Impact of alien invasive plants on the ecological status of watercourses in Austrian Natura 2000 protected areas

Riparian zones are characterised by an extraordinary diversity of plant species and environmental processes. Despite their outstanding importance, riparian zones are among the most threatened ecosystems. In Austria, invasive neophytes particularly invade riparian habitats (softwood riparian forests, tall herbaceous vegetation, riparian pioneer vegetation). The invasion of alien species is causing the loss of natural riparian habitats and can have a severe impact on biodiversity. However, due to a lack of data, only limited statements can be made about endangered regions and watercourse types. Natura 2000 areas are one of the most important categories of protected areas in Austria in terms of their size. Control in protected areas such as European protected areas is a priority because they were established as refuges and habitats for endangered animal and plant species.