Abstract
Pampusargenteus is a broadly exploited pelagic fish species, commonly misidentified as Pampusechinogaster. Genetic variation and population structure in Pampusargenteus was studied based on seven microsatellite loci. The observed high average allele number, heterozygosity values, and polymorphism information content of P.argenteus suggested high genetic diversity. No population genetic differentiation was detected based on the results of pairwise Fst, three-dimensional factorial correspondence analysis (3D-FCA) and STRUCTURE analysis, which implied continuous gene flow. Wilcoxon signed rank tests did not indicate significant heterozygosity excess, and recent genetic bottleneck events were not detected. Coupled with previous mitochondrial DNA results, the findings presented here indicate that high gene flow characterizes the current phylogeographic pattern of the species.
Highlights
Species of the genus Pampus Bonaparte, 1834, are mainly distributed in the Indo-West Pacific Ocean and have a rich landing yield in Kuwait, Iran, India, Malaysia, Thailand, China, Korea and Japan (Jia et al 2004; Divya et al 2017)
The degree of genetic variation is important for the sustainability and evolution of species, and the strong correlation between genetic diversity and overall fitness has been reported (Reed and Frankham 2003; Vandewoestijne et al 2008)
High average number of alleles (NA), heterozygosity values and polymorphism information content (PIC) of P. argenteus were detected by seven microsatellite loci, which is consistent with the mitochondrial DNA results of previous studies (Li et al 2017b)
Summary
Species of the genus Pampus Bonaparte, 1834, are mainly distributed in the Indo-West Pacific Ocean and have a rich landing yield in Kuwait, Iran, India, Malaysia, Thailand, China, Korea and Japan (Jia et al 2004; Divya et al 2017). Among these species, P. argenteus (Euphrasén, 1788) is a broadly exploited pelagic species that has a high economic value because of its highly appreciated taste. Pampus punctatissimus (Temminck & Schlegel, 1845) was regarded as a synonym of P. argenteus by some ichthyologists (Bleeker 1852; Haedrich 1984), while a few researchers recognized differences between these species and provided a redescription of P. punctatissimus with a detailed morphological comparison with P. argenteus (Liu and Li 1998; Yamada et al 2009; Nakabo 2013)
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