Abstract
In order to provide valuable guidelines for the conservation of germplasm of Lateolabrax maculatus, the genetic diversity and population structure analysis were evaluated for eight geographic populations along coastal regions of China, using 11 microsatellite DNA markers. The genetic parameters obtained showed that, eight populations can be clustered into two groups, the Northern group and the Southern group, concordant with their geographical positions. The UPGMA tree constructed according to the Nei’s genetic distance along with the structure analysis and discriminant analysis of principal component also supported this result. This might be explained by the geographic separation and the divergent environmental conditions among the populations. It's worth noting that, QD (Qingdao) population from northern area was assigned to the Southern group and showed a close genetic relationship and similar genetic constitution with the southern populations. We speculated that large scales of anthropogenic transportation of wild fries from QD populations to the southern aquaculture areas in history should be the primary cause. The populations from GY (Ganyu), RD (Rudong) and BH (Binhai) had higher genetic diversity and showed limited genetic exchange with other populations, indicating better conservation of the natural resources in these regions. All populations were indicated to have experienced bottleneck events in history.
Highlights
BH populations of L. maculatus suggested that this species could be divided into two groups, i.e. Southern and Northern group according their geographic locations[15]
The highest number of alleles (Ne) (19.7277) value was found in Lama 31 locus, while the Lama 28 locus exhibited the lowest number of Ne (1.861)
As null allele frequencies for each locus computed by EM algorithm were all much less than 0.2 (Table 1), and each L. maculatus populations analyzed in present study consisted of at least 25 individuals, the existence of null alleles was considered not to affect the results of following genetic analysis[6,16,17]
Summary
BH populations of L. maculatus suggested that this species could be divided into two groups, i.e. Southern and Northern group according their geographic locations[15]. These results are insufficient to provide a comprehensive understanding of current genetic background of wild L. maculatus resources in China. The genetic diversity within and among the eight wild L. maculatus geographic populations collected from the coastal regions in China and their population structures were investigated using 11 microsatellite DNA markers. It is expected that this study can largely enrich the genetic information of L. maculatus flocks in China, which can be used for the protection of its wild resources, and for improving the developing sustainable fishing management policy
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