Main Stages of Woody Vegetation Development in the Yamal Peninsula in the Holocene R. M. Hantemirov and S. G. Shiyatov p. 141 Variation in the Number of Cotyledons in Scotch Pine in the East of European Russia A. I. Vidyakin and N. V. Glotov p. 148 Ecological Niches and Synusiae in Meadow Phytocenoses K. A. Kurkin p. 155 Population Structure of Pedunculate Oak in the Middle Volga Region I. A. Yakovlev p. 159 Different Strategies of Plant Adaptation to Toxic Environmental Pollution with Heavy Metals: An Example of Taraxacum officinale s.l. T. V. Zhuikova, V. N. Pozolotina, and V. S. Bezel’ p. 166 The Karabolka River Contamination with Long-lived Radionuclides as a Result of Their Transport from the Eastern Ural Radioactive Trace and an Industrial Waste Reservoir L. M. Peremyslova, N. G. Safronova, V. A. Baturin, M. V. Ivanitskaya, and V. I. Afonin p. 174 The Timing of Passerine Bird Nesting in the Yamal Peninsula V. K. Ryabitsev, E. A. Polents, N. S. Alekseeva, Yu. A. Tyul’kin, and V. V. Tarasov p. 178 Experience in Improving the Technique for Taking Relative Census of Small Mammals with the Aid of Cylinders and Barriers V. V. Neronov p. 183 Ethological Mechanisms of Population Density Control in Coadaptive Complexes of Ants Zh. I. Reznikova p. 187
Short Communications
New Method for Graphical Representation of the Relationships of Species Diversity and Complex Environmental Gradients V. V. Korzhenevskii p. 193 Seed Germination Ecology of Flowering Rush (Butomus umbellatus L.)
and Its Influence on Subsequent Plant Development G. A. Lukina and V. G. Papchenkov p. 196 Ecological Differentiation and Biological Diversity of Plant Cover in Sverdlovsk Oblast N. N. Nikonova, T. V. Famelis, and E. A. Shurova< p. 199 Monitoring the Toxicity of Natural Waters and Estimating the Degree of Their Purification by the Microbioluminescence Method R. A. Pshenichnov, V. M. Kolotov, N. M. Nikitina, S. A. Kuksina, O. G. Lyalina, and I. L. Shmyrina p. 203 On the Model of Organization of Plant Communities in Intensely Denuded Habitats Yu. V. Korzhenevskaya p. 206 Distribution of Seals in the Region of Shantar Islands in Summer E. I. Sobolevskii p. 209
Critics and Bibliography
Book Review: V. S.Ipatov and L. A. Kirikova. Fitotsenologiya (Phytocenology), St. Petersburg: St. Petersburg Gos. Univ., 1997, 315 p. L. A. Zhukova and N.V. Glotov p. 213
In Memoriam
Professor Vadim Nikolaevich Tikhomirov (January 27, 1932—July 11, 1998) p. 215