bibliography:

Dvirna,  T. 2019. Ergasiophytes of the alien fraction of the flora of Romensko-Poltavsky Geobotanical District (Ukraine): checklist and analysis. Geo&Bio, 18: 21–36. (In Ukrainian)

doi: https://doi.org/10.15407/gb1804

authors (with orcid and affiliation):

Tetiana Dvirna orcid https://orcid.org/0000-0002-9279-9766

M. Kholodny Institute of Botany, NAS of Ukraine (Kyiv, Ukraine)

pdf: pdf

summary:

The results of complex research on ergasiophytes in the alien fraction of the flora of Romensko-Poltavsky Geobotanical District are presented. The specified group of species in the region is represented by 117 species of vascular plants of 98 genera and 41 families, thus comprising 34 % of the total number of species of the alien faction in general indicating a low taxonomic richness. The results of complex analysis of ergasiophytes showed that by the primary habitat, most of ergasiophytes are of North American (37) and Mediterranean (20) origin; cosmopolitan (23 species) and Holarctic (21) types of ranges are the dominant in the geographic structure; species of arid regions (72 species) are the dominant by the relation of primary habitats to bioclimatic regions; polyregional species (54) dominated among different range groups; diffuse (45), diffuse-local (20) and local (13), species dominated by the nature of spatial structure; heliophytes (73 species), mesotrophs (70), mesophytes (41), and xeremosophytes (40) dominate, as it was found in the result of analysis of the ecological structure; kenophytes (108) dominate by the time of introduction, and ergaziophigophytics (78) dominate by the degree of naturalization. Distribution maps of some species are presented. It was established that among the ergasiophytes are invasive species, such as Acer negundo, Ambrosia artemisiifolia, Iva xantifolia, and Solidago canadensis, as well as potentially invasive, such asAsclepias syriaca and Parthenocissus quinquefolia. As a result of the analysis of the impact of invasive and potentially invasive plant species on phytodiversity in the region, we found that all of them are characterised by high I-Rank (78–100). By the degree of naturalisation, they belong to agriophytes and agriopepophytes. The main introduction centres of the studied group of plant species (places of primary cultivation, agricultural lands, and large transport ways) are defined. The obtained data supplement and confirm general laws concerning ergasiophytes in the territory of Ukraine.

Key words:

ergasiophytes, alien fraction of flora, Romensko-Poltavsky Geobotanical District, Ukraine.

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