Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Invasion of Ambrosia artemisiifolia L. in the lower course of the siret river.

Abstract

Ambrosia artemisiifolia is one of the invasive neophytes in Romania, of North American origin, which has attracted the increased interest of researchers worldwide especially because of its allergenic pollen. Since 2001 (the year of first reporting) up to now, it has widely spread in the lower course of the Siret river (an area which overlaps with the perimeters of two sites of Community interest, namely ROSCI0162 and ROSPA0071). Based on our own research conducted between September 2018 and October 2020 and the data from the literature confirmed by us in the field, A. artemisiifolia is currently known from 49 localities in the study area, representing 96% of the total work points. According to our data, in the lower course of the Siret river, this species has invaded 14 types of EUNIS habitats (6 anthropogenic and 8 natural) being registered (as accidental up to dominant) in the phytocoenoses of a number of 14 plant associations. The anthropogenic habitats with the highest level of invasion of A. artemisiifolia (expressed by values of abundance-dominance in the structure of phytocoenoses) are the following ones: Anthropogenic herb stands, Transport networks, Extractive industrial sites and Arable land and market gardens. In most types of natural habitats in which we had identified it, A. artemisiifolia occurs only as an accidental species in the structure of plant communities. However, the zoo-anthropogenic disturbances can also cause high values of abundance-dominance of this species in some natural habitats such as E3.4b - Moist or wet mesotrophic to eutrophic pasture (which is endangered at European level).