Sapanov M. K. RussiaMoscow regionInstitute of Forest Science, Russian Academy of Sciences, 21 Sovetskaya Str., Uspenskoe, Moscow region 143030, Russiasapanovm@mail.ru Author's articles INFLUENCE OF NATURAL AND CLIMATIC FACTORS ON THE NUMBERS OF SAIGAS (SAIGA TATARICA PALL.) (BOVIDAE, ARTIODACTYLA) BETWEEN THE VOLGA AND URAL RIVERS