Cyanophytes on limestone rocks in the Szopczański Gorge (Pieniny Mountains) – their ecomorphology and ultrastructure

This study is devoted to the ecomorphology and ultrastructure of cyanophytes on limestone rocks collected in the Szopczański Gorge (Pieniny Mountains) during the years 2006-2008. There were selected cyanophyte species for examination such as following: <em>Nostoc microscopicum</em>, <em>Phormidium favosum</em>, <em>Leptolyngbya foveolarum</em>, <em>Tolypothrix distorta </em>var. <em>penicillatum</em>, <em>Pseudanabaena catenata</em>. The ultrastructural analysis (TEM) confirmed that the structure and placement of the thylakoids is genus/species specific.

Distribution of blue-green algae (Cyanophyta) in streams of Mt. Stara planina: Serbia

Distribution of blue-green algae was studied at 14 sites along five streams in the Stara Planina mountains. Algological samples were taken from the community of benthos and periphyton in the spring (March-May 1991), summer (June-August 1991, August 1996, July 1997), and autumn (September-November 1991, September 1997). Algae of the classes Chamaesiphonophyceae (species of the genus Chamaesiphon) and Hormogoniophyceae (species of the genera Symploca, Phormidium, Oscillatoria, Schizothrix, Nostoc, Rivularia Homoeothrix, Tolypothrix, and Plectonema) were recorded. The species Chamaesiphon cylindricus, Symploca radians, Phormidium coutinhoi, Nostoc coeruleum, Homoeothrix janthina, Plectonema thomasinianum, and Tolypothrix distorta were registered herein first time in Serbia. Occurrence of blue-green algae in highland brooks and rivers of the Stara Planina mountains was monitored in relation to a large number of abiotic factors e.g. altitude above level, stream dimensions (width and depth), substrate bottom type (%), current flow rate, water temperature and pH oxygen concentration, concentrations of nitrates and phosphates, and BOD5, using Principal Coordinates analysis (PCX)).