Ecology

The Edge Effect of Casebearer Species (Lepidoptera, Coleophoridae) in the Forest-steppe Ecotones of Lower Volga Region

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.

Ecological Problems of the Saratov Region in Year Environment and the Year of Specially Protected of Natural Territories

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 (electromagnetic, noise)

Saratov Scientific School by the Problems of Biology and Genetics of Plant Reproduction Systems: Achievements and Perspectives

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.

Aspects’ Change of Vegetation in Khvalynsky National Park and its Preservation Zone

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. In total 17 types of plants on blossoming rhythms are revealed.

Faunogenetic Structure of Birds Population and its Transformation in Connection with Depressive Changes of a Hydrological Annual Cycle in the Middle Reach of the Medveditsa River

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.

New Data on the Caddisfly Fauna of Mordovia (Insecta: Trichoptera)

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 Structure of Morphological Variability and Vitaliti in the Populations of Tulipa Gesneriana L. in the Lower Volga Region and Adjacent Territories

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.

Invasive Species of Plants in the Syzranka River Basin

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. The most active and widely distributed in the river basin Acer negundo, Bidens frondosa, Echinocystis lobata, Elaeagnus angustifolia and Elodea canadensis, changing the face of ecosystems. 

Habitat Types of American Mink (Neovison Vison Schreber, 1777) on for Example of Northern Lower Volga

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.

Age Structure of Coppice Tree Stands of Upland Oak Forests of the Southern Rart of Privolzhskaya Vozvyshennost’

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.

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