Статьи

DYNAMICS OF THE ABUNDANCE AND DEMOGRAPHIC STRUCTURE OF POPULATIONS OF THE SMALL WOOD MOUSE (APODEMUS URALENSIS PALLAS, 1811) (RODENTIA, MURIDAE) AT URBANIZED SITES OF THE SOUTHERN TAIGA SUBZONE

The dynamics of abundance and demographic structure of the small wood mouse (Apodemus uralensis Pallas, 1811) at urbanized areas of a pine forest located within the urban limits and exposed to anthropogenic impact of various degree and character was under study during 9 years. No clear relation between the abundance dynamics and the sex ratio dynamics (age ignored) in the populations of A.

DYNAMICS OF THE ABUNDANCE AND COMMUNITY STRUCTURE OF SMALL MAMMALS IN THE SARATOV TRANS-VOLGA REGION

The population of small mammals in different areas of the Saratov Trans-Volga region features long-term and constantly increasing numbers of Sylvaemus uralensis, and its wide distribution in a variety of habitats. The maximum density of S. uralensis is 72.0 ind. per 100 trap-days and the fraction in catches is 73.0%. A tendency is observed to an increasing numbers of Microtus arvalis.

RESTORATION OF A BLACK-HEADED GULL (LARUS RIDIBUNDUS) (CHARADRIIFORMES, AVES) COLONY: THE ROLE OF RELEASERS IN THE FORMATION OF A NEW BIRD COLONY

Our study was conducted on the Kiyovo Lake situated within the limits of the town Lobnya (Moscow region). Formerly, the lake had held a large colony of the Black-headed Gull. Since 1996, these gulls ceased to breed at this lake. During 2009 - 2015, we managed to restore the colony by the usage of artificial measures.

INFLUENCE OF THE AGROCHEMICAL TREATMENT OF OIL-CONTAMINATED SOIL ON THE ABUNDANCE DYNAMICS OF MESOPHILIC AND PSYCHROPHILIC MICROORGANISMS

The influence of a polymeric structure-formation agent, chalk and microorganisms on the numbers of mesophilic and psychrophilic microorganisms in oil-contaminated soil was estimated. A carbamide-formaldehyde structure-formation agent had the most positive effect on microbial growth. Introducing hydrocarbon-degrading bacteria and chalk influenced to a lesser degree.

DEVELOPMENT OF THE SYSTEMATIC APPROACH TO STUDYING AGRICULTURAL LAND AND AGROLANDSCAPE MANAGEMENT

Methodological foundations of agrolandscape-environmental studies and management of agricultural land were developed. They are based on the concept of conservation and reproduction of land and other natural resources used in agriculture, soil fertility, the productive longevity of agro-ecosystems and agro-landscapes (All-Russian Williams Fodder Research Institute); the concept of the ecological frame of agricultural landscapes and ecologo-economic balance (Moscow State University, Institute of Geography Russian Academy of Sciences).

INFLUENCE OF NATURAL AND CLIMATIC FACTORS ON THE NUMBERS OF SAIGAS (SAIGA TATARICA PALL.) (BOVIDAE, ARTIODACTYLA) BETWEEN THE VOLGA AND URAL RIVERS

Characteristics of the Uralian saiga habitats are discussed. Periods of high and low abundance of the animals that alternate depending on the productivity of plant communities and territorial humidity (the number of watering-places) due to climate changes are shown. After the occurring periodic mass death of saigas, their population is quickly restored to its previous level, according to the existing feed and water resources.

PHYSIOLOGICAL AND BIOCHEMICAL ASPECTS OF HALOPHYTE ECOLOGY

Physiological and biochemical features of euhalophytes, сrinohalophytes and glycohalophytes growing in natural conditions in the Elton Lake area were studied. The water content in tissues, lipid peroxidation intensity, and membrane permeability were found to determine the differentiation of plants by their salt accumulation strategy. The concentration of pigments and their ratio are related to the mesostructure of leaves and dependent on the salt accumulation strategy and living form. The membrane complex is connected with the cell structure and photosynthetic apparatus.

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

The paper examines the influence of the location of settlements, railroads and highways on the spatial structure of the Otis tarda population in the Trans-Volga region studied on a model area of 12,000 km2, located in the southern part of the Saratov Trans-Volga region in 1998 – 2016.

SOIL STATUS ASSESSMENT IN URBAN AREAS BY CHEMICAL AND ENVIRONMENTAL TOXICOLOGICAL METHODS

The ecological status of soils in an urbosystem was assessed in terms of the total content of heavy metals, their mobile forms, petroleum products, integrated toxicity, and soil catalase activity. Parts of the functional transport areas of the city have turned out to be the most disadvantaged areas. A tendency of suppression of the ciliate motor activity and the growth indicators of watercress, reduction of the catalase activity in urban soils are observed.

INFLUENCE OF MACROPHYTE DEVELOPMENT IN THE ZOOPLANKTON STRUCTURE FORMATION IN THE LOWER REACHES OF THE VOLGA RIVER DELTA

The cattail, reed and bur-reed association is the cenosis-forming ones for a part of the mouth of the Kutum duct of the kultuk area of the Volga river delta. The insular area of the avandelta is characterized by reed–mace associations. The terrestrial and aquatic vegetation begins to grow massively in late May. The aquatic vegetation begins to die since the end of July whereas the terrestrial vegetation, on the contrary, reaches its maximum in this period.

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