Results of investigations of morphometric variation, parameters of seeds production, features of vitality, and correlation structure of three model coenotic populations of Fritillaria ruthenica Wikstr., a rare species on the territory of NNP Pyryatynsky, are presented. It has been found that the species prefers communities of the classes Trifolio-Geranietea, Querco-Fagetea, and Robinietea. The zonal structure of a monocarpic shoot is stable in various habitats. Nevertheless, the environment determines a significant level of morphometric variation demonstrated by the results of canonical discriminant analysis and dispersions of mean number for 26 parameters of the structure of F. ruthenica. The correlation structure indicates a high level of morphological integration of the specimens. The obtained data on seed production of this species agree with those for F. ruthenica on the northern limit of its range. According to the type of vitality structure, coenotic populations are differentiated into depressive (in Trifolio-Geranietea community) and equipoised (in Querco-Fagetea and Robinietea communities) ones. Ecological parameters of the habitat are highlighted as a main factor of this differentiation. Special attention is given to active and passive measures for conservation of F. ruthenica.

Keywords: coenotic population, Fritillaria ruthenica, vitality, variation, NNP Pyryatynsky

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