Negative effects in mountain ecosystems are caused by uncontrolled collection of plant species and illegal hunting of large carnivores and the Balkan chamois. Threats are also induced by overuse of biological resources, mostly for commercial purposes. Thus, a high number of indigenous medicinal and aromatic plants, 67 species of mushrooms, more than 110 species of diatom algae, 12 species of lichens, 12 species of ferns, and 20 species of mosses are all at risk. At the national level, the most threatened groups of higher plants are the angiosperms (flowering plants) (with approximately 280-300 species). Aquatic and wetland plants are especially endangered.