Journal of Tropical Oceanography ›› 2019, Vol. 38 ›› Issue (3): 89-97.doi: 10.11978/2018112CSTR: 32234.14.2018112

Special Issue: 南海专题

• Marine Biology • Previous Articles     Next Articles

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 E-mail:feiyanegg@163.com
  • 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)

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

CLC Number: 

  • Q179.1