Экология

A microbiological study of soil with pesticides burial places in the Saratov region and identified the dominant microbial populations. The number of microorganisms analysis determined that the dominant group in the soil were heterotrophic bacteria and most sensitive – microscopic fungi. Obtained destructors effective microorganisms that break down pesticides prometrin, hexachlorocyclohexane and dihlordifeniltrihlormetilmetan (4,4-DDT). Strains of Pseudomonas putida P2, P. putida P6, P.

The article shows the dynamic of ecological conditions during development of watershed mires of karst origin. The genesis of mires depends on state of surrounding landscapes, types of bedrocks and hydrology. All these features lead to differences in accumulation of chemical elements in peat deposits. For each element the natural background was defined. The exceedances of natural background indicate anthropogenic impact. By this way, ecological situation of the region was defined.

The composition of plant communities in the northern part of the beams Ergeninskoy hill, growing conditions which caused sharply arid Republic of Kalmykia. Species dominating seasons of the year, their productivity and the value of livestock. The analysis of vegetation and the three beams Maloderbetovsky Sarpinsky administrative districts.

During four field seasons (2013–2016.) conducted a study of the structure of morphological variability and vitality. 38 populations of Tulipa gesneriana in several areas of the Lower Volga region and adjacent territories. The significant variability in the vitality structure of the populations as on the interpopulation level, and year. It is revealed that years of observation in General, most populations of the species were quite pronounced tendency for a gradual reduction of vitality. from 2013 to 2015 and significantly improve the plants in them in 2016.

The abundance dynamics of Falco vespertinus is considered on the basis of our field surveys carried out within the Saratov region and adjacent territories in 2011–2016 and analysis of the literature data. It is shown that F. vespertinus is now presented by stable populations in the spacious territory of the Trans-Volga part of the region. However, some reduction of its abundance was registered here for the last several decades of the 20th century. Currently, the falcon populations in the Volga right-bank region can be characterized as mosaic, and the F.

The article discusses the dynamics of the age structure of coppice tree stands of upland oak-groves of the southern part of Privolzhskaya Vozvyshennost’. Data is provided about fifteen sample plots which were laid in three forest areas of the Saratov region in the most common types of forest conditions (C1 , C1-2 and D1 ). Age was determined for all trees on the sample plot by the cores taken by age borer at the root collar.

Objective of the study – to identify biotopical American mink in the north of the Lower Volga region and conduct its ranking analyzed the predator population density in model habitats. We used the methods of accounting the route trail mapping and detection of sites with use GPS-navigator. Calculation animals identified on individual sites using camera traps, as well as classical methods of estimation of population density of predatory mammals. Statistical analysis was performed using cluster analysis.

The article presents results of a study of invasive plants on the territory of the Syzranka river basin: found 40 species of invasive plants, widespread and naturalized in varying degrees. Among them 5 species-«transformers», 5 alien species, naturalization semi-natural mastered the community, 18 kinds of dispersing and naturalized by disturbed habitats and 13 potentially invasive species.

Collecting efforts on the rivers Sura and Moksha in the autono- mous Republic of Mordovia (Russia) have resulted in the detec- tion of 14 species of caddisflies, which are recorded from the Republic for the first time. To date, a total of 39 species are listed for the Republic, which is only a small fragment of the residential fauna. It is expected, that more than 200 species of caddisflies occur in the region.

The flood plain of the Medveditsa River in the middle current is characterised by various fauna of birds. Nowadays significant transformations of local fauna, influenced by climatic conditions and anthropogenous loadings, are observed. In the valley of the river the most significant factor influencing communities of birds is the flood mode. The purpose of the work is the birds faunogenetic structure analysis of the Mededitsa river flood plain, and also it`s dynamics under the conditions of degradation of an inundated hydrological cycle.