V.V. Anshakova - Ph.D. (Ped), North-Eastern Federal University (Yakutsk). E-mail: anshakоva_v@mail.ru
B.M. Kershengolts - Dr.Sc. (Biol.), Institute for Biological Problems of Cryollithozone, SB (Yakutsk) RAS. E-mail: kerschen@mail.ru