Journal of Tropical Oceanography ›› 2021, Vol. 40 ›› Issue (5): 25-35.doi: 10.11978/2020119CSTR: 32234.14.2020119

• Marine Biology • Previous Articles     Next Articles

Population genetic structure of Japanese anchovy (Engraulis japonicus) in the Yellow Sea based on mitochondrial control region sequences*

ZOU Congcong1,2,3(), WANG Lijuan1,2, WU Zhihao1,2, YOU Feng1,2()   

  1. 1. Key Laboratory of Experimental Marine Biology, Center for Ocean Mega-Science, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China
    2. Laboratory for Marine Biology and Biotechnology, Pilot National Laboratory for Marine Science and Technology (Qingdao), Qingdao 266237, China
    3. University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2020-10-15 Revised:2021-01-29 Online:2021-09-10 Published:2021-02-09
  • Contact: YOU Feng E-mail:zoucongcong17@mails.ucas.ac.cn;youfeng@qdio.ac.cn
  • Supported by:
    Special Program for Basic Research of the Ministry of Science and Technology of China(2014FY110500);National Marine Genetic Resource Center(2017DKA30470)

Abstract:

Genetic diversity and population structure are important aspects in population dynamics study, and are the basis of fish resources evaluation and protection. Japanese anchovy (Engraulis japonicus) is an important fish species in the China East Coast, which has both ecological and economic values. In this study, the whole sequence of mitochondrial control region was used to analyze the genetic diversity, population genetic structure, and demographic history of its four geographical populations in the Yellow Sea, namely, north of the northern Yellow Sea (NYN), south of the northern Yellow Sea (NYS), north of the southern Yellow Sea (SYN), and central part of the southern Yellow Sea (SYC). A total of 126 haplotypes were detected in 131 samples of the four populations, and their haplotype diversity levels were high, among which the lowest was in the NYS (0.995±0.009) and the highest was in the SYC (1.000±0.014). In all populations, the nucleotide diversity was low (0.010±0.005 to 0.011±0.006). The results of Discriminant Analysis of Principal Components (DAPC) and Fst values indicated that there was no significant segregation among the four populations, and the level of genetic homogeneity among populations was high. There was no obvious population genetic structure, with the large molecular variation within the populations based on the Analysis of Molecular Variance (AMOVA). The Bayesian phylogenetic tree revealed two distinct lineages, which diverged at 0.701 million years ago, dating back to the Pleistocene period. Neutrality test and nucleotide mismatch distribution analyses demonstrated that these two lineages experienced demographic expansions. The effective population of Japanese anchovy in the Yellow Sea decreased significantly at 0.150 million years ago by analyzing the Bayesian skyline.

Key words: Yellow Sea, Engraulis japonicus, genetic diversity, population genetic structure, Pleistocene

CLC Number: 

  • P735.54