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Diversity and abundance of zooplankton in relation to nitrate–N and total phosphorus levels of 20 minor and medium scale reservoirs in the low country intermediate zone of Sri Lanka were studied in June-October 2013. Total phosphorus content ranged from 0.029 mg L -1  recorded in Wendaruwewa reservoir to 0.529 mg L -1  recorded in Karangamuwa reservoir and Nitrate-N content varied from 1.186 mg L -1  recorded in Adukkane reservoir to 5.625 mg L -1  recorded in Anukkane reservoir indicating that all reservoirs studied are eutrophic. During the present study, a total of 43 species of zooplankton, comprising 31 species of rotifers, 9 species of cladocerans and 3 species of copepods were recorded. Number of zooplankton species in any one reservoir, which ranged from 4 to 13, was significantly correlated with the nitrate-N content (p Diacyclops nanus,  which was present in 15 reservoirs. Abundance of zooplankton ranged from 4 individuals L -1  recorded for  Alona monocantha  and  Chydorus parvus  in Wendaruwewa and Metiyagane reservoirs respectively to 1017 individuals L -1  recorded for  Filinia terminalis  in Galewela reservoir. Margalef index which ranged from 0.532 in Adukkane reservoir to 2.096 in Dewahuwa reservoir, was significantly correlated with nitrate-N content of water (p 0.05).  Keratella quadrata  was present only in Anukkane reservoir where the nitrate-N content was the highest and therefore it may be considered as a bio-indicator of high levels of nitrate-N. Eutrophic conditions of theses reservoirs may possibly be due to runoff of nutrients from agricultural fields as these are located in an intense agricultural area. Therefore, it is necessary to take immediate action to control the overuse of inorganic fertilizer in this area so that contamination of water bodies with nutrients can be minimized.

Community structure of zooplankton and trophic status of some inland reservoirs in the low country intermediate zone of Sri Lanka