PHYLOGENETIC RELATIONSHIPS OF AMUR STURGEON ACIPENSER SCHRENCKII BRANDT, 1869 BASED ON 18S RDNA SEQUENSING DATA
K. V. Rozhkovan,1 G. N. Chelomina,1 S. A. Ivanov 2
1 Institute of Biology and Pedology Far East Brunch of RAS and 2 FGU Amurribvod, Vladivostok;
e-mail: 1 chelomina@ibss.dvo.ru,
2 amursturgcon@mail.ru
The analysis of phylogenetic relationships based on 18S rDNA sequences of Amur sturgeon Acipenser schrenckii Brandt, 1869 with other
acipenseriform species was performed in this study. Complete sequences (1746 b. p.) in seven individual clones of A. schrenckii 18S rRNA were determined.
Mutation profile of Amur sturgeon 18S rDNA demonstrated high similarity with that of Lake Sturgeon A.fulvescens. Both presumably functional sequence and
the specific mutation (insertion of adenine after position 658) of Amur sturgeon 18S rDNA were identified by structural-functional analyses. Phylogenetic
reconstructions performed using different methods (NJ, MP, ML and Bayesian) support monophyly of the genus Acipenser and point to: 1) closer relationships
Amur sturgeon with sterlet, than Baltic sturgeon, which is in agreement with Artyukhin's eco-morphological classification (Artyukhin, 1995, 2006); 2) sufficiently high
differentiation between North-American (A.fulvescens) and Eurasian (A. schrenckii, A. ruthenus and A. sturio) sturgeons.
Key words: 18S rDNA, Amur sturgeon, phylogeny, Acipenseriformes
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