Contents

Russian Journal of Ecology

Vol. 52, No. 1, 2021

The Possibilities of GBIF Data Use in Ecological Research

N. V. Ivanova and M. P. Shashkov p. 1  abstract

Symbiotic Nitrogen Fixation by Legumes in Alpine Ecosystems: a Vegetation Experiment

M. I. Makarov, V. G. Onipchenko, T. I. Malysheva, A. G. Zuev and A. V. Tiunov p. 9  abstract

Xerophytization of the Flora and Vegetation in the Northern Part of the Volga–Akhtuba Floodplain

A. V. Chuvashov and V. B. Golub p. 18  abstract

Physiological and Biochemical Determinants of Halophyte Adaptive Strategies

O. A. Rozentsvet, V. N. Nesterov, A. A. Kosobryukhov, E. S. Bogdanova and G. S. Rozenberg p. 27  abstract

Spatial and Seasonal Pattern of Fine Root Biomass and Turnover Rate in Different Land Use Systems in Central Himalaya, India

H. Karki, K. Bargali and S. S. Bargali p. 36  abstract

Twenty-five Years of Fire Research in the Temperate Semi-arid Rangelands of Central Argentina: A Synthesis

Daniel Valerio Peláez, Francisco Rubén Blazquez and Romina Jessica Andrioli p. 49  abstract

Dynamics of Zooplankton Composition in the Lower Northern Dvina River and Some Factors Determining Zooplankton Abundance

E. N. Imant and A. P. Novoselov p. 59  abstract

Population Cycles and the Chitty Syndrome

I. A. Kshnyasev and Yu. A. Davydova p. 70  abstract

Communities of Soil Invertebrates near Iska-Shor Hydrogen Sulfide Springs in the Adak Nature Reserve (Komi Republic)

A. A. Taskaeva, T. N. Konakova, A. A. Kolesnikova, A. A. Kudrin and G. L. Nakul p. 76  abstract

Long-term Dynamics of Small Mammal Communities in the Period of Reduction of Copper Smelter Emissions: 1. Composition, Abundance, and Diversity

S. V. Mukhacheva p. 84  abstract

Short Communications

Extraseasonal Egg Laying in the Caucasian Blunt-nosed Viper Macrovipera lebetina obtusa (Reptilia: Serpentes: Viperidae): Sperm Adaptation or Embryo Adaptation?

T. M. Iskenderov p. 94  abstract