Study on population of plankton in the Nanak Sagar reservoir of Uttarakhand, India.

The plankton of the lentic water of Uttarakhand Nanak Sagar reservoir were studied for two years (2003 and 2004). A total of 36 taxa of phytoplankton were collected from two sites of reservoir. They are chlorophyceae (17) and Bacillariophyceae (14) being the main components and cyanophyceae with 5 species. Maximum number of chlorophyceae were encounter during March where as the species richness of diatoms was maximum during October. There were 18 genera/ species of various zooplankton (Rotifera) and crustacean in water of the Nanak Sagar reservoir Uttarakhand but their was not a single genera/species of Protozoa was identified during two year of study (2003-2004). Chief components of zooplankton are rotifers and crustaceans including cladocerans, cyclopoid and copepods the phytoplankton showed monthly seasonal and yearly fluctuation in the study.