Natural and historical reasons, mechanisms of expansion as well as ecological and coenotic peculiarities of model alien aquatic macrophytes such as Azolla cristata, A. filiculoides, Elodea canadensis, E. nuttallii, Vallisneria spiralis, Egeria densa, Pistia stratiotes, Phragmites altissimus and Zizania latifolia in Ukraine’s reservoirs are discussed. It is established that at present Pistia stratiotes and Egeria densa are the most dangerous for hydrotopes. The mentioned species have wide ecological ranges and high invasive potential. The increasing human impact on reservoirs combined with climate condition changes will promote their expansion in the reservoirs of Ukraine and disturbance of hydroregime and, consequently, degradation of native vegetation. Nature component influence of phytoinvasive species at the specific, coenotic and ecosystem levels has been revealed. Within the European strategy and necessity of warning and control of invasive alien species (European Strategy on Invasive Alien Species, 2004), a special integral program on threat assessment of phytoinvasive species impact on phytodiversity of Ukraine’s reservoirs has been drafted. The preventive measures of counteraction and priority directions for its pursuance have been also suggested. As for abidance of ecological safety rules under growing of higher aquatic plants in aquarium and pool culture, caution must be taken.

Keywords: phytoinvasive species, potential, aquatic macrophytes, threat assessment, Ukraine

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