基于28S rDNA的南海刺长腹剑水蚤(Oithona setigera)种群遗传多样性研究
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摘要
长腹剑水蚤属是海洋中小型浮游动物中最为丰富的类群之一,在生物地理学与海洋生态学研究中均具有重要地位。本研究基于28S rDNA分析了南海长腹剑水蚤属中较为常见的刺长腹剑水蚤Oithona setigera的单倍型多样性和种群遗传结构。结果显示, 792bp长度的核苷酸片段中,碱基G+C的平均含量为58.2%,高于A+T含量(41.8%)。种群平均遗传距离Φ_(ST)为0.011。在22个种群共计186个个体中,发现了28个单倍型,其中单倍型H10在21个种群中均被发现,最远距离超过1000km,说明刺长腹剑水蚤可以实现远距离的扩散且受到南海海流影响。Mantel检验结果显示,刺长腹剑水蚤种群遗传距离和地理距离无线性相关性(R=–0.04615, P=0.678); RDA变差分解结果显示,空间变量全模型对种群遗传结构的解释率为53.3%,结合种群平均遗传距离Φ_(ST)为0.011,我们判断目前观测到的刺长腹剑水蚤的种群遗传结构可能由历史上种群扩展带来的拓殖隔离造成。
Oithona is one of the most abundant species of small and medium zooplankton in the ocean, and plays an important role in marine biogeographic genetics and ecology research. In this study, we employed 28 S rDNA to analyze the population genetic structure and haplotype pattern of the most common species(Oithona setigera) in the South China Sea. A dataset of792 bp in length sequences was obtained. The average contents of G+C(58.2%) were significantly higher than those of A+T(41.8%) in the fragment. A total of 28 haplotypes were defined from 186 individuals, of which the dominant haplotype H10 was found in 21 populations. The largest distance between two sampling sites harboring this haplotype is more than 1000 km,indicating Oithona setigera can achieve long distance disperse and be affected by ocean currents. The Mantel test showed that there was no linear correlation between the genetic distance and geographical distance(R= –0.04615, P=0.678); the RDA(redundancy analysis) results indicated space factor significantly affect the population genetic structure rather than environmental factors. The population genetic structure of Oithona setigera may be caused by colonization events followed by demographic expansions.
Oithona is one of the most abundant species of small and medium zooplankton in the ocean, and plays an important role in marine biogeographic genetics and ecology research. In this study, we employed 28 S rDNA to analyze the population genetic structure and haplotype pattern of the most common species(Oithona setigera) in the South China Sea. A dataset of792 bp in length sequences was obtained. The average contents of G+C(58.2%) were significantly higher than those of A+T(41.8%) in the fragment. A total of 28 haplotypes were defined from 186 individuals, of which the dominant haplotype H10 was found in 21 populations. The largest distance between two sampling sites harboring this haplotype is more than 1000 km,indicating Oithona setigera can achieve long distance disperse and be affected by ocean currents. The Mantel test showed that there was no linear correlation between the genetic distance and geographical distance(R= –0.04615, P=0.678); the RDA(redundancy analysis) results indicated space factor significantly affect the population genetic structure rather than environmental factors. The population genetic structure of Oithona setigera may be caused by colonization events followed by demographic expansions.
引文
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黄琦,徐少林,徐磊,等,2017.广东流溪河水库盔型溞(Daphnia galeata)休眠种群与现生种群的单倍型多样性和遗传分化[J].湖泊科学,29(5):1209-1216.HUANG QI,XUSHAOLIN,XU LEI,et al,2017.Haplotype diversity and genetic differentiation of dormant and active populations of Daphnia galeata in Liuxihe reservoir of Guangdong Province,southern China[J].Journal of Lake Sciences,29(5):1209-1216(in Chinese with English abstract).
李纯厚,贾晓平,蔡文贵,2004.南海北部浮游动物多样性研究[J].中国水产科学,11(2):139-146.LI CHUNHOU,JIAXIAOPING,CAI WENGUI,2004.Diversity of marine zooplankton in the north of South China Sea[J].Journal of Fishery Sciences of China,11(2):139-146(in Chinese with English abstract).
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孙柔鑫,王彦国,连光山,等,2014.海南岛西北沿岸海域浮游桡足类的分布及群落特征[J].生物多样性,22(3):320-328.SUN ROUXIN,WANG YANGUO,LIAN GUANGSHAN,et al,2014.Distribution and community characteristics of planktonic copepods in the northwest coastal waters off Hainan Island[J].Biodiversity Science,22(3):320-328(in Chinese with English abstract).
田志富,2012.基于RDA的白洋淀浮游植物群落结构动态特征分析[D].保定:河北大学.TIAN ZHIFU,2012.Structure and dynamics of phytoplankton community based on the redundancy analysis(RDA)[D].Baoding:Hebei University(in Chinese with English abstract).
王敏晓,2010.分子标记在中国近海浮游桡足类研究中的应用[D].青岛:中国科学院研究生院(海洋研究所).WANGMINXIAO,2010.Application of molecular markers to the researches on pelagic copepods in the Chinese coastal regions[D].Qingdao:The Graduate School of Chinese Academy of Sciences(in Chinese with English abstract).
王兴霞,徐磊,王亮根,等,2018.基于COI基因序列的长腹剑水蚤系统进化关系[J].海洋学报,40(6):92-103.WANGXINGXIA,XU LEI,WANG LIANGGEN,et al,2018.Molecular phylogenetic of Oithona based on COI sequence[J].Haiyang Xuebao,40(6):92-103(in Chinese with English abstract).
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薛亚东,李丽,吴巩胜,等,2011.景观遗传学:概念与方法[J].生态学报,31(6):1756-1762.XUE YADONG,LI LI,WUGONGSHENG,et al,2011.Concepts and techniques of landscape genetics[J].Acta Ecologica Sinica,31(6):1756-1762(in Chinese with English abstract).
杨海军,刘秦玉,1998.南海海洋环流研究综述[J].地球科学进展,13(4):364-368.YANG HAIJUN,LIU QINYU,1998.Asummary on ocean circulation study of the South China Sea[J].Advance in Earth Sciences,13(4):364-368(in Chinese with English abstract).
张才学,龚玉艳,王学锋,等,2011.湛江港湾浮游桡足类群落结构的季节变化和影响因素[J].生态学报,31(23):7086-7096.ZHANG CAIXUE,GONG YUYAN,WANGXUEFENG,et al,2011.The effects of season and environmental factors on community structure of planktonic copepods in Zhanjiang Bay,China[J].Acta Ecologica Sinica,31(23):7086-7096(in Chinese with English abstract).
张武昌,赵楠,陶振铖,等,2010.中国海浮游桡足类图谱[M].北京:科学出版社:800.ZHANG WUCHANG,ZHAO NAN,TAO ZHENCHENG,et al,2010.An illustrated guide to marine planktonic copepods in China seas[M].Beijing:Science Press:800(in Chinese).
赵静,孙洋,谭永安,等,2014.基于COI及28S rDNA序列分析的扶桑绵粉蚧地理科群的遗传分化研究[J].棉花学报,26(2):130-137.ZHAO JING,SUN YANG,TAN YONG’AN,et al,2014.Genetic differentiation among different geographic populations of Phenacoccus solenopsis based on sequences of COI and 28S r DNA[J].Cotton Science,26(2):130-137(in Chinese with English abstract).
朱伟军,孙照渤,齐卫宁,1997.南海季风爆发及其环流特征[J].南京气象学院学报,20(4):440-446.ZHU WEIJUN,SUNZHAOBO,QI WEINING,1997.South-China-Sea monsoon onset with its circulation structure[J].Journal of Nanjing Institute of Meteorology,20(4):440-446(in Chinese with English abstract).
AJIBOYE O O,YAKUBU A F,ADAMS T E,et al,2011.A review of the use of copepods in marine fish larviculture[J].Reviews in Fish Biology and Fisheries,21(2):225-246.
BAUS E,DARROCK D J,BRUFORD M W,2005.Gene-flow pattern in Atlantic and Mediterranean populations of the Lusitanian sea star Asterina gibbosa[J].Molecular Ecology,14(11):3373-3382.
BARATTI M,GOTI E,MESSANA G G,2005.High level of genetic differentiation in the marine isopod Sphaeroma terebrans(Crustacea Isopoda Sphaeromatidae)as inferred by mitochondrial DNA analysis[J].Journal of Experimental Marine Biology and Ecology,315(2):225-234.
CHEN GANG,2006.Cryptic biodiversity and speciation in marine populations:The holoplankton paradox[J].Journal of Xiamen University(Natural Science),45(S2):68-76.
CASTELIN M,FEUTRY P,HAUTECOEUR M,et al,2013.New insight on population genetic connectivity of widespread amphidromous prawn Macrobrachium lar(fabricius,1798)(Crustacea:Decapoda:Palaemonidae)[J].Marine Biology,160(6):1395-1406.
CORNILS A,WEND-HECKMANN B,HELD C,2017.Global phylogeography of Oithona similis s.l.(Crustacea,Copepoda,Oithonidae)-A cosmopolitan plankton species or a complex of cryptic lineages?[J].Molecular Phylogenetics and Evolution,107:473-485.
COSTA F O,DEWAARD J R,BOUTILLIER J,et al,2007.Biological identifications through DNA barcodes:the case of the Crustacea[J].Canadian Journal of Fisheries and Aquatic Sciences,64(2):272-295.
ELLIS C D,HODGSON D J,DANIELS C L,et al,2017.Population genetic structure in European lobsters:implications for connectivity,diversity and hatchery stocking[J].Marine Ecology Progress Series,563:123-137.
GOETZE E,2003.Cryptic speciation on the high seas;global phylogenetics of the copepod family Eucalanidae[J].Proceedings of the Royal Society of London.Series B:Biological Sciences,270(1531):2321-2331.
GILG M R,HOWARD R,TURNER R,et al,2014.Estimating the dispersal capacity of the introduced green mussel,Perna viridis(Linnaeus,1758),from field collections and oceanographic modeling[J].Journal of Experimental Marine Biology and Ecology,461:233-242.
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