Different rates of molecular evolution of mitochondrial genes in Baikalian and non-Baikalian amphipods

  • Romanova E.V. 1
  • Sherbakov D.Y. 1
  • 1 Limnological Institute, Siberian Branch of the Russian Academy of Sciences, Ulan-Batorskaya Str., 3, Irkutsk, 664033, Russia
Keywords: Rate of evolution, mitogenome, genetic distances, Baikal


Rates of molecular evolution in eight protein-coding mitochondrial genes from two parallel
lineages of Baikalian amphipods were compared to those in the representatives of gen. Gammarus. In six
genes (Atp6, Cox2, Cox3, Nad1, Nad5, Nad6), there was a significant acceleration in the evolutionary
rate of Baikalian species over those from Gammarus group. Correlation of the absolute rate of base
substitution accumulation and the acceleration was insignificant, that allowed us to propose mostly
adaptive reasons for the effect found.