Oparin M. L. RussiaSaratovSaratov branch of A. N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences, 24 Rabochaya Str., Saratov 410028otis07@mail.ru Author's articles Arthropod abundance on bustard nesting sites in the Saratov Trans-Volga region STATISTICAL ANALYSIS OF THE DISTURBANCE FACTOR INFLUENCE ON THE SPATIAL STRUCTURE FORMATION OF THE GREAT BUSTARD (OTIS TARDA L.) (OTIDIDAE, AVES) POPULATION IN THE TRANS-VOLGA REGION DYNAMICS OF THE ABUNDANCE AND COMMUNITY STRUCTURE OF SMALL MAMMALS IN THE SARATOV TRANS-VOLGA REGION