Genetic Diversity Evaluated through Mt-DNA COI Gene among Population of the Thenus unimaculatus in the Indo West Pacific Region

Abstract

The Thenus species are the most inexpensively significant catch component of demersal trawl shrimp fisheries in the Indo West Pacific region. Previously inadequate specimens of T. unimaculatus identified from India, Thailand, United Arab Emirates, Spain and Mozambique. In the present study genetic diversity of T. unimaculatus based on mt-DNA COI gene sequences in the Indo-West Pacific region evaluated through nucleotide diversity, haplotype and networking analysis of haplotype, mismatch and AMOVA analysis). For the molecular analysis sequences procured from Pakistan and also obtained from Genbank, out of 50 sequences 24 different haplotypes have identified. The haplotype two (n13, 26%) expressed as an ancestral haplotype shared with India, Pakistan and Dubai population. In the current study, the neutrality test Tajima’s D and Fu’s Fs statistics were negative whereas the mismatch distribution analysis expected under the recent expansion model. The value for SSD and Raggedness index were non-significant that indicates that the T. unimaculatus population at range expansion in the Indo Pacific region. Analysis of molecular variance (AMOVA) and FST statistics, contingency analysis of spatial distribution of haplotype frequencies revealed that significant genetic variation among the inhabitant and the gene flow present in the population of T. unimaculatus in the Indo Pacific region.