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Population genetics of Pampus echinogaster along the Pacific coastline of China: Insights from CR and microsatellite molecular markers
Genetic variation among seven populations of Pampus echinogaster collected from the coastal waters of China along the northwest Pacific Ocean was investigated based on the mitochondrial control region and microsatellite molecular markers. The results showed a high level of genetic diversity that is mainly related to the life history traits and diverse habitat environments of this species, ensuring rapid population growth, reducing the selection pressure exerted by the natural environment and thereby creating conditions for the accumulation of genetic mutations and diversity. Analysis of the genetic structure and migration of P. echinogaster revealed weak genetic differentiation among populations, with an absence of a phylogeographic structure; this finding indicates relatively high genetic homogeneity that may be associated with a recent population expansion event. The complex migratory ability and high dispersal of ichthyoplankton as well as China’s offshore circulation may play major roles in shaping the existing genetic structure of P. echinogaster. Unlike the results obtained for stock division in conventional fisheries, the present study found no significant differences among the P. echinogaster populations, and all the populations were panmictic. Therefore, in addition to taking into account conventional fishery stocks, a comprehensive assessment should be conducted by considering the phylogenetic structures among different populations.
MF17218 Accepted 24 November 2017
© CSIRO 2017