基于线粒体控制区的中国近海竹荚鱼种群遗传结构和种群历史动态分析  

Population genetic structure and historical dynamics of Trachurus japonicus in the China seas based on mitochondrial control region

作　　者：任慧敏 张衡[2] 许莎莎 李圣法[2] 李建生[2] 李治洪[3,4] 何利军[1,2,4] REN Huimin;ZHANG Heng;XU Shasha;LI Shengfa;LI Jiansheng;LI Zhihong;HE Lijun(State Key Laboratory of Estuarine and Coastal Research,East China Normal University,Shanghai 200241,China;East China Sea Fisheries Research Institute,Chinese Academy of Fishery Science,Shanghai 200090,China;School of Geographic Sciences,East China Normal University,Shanghai 200241,China;Institute of Eco-Chongming,East China Normal University,Shanghai 200241,China)

机构地区：[1]华东师范大学河口海岸学国家重点实验室,上海200241 [2]中国水产科学研究院东海水产研究所,上海200090 [3]华东师范大学地理科学学院,上海200241 [4]华东师范大学崇明生态研究院,上海200241

出　　处：《热带海洋学报》2021年第5期36-44,共9页Journal of Tropical Oceanography

基　　金：国家重点研发计划项目(2018YFD0900902、2018YFD0900904);中国科学院战略性先导科技专项(B类)(XDB42030203);上海科委“科技创新行动计划”“一带一路”国际合作项目(18230743200)。

摘　　要：竹荚鱼(Trachurus japonicus)是中国近海主捕鱼种之一,在海洋食物网中扮演了重要角色,然而环境污染和过度捕捞导致其出现种群数量衰退以及个体趋于小型化等现象。为了解中国近海竹荚鱼的种群遗传格局,文章以线粒体DNA控制区为遗传标记研究了东海大陆架、福建近海和南海北部湾竹荚鱼群体的遗传结构以及种群历史动态。结果表明,中国近海竹荚鱼整体呈现高单倍型多态性(H_(d)=0.998±0.001)和高核苷酸多态性(π=0.01259±0.00041)的遗传多样性特征。单倍型网络图呈现为星形辐射状的单一谱系,利用最大似然法构建的系统进化树也未发现谱系分化。不同海区地理群体的分子方差分析显示东海群体和南海北部湾群体间无遗传分化,遗传变异主要来源于群体内部(99.39%)。中性检验和核苷酸歧点分布分析结果暗示各海区竹荚鱼群体(东海、南海北部湾)以及整个群体均经历过近期的种群扩张。中国近海竹荚鱼群体呈现为遗传均匀的种群结构,可以作为一个单一的种群加以管理,人类高强度捕捞压力尚未影响其种群恢复潜力。As a dominant fishing species,Trachurus japonicus plays an important role in marine food web.However,T.japonicus experienced rapid collapse in population size and decrease in body size due to environmental pollution and overfishing.To uncover evolutionary influence of anthropic activities on marine species in the China seas,we examined genetic structure and population historical dynamics of T.japonicus based on mitochondrial DNA control region.The results were shown in the following:1)High haplotype diversity(H_(d)=0.998±0.001)and high nucleotide diversity(π=0.01259±0.00041)of T.japonicus were observed in the study areas;2)A single star-like bursting lineage was identified in the reconstructed haplotypes network and phylogenetic tree based on maximum likelihood method;3)Genetic variation of T.japonicus occurred mainly within the populations(99.39%)instead of among different geographic populations according to analyses of molecular variance,and no significant genetic differentiation was observed among the East China Sea shelf,coastal Fujian and Beibu Gulf populations;4)Recent demographic expansions in the East China Sea shelf,coastal Fujian province,Beibu Gulf and overall populations were consistently suggested by neutral tests and mismatch distribution analysis.Thus,T.japonicus can be managed as a single and genetic homogeneous population in the China seas.Even if high fishing pressure had been kept on T.japonicus during the past several decades,strong recovery potential for this species could still be expected in the China seas.

关 键 词：竹荚鱼 遗传多态性 种群遗传结构 种群历史动态 线粒体控制区 

分 类 号：P735.541[天文地球—海洋生物学]