Study on the distribution of climbing plants (climbers) on the territory of the Danube island Aydemir, Bulgaria.
The purpose of the present study is to describe the diversity, distribution and participation of the climbing plants (woody and herbaceous climbers) in the different plant communities in natural habitats of the Danube island Aydemir which is part of NATURA 2000 and to investigate their participation in the succesional processes. The methodology includes setting up Permanent Sample Plots (PSP) in different parts of the island with natural and semi-natural vegetation. The composition, cover abundance and occurrence of all the plant species in the PSP and their affiliation to a specific habitat type of NATURA 2000 were determined, as well as some soil properties as a major part of natural conditions giving specificity of plant composition. During the study, 36 species of vascular plants were identified belonging to 33 genera and 26 families from Magnoliophyta division - 41,4% of all the species and 66,7% of the vines are diagnostic for habitat 91EO Alluvial forests with Alnus glutinosa and Fraxinus excelsior (Alno-Padion, Alnion incanae, Salicion albae). The study shows that the distribution and diversity of climbers on the territory of Aydemir island, are mainly determined by vertical structure and age of forest communities and the high species richness in them. Among the climbers found on the island, the invasive alien species Sicyos angulatus has the strongest influence on the condition of natural habitats, and represents a real threat to their diversity.