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Floristic Diversity of Watercourses and Temporary Reservoirs of the Ostrovtsovsky Cluster of the Volga Regional Forest-Steppe State Natural Biospheric Reserve Impacted by the European Beaver’s Expansion

The paper is devoted to an important problem of modern ecology, namely, the reaction of native ecosystems to the activity of invader species, with the European beaver (Castor fiber L) as an example. This species transforms the environment as a result of its foraging and constructive activities. Higher vascular plants (macrophytes) in water bodies and streams are one of the basic components of biotopes. They serve as a limiting factor for the spread of such invasive species as C. fiber, because macrophytes determine the basis of this animal’s diet.

Ontogenetic Structure of Coenopopulations of Orchis militaris L. and Dactylorhiza incarnata (L.) Soo (Orchidaceae, Liliopsida) in Romanovsky District, Saratov Region

The results of studies conducted in Romanovsky district of the Saratov region during the period of mass flowering of Orchis militaris L. and Dactylorhiza incarnate (L.) Soo from June 2 till 16, 2017, are presented. Descriptions of habitats of the species (a hollow and a pasture), which differ in the projective cover and dominants, are given.