ценопопуляции

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

Authors: Nevzorov A. V., Smirnova E. B., Sergeeva I. V., Ponomareva A. L., Shevchenko E. N.

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.

Morphological Variability and Biochemical Indices of Leaves in Coenopopulations of Aegopodium podagraria L. (Apiаceae, Apiales) under Various Levels of Soil Pollution with Heavy Metals

Authors: Savinov A. B., Erofeeva E. A., Nikitin Y. D.

The morphological variability, lipid peroxidation rate (LPR) and photosynthetic pigment content in the leaves of Aegopodium podagraria L. were studied in four coenopopulations growing in urban ecosystems whose soils were contaminated, to varying degrees, with heavy metals (HM): Pb, Zn, Cu, Cr. The increase of the HM level in the soil induced a decrease in the terminal leaflet size, the average number of phens (i.e. various variants of the leaf shape), and the chlorophyll content b in leaves but the percentage of rare phens increased.

SOME ECOLOGICAL PECULIARITIES OF BULBOCODIUM VERSICOLOR (KER-GAWL.) SPRENG. (COLCHICACEAE, MAGNOLIOPHYTA) IN THE LOWER VOLGA REGION

Authors: Kulikova L. V., Kashin A. S., Petrova N. A., Shilova I. V.

The paper presents the results of our four-year observation of Bulbocodium versicolor (Ker-Gawl.) Spreng populations in the Saratov and Volgograd regions. A low ecological plasticity of the species was established. Although the species grows in steppe phytocenoses that vary in composition and structure, the specimens’ morphology was rather conservative, which can be explained by the homogeneity of the species’ vegetation conditions over the territory under study during active vegetation and flowering. It is shown that in the Lower Volga region, B.

REPRODUCTIVE BIOLOGY OF CYPRIPEDIUM GUTTATUM SW. (ORCHIDACEAE, MONOCOTYLEDONES) AT THE NORTHERN BORDER OF ITS HABITAT

Authors: Kirillova I. A., Pestov S. V., Kirillov D. V.

The paper presents data on the reproductive biology of Cypripedium guttatum Sw. (Orchidaceae) in the Komi Republic, at the northern border of its habitat. Bees (Lasioglossum calceatum and L. brevicorne) are pollinators of C. guttatum in the region. The pollination efficiency is 21%. C. guttatum seeds are the largest ones among those of other orchid species in the region (1.11×0.22 mm). The size of seeds depends on the growing conditions of mother plants. The seed productivity of C.