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Five Serbian reservoirs contain different fungal propagules

Branislav Rankovi ¹

     Faculty of Science, Institute of Biology and Ecology, 34000 Kragujevac, Serbia and Montenegro

This paper presents results of a mycological survey conducted in five large reservoirs in Serbia (Sjenica, Barje, Garai, Meðuvrje and Ovar-Kablar) that have different hydrobiological and production characteristics. The sampling was conducted in March, June, August and October 2002. Quantitative analysis of fungal communities showed that the average number of colony-forming units in these reservoirs was 1966–5682/L of water. The highest number of CFUs was found in the -mesosaprobic (Class III) Ovar-Kablar Reservoir and the lowest was in the oligosaprobic (Class I) Sjenica Reservoir. CFUs were higher in samples taken near lake bottoms and in littoral zones rich with macrovegetation than in the middle depths. In these reservoirs 48 species were identified from 720 isolates. The dominant genera were Penicillium, Aspergillus, Cladosporium, Fusarium, Rhizopus, Mucor, Phoma and Verticillium. The autochthonous aquatic fungal community comprised these species: Achlya americana, A. diffusa, A. racemosa, Dictyuchus sterile, Isoachlya toruloides, Leptomitus lacteus, Pythium ultimum, Saprolegnia ferax, S. hypogyna and S. monica. My results indicate that aquatic fungi on the whole are better represented in lakes with a higher trophic status.

Key words: allochthonous, autochthonous aquatic fungi, reservoir