Scientific publications

For the first time, data on the fauna of soil nematodes and the structure of their communities under the invasion of Sosnowsky's hogweed Heracleum sosnowskyi Manden. into northern meadow ecosystems have been obtained. The study was conducted in the Republic of Karelia in the locations where some of the most extensive densities of hogweed growth currently exist (Essoila village, Pryazhinsky district; Shuya village, Prionezhsky district). The study showed that the abundance and taxonomic diversity of soil nematodes in the hogweed habitats varied greatly. Bacterial feeders, omnivorous and plant-associated nematodes dominated in the community structure, meaning that eco-trophic groups of nematodes with a wide range of nutrition were highly abundant. Based on a comparative analysis of data obtained from two model sites - a monodominant plant community formed by hogweed and a meadow biocenose - the changes in main characteristics of nematode communities occurring upon hogweed introduction into meadow ecosystems were identified. It was found that under hogweed invasion, dominant nematode genera and the ratio of eco-trophic groups changed. However, the total number of identified nematode taxa remained almost the same. Thus, the introduction of a new alien plant species into natural communities does not lead to a significant decrease in the nematode fauna diversity. Regression analysis revealed statistically significant patterns between a number of parameters characterizing soil nematode communities (total nematode number, Margalef's richness index, relative abundances of some eco-trophic groups) and the following environmental factors - soil acidity, total carbon and nitrogen content. Thus, the conducted investigations also allowed assessment of the role of soil conditions as factors in the formation of soil nematode communities under H. sosnowskyi invasion into meadow ecosystems.