Seasonal Dynamics of the Testate Amoebae Fauna (Protozoa: Arcellinida and Euglyphida) in Durankulak Lake (Northeastern Bulgaria)

摘要

The seasonal dynamics of diversity, abundance and dominant structure of the testaceans in Durankulak Lake have been studied. The data showed that from January to October the species abundance increased gradually and reached average 3280 specimens/cm3. The greatest taxonomic diversity was observed in summer (49 species) and the smallest diversity was registered in winter (33). The results of the study showed that the maximum of the species richness and abundance varied in different stations and seasons - from 8 to 30 species and from 210 to 8310 specimens/cm~3. From a total of 26 dominant species, only 2 had a high relative significance throughout the year - Trinema enchelys and Euglypha rotunda. Eight species grow significantly and were established as dominants only in some seasons. These are: Trinema lineare, Centropyxis platystoma and Difflugiella oviformis in winter, Corythionella georgiana in spring, Corythionella georgiana, Difflugia minuta, Euglypha acanthophora and Microchlamys patella in summer and Cyphoderia ampulla and Microchlamys patella in autumn.