QUANTITATIVE CHARACTERS IN PHYLOGENETIC ANALYSIS
QUANTITATIVE CHARACTERS IN PHYLOGENETIC ANALYSIS
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DOI：
10.1111/j.1096-0031.1989.tb00487.x
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发表时间：
1989-09-01
期刊：
影响因子：
3.6
通讯作者：
CHAPPILL, JA
中科院分区：
文献类型：
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作者：
CHAPPILL, JA
当在低分类水平上分析系统发育关系时，经常出现的情况是，许多可用于区分分类群的特征显示出连续的变异。本文还讨论了利用这些数量性状进行系统发育分析的理论和实践问题。连续数据编码成离散字符的三种方法进行了详细评估：简单的间隙编码，广义间隙编码和段编码，范围编码的一种形式。该方法被应用到一个数据集收集的桉树L“遗产。桃金娘属非正式亚属桃金娘属桃金娘科桃金娘属组。每种方法都能够扭曲类群之间的相对差异，但段编码产生的失真最小，只要字符的变化范围被划分为足够数量的字符状态。连续的数量性状提供的系统发育分析的数据是更嘈杂的比那些由离散的定性特征，因此，只应使用时，数量的定性特征不足以解决的关系。在发现更容易提供信息的性状之前，这种分析的结果应被认为是临时的。
When analysing phylogenetic relationships at low taxonomic levels it is often the case that many of the features that can be used to separate taxa show continuous variation. The theoretical and paractical problems for the use of such quantitative characters in phylogenetic analysis are examined. Three methods of coding continuous data into discrete characters are assessed in detail: simple gap-coding, generalised gap-coding and segment-coding, a form of range-coding. The methods are applied to a data set gathered for Eucalyptus L''Herit. informal subgenus Symphyomyrtus section Maidenaria (Myrtaceae). Each method is capable of distorting relative differences between taxa, but segment-coding produces the least amount of distortion, provided the range of variation of the character is divided into a sufficient number of character states. Continuous quantitative characters provide data for phylogenetic analysis that are more noisy than those provided by discrete qualitative characters and should, therefore, only be used when the number of qualitative characters insufficient for resolution of relationships. The results of such analyses should be recognized as provisional pending the discovery of more readily informative characters.