中国沿海花鲈群体遗传结构分析

Analysis of the Genetic Structure of Spotted Sea Bass (Lateolabrax maculatus) Inhabiting the Chinese Coast

用23个微卫星DNA标记分析了2000年前后北海、威海和舟山花鲈(Lateolabrax maculatus)地理群体(A组)和2006年2个烟台花鲈群体(B组)的遗传结构。A组内各群体Nei氏期望杂合度相似、有轻微遗传分化、属同一自由交配群;A组组内及威海和北海地理群体内存在瓶颈事件。B组内2群体无显著遗传分化,组内及群体A发生过瓶颈事件。尽管威海群体与B组2个群体的Nei’s期望杂合度、平均等位基因数相似,遗传距离小,属同一自由交配群,但威海群体与2个烟台群体间的遗传分化达到了显著水平,表明山东半岛沿海花鲈群体遗传结构从2000～2006年已发生一定程度的改变。

The genetic structure of spotted sea bass（Lateolabrax maculatus） inhabiting the Chinese coast was determined with 23 microsatellite DNA markers. The Nei＇s expected heterozygosity of Beihai, Weihai and Zhoushan geographic populations （Group A） was similar to each other. These 3 populations differentiated slightly; however, the individuals collected around year 2000 belonged to a single panmictic group. The bottleneck event was detected in Group A as a whole and in Weihai and Beihai geographic populations. Two Yantai populations（Group B） were genetically identical. The bottleneck event was detected in Group B as a whole and in Population A. Both Nei＇s expected heterozygosity and mean number of alleles of Weihai geographic population were similar to those of 2 populations of Group B. The genetic distance between Weihai population and 2 populations of Group B was short. The individuals of Weihai geographic population and those of 2 populations of Group B belonged to a single panmictic group. However, Weihai geographic population differentiated from the 2 populations of Group B significantly. These observations indicated that the genetic structure of the spotted sea bass along the coast of the Shandong Peninsula was changed to a certain extent from year 2000 to 2006.