Department of Ecology and Evolutionary Biology, 75 N. Eagleville Road, University of Connecticut, Storrs, CT 06268-3043, USA.
Syst Biol. 2022 Jun 16;71(4):921-928. doi: 10.1093/sysbio/syaa068.
If all nucleotide sites evolved at the same rate within molecules and throughout the history of lineages, if all nucleotides were in equal proportion, if any nucleotide or amino acid evolved to any other with equal probability, if all taxa could be sampled, if diversification happened at well-spaced intervals, and if all gene segments had the same history, then tree building would be easy. But of course, none of those conditions are true. Hence, the need for evaluating the information content and accuracy of phylogenetic trees. The symposium for which this historical essay and presentation were developed focused on the importance of phylogenetic support, specifically branch support for individual clades. Here, I present a timeline and review significant events in the history of systematics that set the stage for the development of the sophisticated measures of branch support and examinations of the information content of data highlighted in this symposium. [Bayes factors; bootstrap; branch support; concordance factors; internode certainty; posterior probabilities; spectral analysis; transfer bootstrap expectation.].
如果分子内和谱系历史中所有核苷酸位点都以相同的速率进化，如果所有核苷酸都成比例，如果任何核苷酸或氨基酸以相等的概率进化为任何其他核苷酸或氨基酸，如果可以对所有分类群进行采样，如果多样化以良好间隔发生，并且所有基因片段都具有相同的历史，那么构建树就会很容易。但是，当然，这些条件都不成立。因此，需要评估系统发育树的信息量和准确性。为此历史文章和演讲而开发的研讨会集中讨论了系统发育支持的重要性，特别是针对各个分支的分支支持。在这里，我呈现了一个时间轴，并回顾了系统发生学历史上的重要事件，这些事件为发展分支支持的复杂措施以及检查本次研讨会中突出的数据信息量奠定了基础。[贝叶斯因子；引导；分支支持；一致性因素；内节点确定性；后验概率；谱分析；转移引导期望。]
