Shadrina Elena G. RussiaЯкутскInstitute of Biological Problems of Cryolithozone, SB RAS, 41, Lenin Ave., Yakutsk, Russia, 677890e-shadrina@yandex.ru Author's articles Bioindication of Environmental Quality of the Yakutsk City Administrative Districts on the Basis of Leaf Fluctuating Asymmetry and Seed Quality of the Silver Birch Betula pendula Roth