Экология

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.

In article features of aspects’ change of National park’s Khvalynsky (Saratov region) vegetable communities are revealed by V. V. Alyokhin’s method of sequential descriptions. Five vegetable associations: 1) Stipeta pennatae –Bromopsisosa riparia – Pluriherbosa, 2) Stipeta capillatae – Festucosa valessiaca – Herbosa; 3) Stipeta pennatae – Festucosa valessiaca – Herbosa on sand; 4) Acer platanoides + Tilia cordata – Convallaria majalis; 5) Acer platanoides + Tilia cordata – Aegopodium podagraria are observed.

Saratov Scientific School by Biology and Genetics of Plant Reproduction Systems was formed under the leadership of Doctors of Biology S. S. Khokhlov and V. S. Tyrnov. Most of the unique research was performed in the Laboratory of Radiation and Experimental Genetics, established in 1958. Later it was transformed into the Department of genetics and reproductive biology of the Saratov State University Botanical Garden. Over the past 60 years, Saratov scientists have made a significant contribution to the development of fundamental and applied science.

The ecological problems of the Saratov region in the Year of Ecology and Protected Areas are discussed: the degradation and destruction of natural complexes, the reduction of species biological diversity and its causes, the need to expand the network of regional SPNA, reduce atmospheric pollution, hydrosphere and lithosphere (limiting emissions of harmful substances and reagents, non-waste technologies, introduction of alternative energy, modern technologies for waste processing and wastewater treatment), soil fertility conditions, growth new technogenic pollutants (ele

The casebearer`s fauna of the South-East of European Russia in its forest-steppe and steppe landscape zones on the territory of the Volga region in 1990–2016 was studied. The high species richness and the heterogeneity of the taxonomic structure of the casebearer moths on the border of forest and steppe cenoses on the border with the steppe were observed. It was established dwelling 172 species of casebearers of the 49 genera and their biotopical distribution in the studied landscapes.

Geoinformation models of species distribution are increasingly used in population ecology. The article describes the creation of a geoinformation model of the spatial distribution of the badger within the Saratov right bank. The research tasks included the selection of parameters according to the criteria for the suitability of European badger habitats. ArcGis is used to build the model. This method allowed to identify 211 potentially suitable habitats of the badger. The result of the study is a map of possible habitats of the European badger

As known, food supplies is one of the most important factors of populations dynamics, which depends itself on a condition of nutrition and might change within. Objective of research is comparison analysis of rations of E. przewalskii and C. bactrianus, which was semi-corral breeded on a land of a “Rostovsky” nature reserve.

In work data on content in Ilevna river`s water of the main anions and cations, heavy metals are submitted. The majority of the studied indicators within their maximum permissible levelshas been estab- lished. Excesses of these values were registered in four parameters. For phosphates excess of maximum permissible level is established in a source. For fluoride ion excess of the standard is revealed in the point of selection located above confluence of the Kartynriver. Up to gland maximum permissible values are exceeded in the Ilevna river estuary.