Considerations concerning the distribution and impact of the most infamous invasive plant species from Bistrita River Basin (Neamt and Suceava Counties, Romania)

Is well known that the uncontrolled spread of invasive alien plant species is among the most urgent nature conservation issues of this century. Our aim is to study and publish a few notes linked to some observations regarding the presence, distribution and the negative impact of some invasive plant species from Bistrita river Basin. There are more than 80 adventive species of plants that are spreading in the middle basin of Bistrita River. In this paper we present new data regarding the distribution and impact of the most problematic invasive plant species. These species cause losses, economically and from the biodiversity point of view. According to our observations, in the present time, the most aggressive alien plant species, worth to be mentioned are: Acer negundo, Ailanthus altissima, Amorpha fruticosa, Ambrosia artemisiifolia, Elodea canadensis, Impatiens glandulifera, Reynoutria japonica (= Fallopia japonica), Robinia pseudoacacia and Xanthium strumarium. There are also some other species that have a more local impact. We will also mention and discussed the spread of these alien plant species