由16S rDNA序列初步推断鳜类与低等鲈形目鱼类的系统关系

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

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16S rDNA基因片段进行PCR扩增和测序,利用其与GenBank中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。

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.