engleski

Standing waters of Hungary, Croatia and Spain: international importance, vegetation change and some objectives for nature conservation by the Dinophyta species.

Dinoflagellates are microscopic, unicellular, flagellated, often photosynthetic protists, commonly regarded as "algae". Both heterotrophic and autotrophic dinoflagellates are known. Besides being important primary producers, and therefore an important part of the food chain, dinoflagellates are also known for producing nasty toxins, particularly when they occur in large numbers, called "red tides" because the cells are so abundant they make the water change color. Free-living dinoflagellates are a successful group of aquatic organisms and the taxa highly adapted to various trophic conditions. In spite of the importance of the Dinophyta in many freshwaters, very little is known about factors that influence their occurrence. Accumulating information on Dinophyta ecology did not solve some crucial questions since much of it remained scattered without substantial ecological analyses. In this paper our purpose is to investigate the importance of Dinophyta species in various water types and compare the distribution of Dinophyta species found in three countries. The objective is to determine the relative level of eutrophication by comparing different standing waters using Dinophyta taxa in protected regions of Spain, Croatia and Hungary. A total of 225 samples collected from Spanish, Croatian and Hungarian water bodies were analyzed for Dinophyta species and compared to limnological characteristics.

dinoflagellates; level of eutrophication

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