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基于线粒体COI和16SrRNA基因序列,对中国沿海2种文昌鱼(Branchiostomasp.)的6个群体(厦门、湛江和茂名群体为白氏文昌鱼Branchiostoma belcheri,中国日照、青岛和威海群体为日本文昌鱼B.japonicum)进行了遗传多样性研究。结果表明:2种文昌鱼种群遗传多样性均处于较高水平,文昌鱼种内不同地理群体间的遗传分化不显著,但2种文昌鱼间存在显著的遗传分化;群体历史动态分析结果提示2种文昌鱼可能经历过群体扩张事件(白氏文昌鱼:0.238～0.587Myr;日本文昌鱼:0.339～1.043Myr);茂名群体和威海群体均表现出较高的遗传多样性水平,提示这2个群体可能分别为白氏文昌鱼和日本文昌鱼的较原始群体。
Based on the mitochondrial COI and 16S rRNA gene sequences, six populations of two species of Branchiostomasp. (Xiamen Branch, Zhanjiang and Maoming populations were Branchiostoma belcheri, Rizhao, Qingdao and Weihai were collected from Japanese amphioxus B . japonicum) conducted a genetic diversity study. The results showed that the genetic diversity of two species of amphioxus was at a high level, while the genetic differentiation among different species of amphioxus was not significant, but there was a significant genetic differentiation between the two amphioxus species. The results of population history analysis indicated that 2 Species of amphioxus may have experienced population expansion events (Cruciferae: 0.238 ~ 0.587Myr; Japanese amphioxus: 0.339 ~ 1.043Myr); Maoming population and Weihai population showed higher levels of genetic diversity, suggesting that the two The groups may be the more primitive populations of C. sinensis and Japanese amphioxus, respectively.