Participation of some rare and relict plant species in palynofloras of the Allerød–Holocene deposits of the Forest-Steppe zone of Ukraine

Results of our analysis of species components of palynofloras of the Allerød–Holocene deposits of nine sections located in the territory of the modern Forest-Steppe zone of Ukraine are summarized. It is demonstrated that rare and relict species (Betula humilis, Dryas octopetala, Pinus cembra, Linnaea borealis, Thalictrum foetidum, Pinguicula vulgaris, Scheuchzeria palustris, Utricularia intermedia, and Utricularia minor; all listed in the Red Data Book of Ukraine, 2009) participated in the formation of the species composition of these fossil palynofloras. For the first time, the spatiotemporal differentiation of the distribution of these species on both the Right Bank and the Left Bank of the Forest-Steppe zone during the Allerød– Holocene was established based on the generalized data of paleofloristic studies. Results of palynological studies indicate that the Left Bank of the studied territory, compared to the Right Bank, has a higher degree of paleofloristic study. For each of the rare and relict species, the upper limit of participation in the composition of the vegetation cover of the Forest-Steppe zone during the main Allerød–Holocene stages was substantiated, and the general tendency of the regressive character of the modern areas of their distribution was confirmed. The obtained data indicate the perspective of using paleofloristic materials for further detailing of paleobotanical reconstructions, as well as for paleophytochorological, chorological research, analyses of relicts and their refugia.