似然比检验和贝叶斯推论在雉科分子系统学中的应用  

THE APPLICATION OF LIKELIHOOD RATIO TESTS AND BAYESIAN INFERENCE IN THE MOLECULAR PHYLOGENY OF PHASIANIDAE

作　　者：张原[1,2] 张正旺[1] 郑楠[1] 

机构地区：[1]北京师范大学生命科学学院,教育部生物多样性与生态工程重点实验室 [2]中国科学院植物研究所系统与进化开放实验室,北京100093

出　　处：《北京师范大学学报（自然科学版）》2003年第2期250-257,共8页Journal of Beijing Normal University(Natural Science)

基　　金：国家自然科学基金资助项目 (3 983 0 0 3 0 )

摘　　要：应用似然比检验和贝叶斯推论进行雉科分子系统学研究 .所用的 56条细胞色素b基因全序列代表了雉科 2 4属 50种以及作为外类群的 6个相关属 .等级制似然比检验表明该数据集的最佳进化模型为GTR +I+G .建立在坚实的统计学基础上的贝叶斯系统树表明雉科可以分为3个分支 .特别是包括角雉、松鸡、火鸡和 gallopheasant等在内的第 3分支的单系群性质得到了充分的支持 .深层分支格局的高分辨率和高支持率说明将雉科划分为雉族和鹑族是人为的 .结果表明 ,似然比检验和贝叶斯推论是分子系统学研究的强有力工具 .Both likelihood ratio tests and Bayesian inference are employed to study the phylogeny of Phasianidae. 56 complete cytochrome b nucleotide sequences are used in the analysis to represent 50 Phasianidae species (24 genera) and 6 related genera as outgroup. Hierarchical likelihood ratio tests show that GTR+ I+G can be the best evolutionary model for the dataset. Bayesian phylogenetic tree, based on a solid statistical foundation, suggestes that Phasianidae could be divided into three clades. Especially, the monophyly of the third clade, including tragopan, grouse, turkey, gallopheasant and allies, is strongly supported. The well resolved and well supported deeper branching pattern indicates that the division of Phasianidae into the tribes of Phasianini and Perdicini is artificial. The result shows that likelihood ratio tests and Bayesian inference are powerful tools in the study of molecular phylogeny.

关 键 词：雉科 分子系统学 似然比检验 贝叶斯推论 进化生物学 假说检验 

分 类 号：Q959.725[生物学—动物学] Q349.5