Population genetic structure of chub mackerel Scomber japonicus in the Northwestern Pacific inferred from microsatellite analysis

Abstract

Marine pelagic fishes are usually characterized by subtle but complex patterns of genetic differentiation, which are influenced by both historical process and contemporary gene flow. Genetic population differentiation of chub mackerel, Scomber japonicus, was examined across most of its range in the Northwestern Pacific by screening variation of eight microsatellite loci. Our genetic analysis detected a weak but significant genetic structure of chub mackerel, which was characterized by areas of gene flow and isolation by distance. Consistent with previous estimates of stock structure, we found genetic discontinuity between Japan and China samples. Local-scale pattern of genetic differentiation was observed between samples from the Bohai Sea and North Yellow Sea and those from the East China Sea, which we ascribed to differences in spawning time and migratory behavior. Furthermore, the observed homogeneity among collections of chub mackerel from the East and South China Seas could be the result of an interaction between biological characteristics and marine currents. The present study underlies the importance of understanding the biological significance of genetic differentiation to establish management strategies for exploited fish populations.

Fine‐scale population structure of Collichtys lucidus populations inferred from microsatellite markers

“…In the present study, C. lucidus populations from Chinese coastal waters showed lower genetic diversity ( H e = 0.445–0.542; H o = 0.392–0.539; PIC = 0.268–0.684) than the other sciaenid species, L. crocea (Wu, Liu, Cai, Ye, & Wang, ) and L. polyactis (Li, Han, Song, & Gao, ). Compared with other reported marine fishes (Cheng, Yanagimoto, Song, & Gao, ; Kasapidis & Magoulas, ; Show, Turan, Wright, O'connell, & Carvalho, ), these genetic parameters reflected moderate levels of polymorphism for C. lucidus . Lin et al () thought that overfishing and declining resources in the Zhoushan waters may be responsible for that populations' lower genetic diversity.…”

“…(Wu, Liu, Cai, Ye, & Wang, 2011) and L. polyactis (Li, Han, Song, & Gao, 2013). Compared with other reported marine fishes (Cheng, Yanagimoto, Song, & Gao, 2015;Kasapidis & Magoulas, 2008;Show, Turan, Wright, O'connell, & Carvalho, 1999), these genetic parameters reflected moderate levels of polymorphism for C. lucidus. Lin et al (2011)…”

High genetic connectivity and Population Expansion of Scomber japonicus in the Northern Humboldt Current System revealed by mitochondrial D-Loop region sequences

“…It is also necessary to conduct studies using nuclear markers with a multilocus approach. For example, the use of several microsatellite loci available for this species (Yagishita & Kobayashi 2008, Cha et al 2010 would allow a better resolution for the detection of population units in the Southeast Pacific, as it has been done in the Northwest Pacific , Cheng et al 2015. The creation of time series based on a panel of microsatellites at the same sampling sites to monitor changes in allele frequencies and to estimate effective population sizes (Ne) would be very informative for management purposes, e.g.…”

“…Based on mitochondrial cytochrome b sequences, a moderate genetic differentiation was also found between South and East China Seas, which was attributed to sea level fluctuations during Late Pleistocene (Zhu et al 2014). However, based on eight microsatellite loci, a genetic homogeneity was observed between samples from the South and East China Seas, coupled to weak but significant genetic structure between samples of China and Japan (Cheng et al 2015). Using sequences of the mitochondrial control region, no genetic differentiation was found along the Chinese coast, but a significant structure was observed between populations of China and Japan, which was attributed to an isolation during Late Pleistocene (Yan et al 2015).…”

Research Article Isolation and characterization of polymorphic microsatellite markers for the chub mackerel (Scomber japonicus) and cross-species amplification in the blue mackerel (S. australasicus).

“…Furthermore, some of these microsatellite markers developed for Scomber species have been successfully used for amplification in other related species (Tang et al, 2009;Divya et al, 2016). However, it is not very sufficient, and some locus-by-population tests exhibited significant departure from Hardy-Weinberg equilibrium (HWE) (Cheng et al, 2015). So it is necessary to isolate more microsatellite markers for the utility of the population genetic study.…”