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For this purpose phytoplankton sampling was made on monthly basis for three months during October-December at the following representative stations shown in Table 1. Stations 1, 2, 3, 4, 5, 6 and 14 are for streams and Stations 7, 8, 9, 10, 11, 12, 13, 15 and 16 are stations for the reservoir. In streams, there were disturbances like cattle bathing and cloth washing while in reservoir there were no such activities.

In each sampling station, phytoplankton collection was made towing a net made up of bolting silk net No.25 for 5 minutes. Sedimentation of phytoplankton was made in 4% formaldehyde. Algal monographs of Hustedt (1976) and Prescott (1982) were followed to identify phytoplankton. Drop count method of Trivedy and Goel (1984) was followed for enumeration of phytoplankton and they are expressed as organisms per litre (O/mL). Nygaard (1949), Biligrami (1988) and Palmer (1980) were applied for trophic studies.