Vestnik of Orenburg State Pedagogical University. Electronic Scientific Journal. 2020. № 3(35). P. 96—104
03.00.00 BIOLOGICAL SCIENCES
UDC 581.55
Chadaeva Victoria Alexandrovna, Doctor of Biological Sciences
Tembotov Institute of Ecology of Mountain Territories of the Russian Academy of Science Kyarova Galina Anatolievna, Science Researcher
Tembotov Institute of Ecology of Mountain Territories of the Russian Academy of Science
POPULATION STATUS AND VARIATION OF THE RARE SPECIES Neotinea tridentata (Orchidaceae) UNDER ANTHROPOGENIC LOAD CONDITIONS IN THE MEADOW PHYTOCENOSES OF THE CENTRAL CAUCASUS
Abstract
The authors studied variation of morphological characters, ontogenetic structure and vitality of nine cenopopulations of Neotinea tridentata within the Kabardino-Balkar Republic in 2015—2019. The studies were conducted in the meadow plant communities under different conditions of anthropogenic load (grazing). The species presents medium phytocenotic plasticity of morphological characters (Ip = 20—57%) and high variation of morphological characters (average value of CVх¯ср is 22,90%) under changeable conditions of growth. The intensification of growth processes in the individuals with the maximum increase of the cenopopulation vitality (IVC = 1,06—1,16) is observed in the composition of undisturbed meadows. The portion of generative individuals is 64—74,9% in ontogenetic spectra, the weak seed reproduction and the low density of cenopopulations (0,03—0,11 ind./m2) are registered. Under the intensification of the anthropogenic load, vitality of cenopopulations (IVC = 0,83—0,96) is decreased; the portion of virginal individuals in ontogenetic spectra (28,7—34,4%) and the density of individuals (0,18—0,76 ind./m2) are increased. The rate of the seed reproduction of cenopopulations, in which the density of individuals accounts for 4—5 ind./m2, is high in the forest edge with low total projective cover.
Key words
Neotinea tridentata, cenopopulation, variation of characters, vitality, ontogenetic structure, life strategy.
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Bibliography link to this article:
Chadaeva V. A., Kyarova G. A. Population status and variation of the rare species Neotinea tridentata (Orchidaceae) under anthropogenic load conditions in the meadow phytocenoses of the Central Caucasus. Vestnik of Orenburg State Pedagogical University. Electronic Scientific Journal, 2020, no. 3 (35), pp. 96—104. DOI: https://doi.org/10.32516/2303-9922.2020.35.7.