THYMALLUS ARCTICUS YALUENSIS IS A SYNONYM OF T. GRUBII BY MITOCHONDRIAL CONTROL REGION SEQUENCES ANALYSIS
Author of the article:MA Bo, HUO Tang-Bin, JIANG Zuo-Fa
Author's Workplace：Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China
Key Words：Thymallus, T. arcticus yaluensis, T. grubii, status validity, D-loop, molecular phylogeny.
26 complete mitochondrial control region sequences of Thymallus arcticus yaluensis and T. grubii were sequenced, to investigate the validity of T. a. yaluensis, and constructed the phylogenetic relationships of Thymallus (T.) tugarinae, T. a. arcticus and T. thymallus were used as outgroups. The results showed the average K 2-P genetic distances between T. a. yaluensis and the four populations of T. grubii (Huma reiver, Gan River, Mudan River and Songhua River population) ranged from 0.007 to 0.015, and the average genetic distances among the four populations of T. grubii ranged from 0.004 to 0.015, thus both showing significant lower between different Thymallus (0.046-0.062) .The phylogenetic trees estimated by neighbor-joining (NJ) and maximum parsimony (MP) methods indicated that the individuals of T. a. yaluensis failed to form monophyletic clades, and not a subsepecies of T. a. arcticus, but formed monophyletic clades with T. grubii. These results revealed that T. a. yaluensis should not be considered a valid species, but is a synonym of T. grubii, and just a population of T. grubii.