Home – Home – Jornals – Contemporary Problems of Ecology 2007 number 4

As a result of investigation of the activity of antioxidant enzymes: peroxidase, catalase and glutathione-S-transferase, their localization and possible size-age dependence in Baikal amphi

As a result of search of the species and strains of entomopathogenic fungi and bacteria virulent to migratory locust (Locusta migratoria migratoria L.), the combinations causing high mortality of insect in a short time interval were found. After the L. migratoria was infected with Beauveria bassiana (Bals.) Vuill and Metarhizium anisopliae (Metsch.) Sorokin, we observed 4

The indices of biodiversity and structure of the complexes of Carabidae of spruce-fir and aspen-birch forest in the gradient of chemical pollution with the emissions from the Sredneural

Retrospective review and modern state of dyn

Distribution of the fish rotan Perccottus glenii Dybowski, 1877 in the North-West Eurasia is characterized by the development of several centres of distribution. Since 1990, populations of rotan are known in the ponds in the vicinity of Tomsk town, which is located considerably far from the nearest sub-ranges of this alien fish (Transural region and the basin of Lake Baikal). In 2005 we performed a special inspection of floodplain waterbodies (N = 81) in Tomsk and Tumen

Biotope confinement and abundance of reptiles were determined on the basis of the data collected during 12 years in the forest, forest-steppe and steppe zones of the Ob region (West Siberia), a connection between non-uniformity of reptile communities with the main structure-forming environmental factors was estimated, and a map of the communities of this animal class was composed.

The main elements of the theory of organization of the communities of many species are considered in the work.

Features of bird distribution over the forest-field ecotones of southern taiga and northern forest-steppe of the Urals are considered. An increase in species diversity and in the number of birds in the field belts near the forest borders is demonstrated, along with avoidance of forest vicinity by the species living in an open space. Ecological and behavioral aspects of these phenomena are considered. A quantitative estimation of the manifestation of the forest border effect and its role in the formation of the spatial structure of bird population of an agricultural landscape is presented.

For Lower Amur region as example, the features of bird distribution over various habitats from undisturbed to urban ones are described on the basis of the results of long-term investigations. The trends of territorial changes in overall characteristics of bird complexes are determined. The spatial-typological structure of bird complexes and the main structure-forming environmental factors are revealed, their role in the organization of bird communities in the Lower Amur Region is estimated.

The main bird communities of the Norsk reserve are considered. The highest density of bird population (150

A reliable decrease in the number of synanthropic and bush-forest birds, an increase in the number of polyphages and air-soaring birds were demonstrated on the basis of accounting of birds in Novosibirsk in the years 1978

Season

Distribution of millerbirds over the territory of the upper Don is limited to a small number of near-water biotopes. In this connection, a special rope is played by anthropogenically transformed territories. Works performed in 1999

To evaluate inter- and intrapopulational divergence of the Siberian White crane (Grus leucogeranus Pallas), a phylogenetic analysis of mitochondrial DNA D-loop fragment (512

Demographic characteristics (age structure, increase in population, female prolificacy) of sables in the Trans-Ural region are investigated on the basis of the data collected during the years 1951-1968 and 1978-1990. The revealed statistically valid differences in the parameters allow concluding that a substantial intensification in the reproduction process in sables occurred in the region in the end of the XX century, and the cyclic character of number dyn

Measurements of the length of otoliths extracted directly from salmon-like fish (SF), which are a component of the diet of Baikal seal (Pusa sibirica Gm.), and from the alimentary tract of the animals were carried out. It was calculated on the basis of the analysis of the content (otoliths) of the alimentary tract of seal and the obtained regression equations that the modern population of seal annually consumes ~ 9,3 mln of SF individuals mainly of the medium size for the species. The biomass of consumed fish is estimated to be 1772 t/year (lim 1393

The structure of 756 summer and 169 winter nest burrows belonging to different age groups of male and female Daurian souslik individuals was investigated at the northern outlying regions of the natural habitat during seasonal and all-year-round stationary investigations in 1980

Comparison of the data characterizing the population structure of mole voles in the central part of the natural habitat (The Ural Region) and at its north-eastern periphery (Novosibirsk Region) shows that habitation under ecologically pessimal conditions does not affect the density of populations and number of members in separate families, but causes a decrease in the lifetime of individuals and, as a consequence, an increase in the reproductive output at the level of a population due to an increase in the number of reproducible females. The features of changes in the occurrence of differently colored phenotypes in the geographic gradient revealed at the north-eastern periphery of the species habitat are similar to those in the central part of the habitat

Data obtained on the reproductive features, life duration, specificity of morphogenesis and genetic structure, trophic links, some physiological indices, bioaccumulation of moor frog inhabiting the territory of East Ural radioactive trace are generalized. It is shown that the stability of R.arvalis population existing for a long time under the conditions of radionuclide contamination is sustained due to the selective survival probability of the individuals with high stability of morphpgenesis and inherent physiological features.