Vegetation diversity of the two Dinaric karstic rivers in Bosnia and Herzegovina

Plant communities were studied along two oligotrophic karstic rivers–Trebižat and Listica–from 2007 to 2009. Based on 93 phytosociological releves, using Braun–Blanquet methods, a total of 25 plant associations were recognised in the rivers and nearby surveyed area. These associations have been subordinated to 11 alliances, eight orders and six classes: Adiantetea capilli–veneris, Lemnetea minoris, Potametea pectinati, Phragmito australis–Magnocaricetea elatae, Molinio–Arrhenatheretea and Salicetea purpureae. In the Trebižat and Listica rivers, 24 and 10 associations were found respectively. Only nine associations were common to both rivers. Data on the floristic composition of eight associations (Eucladio–Adiantetum capilli–veneris, Potametum perfoliati, Potametum graminei, Potametum lucentis, Potametum pectinati, Potamo pectinati–Myriophylletum spicati, Equiseto palustri–Iridetum pseudacori, Holoschoeno–Molinietum arundinaceae) in Bosnia and Herzegovina were presented for the first time. Altogether, four NATURA 2000 habitat types were recognized. The study revealed the great diversity of aquatic and marshland vegetation in the study area.