Home – Home – Jornals – Contemporary Problems of Ecology 2019 number 1

The features of the long-term fluctuational dynamics of the populations of tuberoid orchids ( Neottianthe cucullata and Dactylorhiza incarnаta ) growing in various phytocoenotic and climatic conditions are presented as the realization of the mechanism of population stability under conditions of a heterogeneous habitat. The work shows ability of populations to take advantage of microsites favorable for their existence, the conditions in which are determined by the temporal dynamics of climatic factors, the abiotic environment and interspecific interactions. It is established that the unidirectional dynamics of the populations of tuberoid orchids, determined by demutative-digressive successions in plant communities under the combined effect of abiotic, biotic and anthropogenic impacts, leads not only to a decrease in abundance and density, but also to the destruction of the spatial distribution and the population life stage structure. The relationship between species abundance and climatic factors is assessed using a correlation coefficient which is significant for adult reproductive plants of forest species ( N . cucullata ) and for juvenile plants of meadow species ( D . incarnаta ).