A comprehensive population analysis on the environmental gradient proved to be a powerful tool for determining the key components of the adaptive strategy of I. parviflora, as well as for identifying ecological factors, which are in due for the performance of the species’ populations in the secondary range. A gradient of deterioration of living conditions from close to natural Fraxinus excelsior L., Quercus robur L., Carpinus betulus L. forests to Pinus sylvestris L. forestry plantations has been observed for the studied species. At the same time, a negative impact of population density on vitality and morphological integrity of individuals has been revealed. Among the 20 populations, more than a half was rated as having the flourishing vitality type. This indicates on high ecological plasticity of the species, which have eventually led to a high level of naturalization in the introduced range. Indicative for I. parviflora is the shift between stress and protective components of the ontogenetic strategy. As a consequence of this ability, individuals possess a high level of morphological integrity, allowing populations to exist in stressful conditions.

Keywords: alien species, morphological integrity, population analysis, vitality analysis

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