On the occurence of the blue-green algae in Lake Balaton

H.-Bartha, Zsuzsanna (1976) On the occurence of the blue-green algae in Lake Balaton. A Magyar Tudományos Akadémia Tihanyi Biológiai Kutatóintézetének évkönyve, 43. pp. 43-46. ISSN 0365-3005

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Abstract

The paper reports the appearance of a blue-green alga, new for the flora of Lake Balaton. The hard, pulpy colonies of Gloeotrichia natans (HEDW.) RABH. with a diameter of 2-4 mm were found on the leaf thorns of Stratiotes aloides L., collected in the environs of the beach of Fűzfő on the 24th of July, 1974. The appearance and rapid spreading of Stratiotes aloides L., and other reed-grass species in Lake Balaton produced new habitats making the appearance of new species possible. This fact has been proved by the presence of G. natans. On the 3rd of September, 1974, blooms of Anabaena flos-aquae (LYNGB.) BRÉB. appearing in spots with a diameter of about 10 cm were observed above the littoral reed-grass stands between the pier of Keszthely and Büdös-canal. According to ELENKIN’s description, the specimens in the material collected perfectly correspond to that of Anabaena flos-aquae f. aptekariana. Up to the present, A. flos-aquae f. jacutica and var. gracilis have been detected in Lake Balaton. These variants and forms distinguishable in nature had been combined by modern taxonomists into the species. This, however, seems to be incorrect, because the remote appearance in space and time of the three variants described from Lake Balaton conveys different information.

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