Krieger J, Fuerst P A, Cavender T M
Department of Molecular Genetics, The Ohio State University, Ohio, Columbus, 43210, USA.
Mol Phylogenet Evol. 2000 Jul;16(1):64-72. doi: 10.1006/mpev.1999.0743.
The evolutionary relationships of the extant species within the order Acipenseriformes are not well understood. Nucleotide sequences of four mitochondrial genes (12S rRNA, COII, tRNA(Phe), and tRNA(Asp) genes) in North American sturgeon and paddlefish were examined to reconstruct a phylogeny. Analysis of the combined gene sequences suggests a basal placement of the paddlefish with regard to the sturgeons. Nucleotide sequences of all four genes for the three Scaphirhynchus species were identical. The position of Scaphirhynchus based on our data was uncertain. Within the genus Acipenser, the two Acipenser oxyrinchus subspecies were very similar in sequence and found to be basal to the remaining Acipenser species examined. Based on our data, Acipenser transmontanus and Acipenser medirostris were sister taxa, as were Acipenser fulvescens and Acipenser brevirostrum. Comparison of our results with hypotheses of sturgeon relationships proposed by previous authors is presented. The sequence data presented here are phylogenetically useful and provide a solid foundation of genetic information for the North American Acipenseriformes that can be expanded to include Eurasian species to provide a global picture of sturgeon evolution.
目前对鲟形目现存物种之间的进化关系了解尚浅。研究了北美鲟鱼和白鲟四个线粒体基因（12S rRNA、COII、tRNA(Phe)和tRNA(Asp)基因）的核苷酸序列，以重建系统发育树。对组合基因序列的分析表明，相对于鲟鱼而言，白鲟处于基部位置。三种铲鲟属物种的所有四个基因的核苷酸序列均相同。基于我们的数据，铲鲟属的位置尚不确定。在鲟属内，两个尖吻鲟亚种的序列非常相似，且发现它们位于所研究的其余鲟属物种的基部。基于我们的数据，高首鲟和中吻鲟是姐妹分类单元，黄鲟和短吻鲟也是如此。将我们的结果与先前作者提出的鲟鱼关系假说进行了比较。这里呈现的序列数据在系统发育方面很有用，并为北美鲟形目提供了坚实的遗传信息基础，该基础可扩展到包括欧亚物种，以呈现鲟鱼进化的全貌。
