Evolutionary history and phylogenetic relationship between Auxis thazard and Auxis rochei inferred from COI sequences of mtDNA.
Tunas of the genus Auxis are cosmopolitan species and the smallest members of the tribe Thunnini, the true tunas. In the present study, COI sequences of mtDNA were employed to examine the evolutionary history and phylogenetic relationship between A. thazard and A. rochei. A total of 29 COI sequences were retrieved from NCBI. Historic demographic analyses of sequence data showed that A. thazard has undergone sudden population expansion in the past while population size of A. rochei has been remain constant for long period. Non-significant value of Tajimas's D (P = 0.22400) and Fu's FS (P = 0.21400) test fail to reject the null hypothesis of neutral evolution for A. rochei. Phylogenetic analyses of nucleotide sequences demonstrated separate clusters for both species and are strongly supported by 98% bootstrap value. The results of the present study suggest the recent founding of A. thazard in world ocean while A. rochei represents the ancestral species.
['Kumar|Girish|G|', 'Kunal|Swaraj Priyaranjan|SP|', 'Shyama|S K|SK|']
D000818:Animals D001483:Base Sequence D004272:DNA, Mitochondrial D019143:Evolution, Molecular D029941:Fish Proteins D010802:Phylogeny D013045:Species Specificity D014413:Tuna
evolutionary history phylogenetic relationship Auxis thazard Auxis rochei COI sequences mtDNA tuna population expansion nucleotide sequences bioinformatics diagnostic markers