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The effects of environmental factors on rotifer assemblage in reservoirs that differ in size and trophic state: eutrophic reservoirs Konče 1 and Konče 3 and mesotrophic reservoir Špilje was examined. Qualitative analyses of summer rotifer composition in Konče 1, 3 and Špilje showed the presence of 13 and 10 taxa, respectively. Rotifer assemblage significantly differed in their community structure, population densities and the occurrence pattern of dominant species, due to the significant differences observed in the environmental parameters measured between Konče 1, 3 and Špilje. The average density of rotifers in Konče 1 and 3 was 50.049 ± 7.825 ind l-1, whereas 2.898 ± 4.08 ind l-1 were recorded in Špilje. In Konče 1 and 3 rotifers were dominated by Brachionus falcatus, Brachionus angularis and Hexarthra mira, contributing 28%, 27% and 23% to rotifer abundance, respectively. In contrast, in Špilje was dominant species Kellicottia longispina, comprising 47% of the total rotifer density. The results suggest that Rotifer abundance, as well as species composition and distribution, often reflect the trophic status of aquatic ecosystems. |
