We analyzed the genetic variation across six life periods that composed 3232 samples of a natural population of the Chinese shrimp Fenneropenaeus chinensis in Bohai Bay using 4 SSR (Simple Sequence Repeats) markers. Including the observed number of alleles (N a ), eight genetic variation parameters were introduced to assess the genetic diversity and trace the changing genetic variation in this natural population. The genotype number detected on each locus in each stock ranged from 27 to 503; the detected average allele number was 36.5 per locus, and the PIC values of the 4 SSR loci ranged from 0.909 to 0.954. These all reflected the high variability on these 4 SSR loci. The rates of individual number vs. genotype number (R ig ) on each locus across six life periods showed an increasing tendency, the minimum and maximum change ranges were detected on EN0033 with an R ig value from 1.35 to 2.91 and on locus FCKR002 with an R ig value from 352.00 to 9.50, respectively, which suggested an increase in genotype homogenization over time in 36 the development of the natural population. The genetic differentiation coefficients (F st), ranged from 0.00003 to 0.00206, hinted there was no significant genetic differentiation among 6 stocks. The mainly genetic differentiation contributed 83.83% of the total variation that was detected within individuals also supported the above conclusion. Regarding the genotype percentage, there were five clear instances were detected with decreasing tendency on loci EN0033 and RS0622 in six stocks, which are consistent with a previous finding that an allele on RS0622 was related to WSSV (White Spot Syndrome Virus) resistance in F. chinensis.
Russian Journal of Marine Biology – Springer Journals
Published: Apr 8, 2015
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