GENETIC DIVERSITY OF THREADFIN BREAM (Nemipterus hexodon) IN LOWER PART OF SOUTHERN THAILAND
Keywords:
mitochondrial DNA, genetic diversity, Threadfin Bream, Lower SouthernAbstract
Genetic diversity of the Threadfin Bream (Nemipterus hexodon) living in lower part of Southern Thailand were investigated using nucleotide sequence of the mitochondrial DNA in cytochrome oxidase subunit I gene. Fragments of 443 bp of the cytochrome oxidase subunit I gene were sequenced for 80 individuals from 4 localities over most of the species range in the Andaman sea (Satun (21), Krabi (18)) and the Gulf of Thailand (Songkhla (21), Nakhon Si Thammarat (20)). The polymorphic site was 33 indicating that N. hexodon populations living in lower part of Southern Thailand had high levels of genetic diversity. Estimated values of haplotype and nucleotide diversities were 0.687+0.050 and 0.011+0.002, respectively. The analysis of molecular variance (AMOVA) and Pairwise FST test revealed genetic differentiation of N. hexodon between the Andaman sea and the Gulf of Thailand populations. Genetic separation the result from the gene flow disruption between populations of the Gulf of Thailand and the Andaman sea, caused by a geographic barrier like the Malaysian peninsula. Mismatch distribution (SSD, Harpending Raggedness index), neutrality tests (Tajima’s D test, Fu’ Fs test), estimates of population parameters (θ0, θ1) and minimum spanning network (MSN) suggested that N. hexodon might have undergone a population expansion. This study provided basic information that could be used for management this species in lower Southern Thailand.
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