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  Dmytrash-Vatseba I.I. Modelling of rare plant species diversity changes by anthropogenic factors in meadow steppes of the Southern Opillya // Proc. of the State Nat. Hist. Mus. - Lviv, 2017. - 33. - P. 133-142. DOI: https://doi.org/10.36885/nzdpm.2017.33.133-142 Key words: Rare plant species populations, regression, model, meadow steppes degradation, the Southern Opillya Nowadays, area decrease and pastoral digression enhance are determinative factors for the extinction of rare plants populations. Making their cumulative impact on rare fraction of meadow steppes, these negative factors govern 74.4 % of habitats richness in the Southern Opillya. Two models were built to demonstrate the process of rare species number reduction under stress of the negative factors. Model I (regression model) displays a graduate ten times reduction in rare plant diversity rate with increasing of the factors intensity. Model II was developed based on generalized dataset of rare species number in habitats. It reveals an abrupt reduction of rare plant richness at the very beginning of habitat degradation, also at the last stages of this process. A species composition of rare fraction of flora for meadow steppes at different degradation level is presented.  
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