热带海洋学报 ›› 2019, Vol. 38 ›› Issue (3): 89-97.doi: 10.11978/2018112CSTR: 32234.14.2018112

所属专题: 南海专题

• 海洋生物学 • 上一篇    下一篇

基于28S rDNA的南海刺长腹剑水蚤(Oithona setigera)种群遗传多样性研究

季莹莹1,2,徐磊2,黎红2,王亮根2,杜飞雁2()   

  1. 1. 上海海洋大学海洋科学学院, 上海 201306
    2. 中国水产科学研究院南海水产研究所, 广东省渔业生态环境重点实验室, 农业部南海渔业资源开发利用重点实验室, 广东 广州 510300
  • 收稿日期:2018-10-25 修回日期:2018-12-20 出版日期:2019-05-20 发布日期:2019-06-17
  • 通讯作者: 杜飞雁
  • 作者简介:季莹莹(1994—), 女, 江苏省南京市人, 硕士研究生, E-mail:15705117350@163.com
  • 基金资助:
    国家自然科学基金(41406188);中国水产科学研究院南海水产研究所中央级公益性科研院所基本科研业务费专项资金(2017YB26、2016TS24)(2017YB26);中国水产科学研究院南海水产研究所中央级公益性科研院所基本科研业务费专项资金(2017YB26、2016TS24)(2016TS24)

Genetic structure of Oithona setigera from South China Sea based on 28S rDNA gene

Yingying JI1,2,Lei XU2,Hong LI2,Lianggen WANG2,Feiyan DU2()   

  1. 1. College of Marine Sciences, Shanghai ocean university, Shanghai 201306, China
    2. South China Sea Fisheries Research Institute, Guangdong Provincial Key Laboratory of Fishery Ecology and Environment, Guangzhou 510300, China
  • Received:2018-10-25 Revised:2018-12-20 Online:2019-05-20 Published:2019-06-17
  • Contact: Feiyan DU
  • Supported by:
    National Natural Science Foundation of China(41406188);South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Scientific Research Funds for Central Non-profit Institutes(2017YB26);South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Scientific Research Funds for Central Non-profit Institutes(2016TS24)

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ΦST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ΦST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。

关键词: 刺长腹剑水蚤, 28S rDNA, 南海, 遗传分化, 空间隔离

Abstract:

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 28S rDNA to analyze the population genetic structure and haplotype pattern of the most common species (Oithona setigera) in the South China Sea. A dataset of 792 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.

Key words: Oithona setigera, 28S rDNA, South China Sea, genetic differentiation, isolation-by-distance

中图分类号: 

  • Q179.1