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中国沿海六个地理群体短蛸的遗传变异研究

, PP. 130-138

Keywords: 地理群体,短蛸,遗传变异

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Abstract:

采用线粒体COI基因测序技术分析了我国沿海重要经济头足类短蛸(Octopusocellatus)6个地理群体的遗传结构及其变异,结果表明我国短蛸资源的遗传多样性相对丰富,在654bp长度的核苷酸片段中共检测到42个多态位点,多态位点比例达6.42%,检测的60个个体中共获23个单倍型,单倍型多样性指数为0.200~0.867,平均核苷酸多样性指数为0.0003~0.0097,平均核苷酸差异数为0.200~6.311,高于多数海洋头足类的遗传变异。对6个群体的遗传结构进行检测表明,我国的短蛸群体间除部分群体外均存在显著的遗传分化(P<0.05),遗传结构基本符合脚踏石模型。聚类分析表明6群体已明显分化为两个类群,一个由大连、青岛、连云港群体组成,另一个由舟山、上海和广州群体组成,两类群间存在20个固定位点核苷酸差异,编码的蛋白质存在2个固定氨基酸残基的差异。两类群的分化系数达0.8602(P<0.01),基因流大大小于1;AMOVA检测显示仅有12.72%的遗传差异存在于群体内部,而87.28%的遗传差异存在于群体间。短蛸遗传变异的研究成果可为今后我国短蛸资源更好的开发和管理提供理论基础。

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