Invasive alien plants and vegetation dynamics

Plant communities which are subject to different ecological processes such as primary and secondary succession, regression, degeneration and regeneration, as well as fluctuation, are vulnerable to varying degrees to the penetration of alien species and their entry into the neophyte phase. Degeneration followed by regeneration of the natural community occurs, creates particularly favourable conditions for the establishment and permanent maintenance of alien species in plant communities, which stabilise over time. Secondary succession may be similar significant in plant communities on the ruins of settlements, unused transportation routes and, rarely on abandoned fields. As a process determining the permanence of a given community and its links with the biotope and biochore, the fluctuation ongoing in natural, undamaged plant communities is a process which basically prevents the encroachment and establishment of alien species, in spite of the fact that there is - at the same time and in the same conditions - a constant renewal of populations of the primary component species proper to the community.