The species composition of the investigated springs depends on such factors as geographic location, type of spring, and the characteristics of the surrounding ground vegetation. In Byelorussian springs the co-occurrence of species was analysed. On the level of co-occurrence of 50% and over a group of 10 species which can be considered as the most characteristic of Byelorussian springs was distinguished.
Between 12 and 23 July 2006, dragonflies of selected localities in the Vasyugan Plain, West Siberia, were studied by Rafał Bernard and Oleg Kosterin. The article presents personal impressions of the first author from this expedition, partly based on the odonatological results. Our investiga- tions were focused on the largest in the world complex of Sphagnum bogs and fens, and on rivers flowing between them. Additionally, smali anthropogenic water bodies were also visited. In total, 34 odonate species were recorded. An important result of our expedition is the picture of the summer aspect of the odonate fauna in these mostly primeval and remote boggy areas, with the flourish- ing complex of peat-moss bog species and an interesting species composition in rivers. Nehalennia speciosa (the main aim of our expedition) and Aeshna subarctica, both species poorly known and considered to be rare in Siberia, appeared to be omnipresent