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Centric diatoms of some European protected area (Croatia, Romania and Spain)

Centric diatom communities of were studied in a few dozen of different lakes in Croatia, Romania and Spain during the last years. Several lakes are situated on protected areas, National Parks, Natura 2000 sites of these countries. The aim of these investigations was first to determine of centric diatom communities of lakes, then to analyse the species composition from a nature conservation point of view. We elaborated a typology of habitats based mainly on substrate, mineralization, water regime and climatology. Then, within the resulting types of environments, we pretend to establish different categories of their ecological status based on nutrients and chlorophyll concentration and other variables related to nature protection. Several lakes were never investigated for centric diatoms, therefore new species was found for Romania for example in Danube Delta (Lake Erentsuk - Thalassiosira gessnerii). Several similarities were found in carstic lakes of Croatia (Lake Plitvice – dominant species: Cyclotella plitvicensis) and Spain (Lake Marquesado – dominant species: C. plitvicensis). We can mention Cyclotella hispanica, described from Lake Banoles (Spain), which is probably endemic species (never found in other countries in Europe). Several species were found which are rare in Europe and are listed in Red List of algae.

Centric diatom; protected area; Croatia; Romania; Spain

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