Экология

Based on quantitative counts of the abundance of four species of the genera Aelia and Neottiglossa (Heteroptera, Pentatomidae), the process of formation of their populations in the overgrown burnt areas of the Usman Forest (Voronezh region) after a fi re in 2010 was modeled. It has been established that mesoxerophilic species Ae. acuminata and N. leporina appeared in the formerly burnt areas 5–6 years after the fi re. The mesophilic species N. pusilla is a permanent inhabitant of ecotone biotopes and has not shown a tendency to colonize the formerly burnt areas.

In many parts of the world, urban green spaces are being explored as a source of ecosystem services. Their role in the provision of regulation of and, support of ecosystem services and even in the provision of cultural services is considered. At the same time, species assessment of the composition and vital condition of trees that provide ecosystem benefits in an urbanized environment is becoming increasingly relevant.

Six years have passed since, in 2018, an invasive species from Europe – the Ohrid miner Cameraria ohridella (Lepidoptera: Gracillariidae) penetrated into the Lower and Middle Volga region and began to actively populate urban landscapes planted with horse chestnut. Using the example of the regional center of Saratov, the temporary aspects of settlement and damage to horse chestnut trees over the specifi ed period are considered.

The article deals with the stages of recreational digression of diff erent biogeocenoses in the Shirokovsky district forestry of the National Park “Buzuluksky Bor” and the peculiarities of radial growth of the common pine as a dominant stand. The aim of the work was to analyze the comparative response of the common pine trees in the zone of active recreation and in undisturbed areas. The presence or absence of undergrowth, understorey, projective cover and dominance of indicator plants were noted.

The paper presents the results of studying the adventive component of the seed bank of the Oak Mane Island of the Volga River Valley in the vicinity of the city of Saratov. Seeds of 12 species of adventitious plants were registered in the seed bank of the studied forest communities. All identifi ed seeds belong to plant species belonging to one department of Magnoliophyta, 8 families and 12 genera. The Asteraceae family plays a leading role in the taxonomic spectrum of adventitious seed bank species (42%).

The distribution of cicadas in the Khabarovskii Krai has been studied very poorly, in contrast to the Amurskaya Oblast’ and Primorskii Krai. Ledra auditura (Ledridae) (also recorded from the eastern part of Zabaikal’skii Krai, the Argun River basin), Glossocratus foveolatus (Cicadellidae), Eoscartopsis assimilis (Cercopidae), Taihorina geisha (Machaerotidae), Cicadetta yezoensis (Cicadidae), Delphax maritima (Delphacidae), Mysidioides sapporensis, Losbanosia hibarensis, Zoraida albicans, Z.

The eff ects of natural factors (temperatures +34°C and +20°C) and anthropogenic xenobiotics (1,2,4-TriH; 1-(CH3 SO2 )-1H-1,2,4-Tri; 4-(PhSO2 )-4H-1,2,4-Tri; 4-(TolSO2 )-4H-1,2,4-Tri) on watercress Lepidium sativum L. was studied. For this, 4 series of experiments were carried out. In the fi rst two series, the eff ect of concentrations was studied: 0.001, 0.01, 0.1 mg/ml during germination at diff erent temperatures for three days.