中国近海外来囊藻(Colpomenia peregrina)种群遗传多样性研究  

Population genetic diversity of Colpomenia peregrina along the coast of China

作　　者：宋小含 孙忠民[4] 胡自民[1,2] 段德麟 SONG Xiao-han;SUN Zhong-min;HU Zi-min;DUAN De-lin(Key Laboratory of Experimental Marine Biology,Center for Ocean Mega-Science,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;Laboratory for Marine Biology and Biotechnology,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266071,China;University of Chinese Academy of Sciences,Beijing 100049,China;Department of Marine Organism Taxonomy and Phylogeny,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China)

机构地区：[1]中国科学院海洋研究所海洋大科学研究中心实验海洋生物学重点实验室,山东青岛266071 [2]青岛海洋科学与技术试点国家实验室海洋生物学与生物技术功能实验室,山东青岛266071 [3]中国科学院大学,北京100049 [4]中国科学院海洋研究所海洋生物分类与系统演化实验室,山东青岛266071

出　　处：《海洋科学》2020年第1期89-96,共8页Marine Sciences

基　　金：国家自然科学基金项目(41761144057)~~

摘　　要：外来囊藻(Colpomeniaperegrina)是一种在潮间带分布广泛的褐藻,它能附着在牡蛎壳上进行跨海区扩散,因而是研究生物多样性变动和生物地理格局形成的良好模型。外来囊藻在中国沿海虽有分布,但关于其种群遗传多样性和分化研究的报道尚为空白。本研究采集了中国近海13个外来囊藻种群样本。通过扩增301条线粒体cox3序列,发现了26个单倍型;通过重建单倍型网络图和基于最大似然法与贝叶斯法重建系统进化树,发现外来囊藻种内遗传多样性较高, 13个种群划分为3个遗传世系,其中浙江南麂列岛的7个种群组成遗传世系A,辽宁和山东的样本则分化为遗传世系B和C。中国近海外来囊藻的这种种群遗传结构可能源于更新世末次盛冰期黄渤海、东海边缘海的环境变化和海平面的大幅下降。遗传世系A具有的较高单倍型多样性,其原因可能是南麂列岛独特的地理位置和潮间带环境的共同作用。Colpomenia peregrina is an intertidal brown alga widely distributed throughout the world.Its characteristic adherence to oyster shells,and hence,trans-regional migration,make it an ideal model for the study of patterns of biodiversity and the biogeographic processes of marine species.Colpomenia peregrina is widely prevalent in China;however,knowledge of its population diversity and genetic differentiation is still limited.In this study,we collected C.peregrina samples from 13 localities along the coast of China.We sequenced 301 mitochondrial cox3 sequences that yielded 26 haplotypes.A haplotype network diagram was designed and phylogenetic trees were reconstructed based on maximum likelihood and Bayesian methods.We found high genetic diversity in C.peregrina,and three genetic lineages were identified in 13 populations.Lineage A was specifically restricted to the Nanji Islands,Zhejiang,and lineages B and C were identified in Liaoning and Shandong,respectively.We conclude that such diversity patterns found in C.peregrina may stem from environmental changes and sea level fluctuations in the Yellow-Bohai Seas and East China Sea during the Last Glacial Maximum.The high haplotypic diversity in lineage A may be ascribed to the unique geographical location and intertidal environments of the Nanji Islands.

关 键 词：外来囊藻 线粒体cox3 遗传多样性 世系分化 

分 类 号：Q14[生物学—生态学] X55[生物学—普通生物学]