值淘汰法, Farris 氏方法

Abstract:

In order to avoid producing many equally most parsimonious trees,

Li (1990) developed a new cladistic method, the Median Elimination

Series (MES), to construct a single cladogram for a given data set. However, we

found that Li's method can produce more than one tree if two or more taxa have

the same advancement index (which is the total number of apomorphies for a

taxon in a given data set), because there is no objective method to decide which

taxon should be connected first and different orders of connection can produce

different trees.

Li claimed that the result produced by his method did not apply the principle

of simplicity (parsimony). Nevertheless, Zhang (1991) recognised that Li's meth-

od actually accepted the principle of parsimony. Here we demonstrated that Li's

method also can produce the minimum-length trees.

We conclude that Li's method could produce more than one tree and the tree(s)

may be the minimum-length possible. However, the length of tree(s) depends

on the order of connection of the taxa. The major problems in using Li's method

are discussed.

Key words: Cissus, Sphagnum, Cladistic analysis, Li's method, Median Elimination Series (MES), Farris’ method

秦廷奎, 段宇. 李氏方法与Farris氏方法产生的分支系统树的比较[J]. 中国科学院大学学报.

Qin Ting-kui, Duan Yu. Comparison of the Cladograms Produced by Li's Method and Farris' Method[J]. .

[1]	赵铁桥. 分支格局、组份分析与中值淘汰法[J]. 中国科学院大学学报, 1997, 35(1): 88-96.
[2]	张奠湘. 简约性，极性分析及中值淘汰法——与李朝銮先生商榷[J]. 中国科学院大学学报, 1991, 29(3): 283-287.
[3]	何小兰, 敖志文. 中国东北泥炭藓植物的分支系统学分析[J]. 中国科学院大学学报, 1991, 29(2): 131-141.
[4]	李朝銮. 一个新的分支系统分析方法，中值淘汰法[J]. 中国科学院大学学报, 1990, 28(1): 34-53.

李氏方法与Farris氏方法产生的分支系统树的比较

Comparison of the Cladograms Produced by Li's Method and Farris' Method

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