由16S rDNA序列初步推断鳜类与低等鲈形目鱼类的系统关系

为验证鳜类系统分类位置的各种假说，对部分鳜类鱼类线粒体16SrDNA基因片段进行PCR扩增和测序，利用其与GenBank中鳕科以及鲈形目其它科鱼类的同源序列，初步构建了鳜类与部分低等鲈形目鱼类的分子系统关系。结果表明，鳜类为单系类群，但未与绪科聚合成单系群体，与目前假设的暖鲈科、狼鲈科、锯盖鱼群、花鲈等亲缘关系相对较远。由于鳜类为淡水特化类群，系统演化上较晚发生，因而，支持将其独立为一科——鳜科。本研究结果可为理解低等鲈形目鱼类的系统进化关系提供分析资料。

The preliminary phylogenetic relationships of sinipercine fishes and some lower percoids inferred from 16S ribosomal DNA sequences

To test some presumed systematic classifications of sinipercine fishes,16S rDNA gene of some sinipercine fishes were PCR amplified and sequenced,a preliminary phylogenetic relationship of sinipercine fishes and some lower percoids was constructed using the homogenous sequences of 16S rDNA.The results showed sinipercine fishes was a monophyletic group,however,it didn't cluster with Serranidae and didn't show close relationships with Percichthyidae,Moronidae,Centropomii and Lateolabrax.Compared with the studied percoids, sinipercine fishes is a specialized freshwater group and lies at the top of the tree,which may support its rise as an independent family Sinipercidae.Our results may serve as a molecular base for further understanding the phylogeny of lower percoids.