description
Abstract. Algae studies were carried out in some specific biotopes of Slovenia: eutrophic lakes (Kosečki bajer, Sotelsko jezero), peat bogs (Lovrenška jezera, Šijec), waterfalls (Savica, Krka falls, small waterfall on Pohorje), springs (springs at Medvedje Brdo and Pohorje, hot spring at Terme Čatež, mincral spring at Rimski vrelec), brackistt waters (Fiesa lake, Dragonja estuary), hypereutrophic biotopes (manure water, constructed wetlands), aerial biotopes (conerete wall, stony wall, lime tree ttunk (Tilia platyphyllos), limestone rock, Krška jama cave) and the Dragonja Rivcr. Samples were taken seasonally at 26 sampling sites in 1998, 1999, 2000 and 2001. Similarity in species structure and abundance of algae were determined with the Bray-Curtis coefficient of similarity. Altogether, 537 species and subspecies of algae (of nine classes) were determined and most of them belonged to Bacillariophyceae. 146 species and subspecies were identified for the first time in Slovenia; of Ihese 107 belonged to Bacillariophyceac, 28 to Cyanophyceae, six to Chlorophyceae, four to Zygnematophyceae and one to Xanthophyceae. The appearance of almost half of all species and subspecies waslimited to a single sampling site. Eight species (Achnanthes minutissima, Cymbella affinis, Cymbella silesiaca, Gomphonema angustum, Navicula veneta, Navicula sp., Phormidiurn sp. and Trentepnhlia aurea) were present in more than half of all specitic biotopes.