Spatio-temporal Distribution of Entomophages in Phytocenoses of Anthropogenically Modified Landscape in the Forest-steppe of Western Siberia

Abstract

The research was aimed at identifying the characteristics of spatiotemporal distribution of entomophages in the herb and the aboveground layers in phytocenoses of agricultural landscape of the Northern forest-steppe of Western Siberia. Based on the analysis of the structure of entomocomplexes of phytocenoses with various types of flowering and frequency of anthropogenic successions (herbs dominated by Galéga orientalis, and adjacent phytocenoses of Vicia faba and Brassica napus), the similarity of the taxonomic composition of major entomophages and changes in the ratios in favor of phytophages in phytocenoses of cultivated crops has been shown. The close dependence of the number of insects on the hydrothermal conditions of vegetation conditions has been revealed. Biodiversity of entomocomplex in herbs has been veraciously higher, as compared to Vicia faba and Brassica napus, the total number of insects was maximum in the phytocenosis of fava beans due to the manifold increased domination of phytophages. The importance of preserving the sites with flowering plants as donors of natural entomophages has been proven. Their wide food chains ensure stabilization in the number of pests on annual crops that belong to different botanic families. The entomophagous complex underwent significant changes during migrations, carabids featured higher relative abundance in the agroecosystems of Vicia faba and Brassica napus, the level of dominance of entomophages in the herbs level remained at the level of phytocenosis of Galéga orientalis, ensuring natural regulation of phytophages population.

Biological Peculiarities of Archips rosana, the Insect Pest of the Sievers Apple Tree (Malus sieversii) in the Trans-Ili Alatau Ridge (the North Tien Shan)

“…Leafrollers were given their name because the larvae of most of their species live in folded leaves, damaging and often skeletonising them. They pose a serious danger in entomocenoses of not only cultivated gardens and natural populations of fruit forests, but also in fruit and berry nurseries (Matesova, 1960;Zhigaltseva, 1963;Charmillot, 1992;Toropova et al, 2016;Knyazev and Dubatolov, 2019). Of particular danger to apple trees are larvae of the Archips rosana, which during the growing season causes an irreparable harm by damaging flower buds, lush leaves and fruits.…”

Численность популяции жука-оленя lucanus cervus (l.) Лесного массива в Воронежской области, рассчитанная по пищевым остаткам сорокопута-жулана lanius collurio (l.)

“…Естественная растительность играет важнейшую экосистемную, экологическую, биологическую, а также биоресурсную роль как резервата диких сородичей культурных, пищевых и лекарственных растений [Khadeeva et al, 2011;Zohary et al, 2012;Dzyubenko, 2013;Kulikov et al, 2013;Toropova et al, 2016].…”