基于DNA条形码对南极Yelcho站周边海域鱼类的种类鉴定  

IDENTIFICATION OF ANTARCTIC FISH FROM THE SEA ADJACENT TO YELCHO STATION BASED ON DNA BARCODING

作　　者：李渊[1] 张然[1] 宋普庆[1] 李海 陈坚[1] 林龙山[1] Li Yuan, Zhang Ran, Song Puqing, Li Hai, Chen Jian, Lin Longshan(The Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, Chin)

机构地区：[1]国家海洋局第三海洋研究所,福建厦门361005

出　　处：《极地研究》2018年第2期194-200,共7页Chinese Journal of Polar Research

基　　金：南北极环境综合考察与评估专项(CHINARE 2016-01-05;CHINARE 2016-03-05)资助

摘　　要：南极鱼类是南极海洋生态系统的重要组成部分,在食物网的物质循环和能量流动中起着重要的作用。利用中国第32次南极考察暨中智第2次联合南极半岛综合科学考察采集Yelcho站周边海域南极鱼类,并基于形态学和DNA条形码技术对其进行种类鉴定。序列相似性结果显示仅2尾鱼类能准确鉴定到种,剩余6尾属于模糊种;结合Gen Bank中的同源序列对其进行系统发育分析,结果显示所有样品能明显分为4个组群,且各物种的最小种间遗传距离均高于该物种的最大种内遗传距离,存在明显的条形码间隙,证明各物种鉴定结果的有效性。8尾样品内存在3个有效种,南极鱼科7尾,裸南极鱼科1尾,在一定程度上反映出Yelcho站周边海域鱼类在物种组成和生物量上均以南极鱼科鱼类为主。As an important part of the Antarctic Ocean ecosystem, Antarctic fish play a role in material cycling and the energy flow within the food web. Individual Antarctic fish specimens were collected from the sea adjacent to Yelcho Station during the 32 nd Chinese National Antarctic Research Expedition, and morphological analysis and DNA barcoding were employed in their identification. After running blast searches in NCBI, sequence similarity results showed that only two individuals were identifiable to the species level, while six individuals were unmatched. Combined with a homologous sequence from Gen Bank, phylogenetic analysis was performed and four groups were unambiguously identified from the NJ tree. There was clear overlap（barcoding gap） between intraspecific and interspecific variabilities in each species, as the smallest interspecific divergences were well below 2%, while the largest intraspecific divergences were above 2%. Three valid species were detected from eight individuals, encompassing seven Nototheniidae fish and one Harpagiferidae fish. Finally, all results further confirmed that notothenioid fish were dominant in terms of species diversity and biomass in the investigated seas.

关 键 词：南极鱼科 DNA条形码 序列相似性 条形码间隙 遗传距离 

分 类 号：S917.4[农业科学—水产科学]