PHYTOPLANKTON ECOLOGY AND DYNAMICS IN SUB-TROPICAL BAIGUL RESERVOIR (UTTARAKHAND)
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Authors
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POONAM TRIPATHI
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A. P. SHARMA
Abstract
The present study deals with phytoplankton community of Baigul reservoir located in the plain region of hill state, Uttarakhand. Phytoplankton community of the reservoir comprised 54 species belonging to Chlorophyceae (27), Bacillariophyceae (18), Cyanophyceae (6) and Dinophyceae (3). Bacillariophyceae was the largest contributor to the total phytoplankton population followed by Chlorophyceae, Cyanophyceae and Dinophyceae. Average phytoplankton density was highest in comparatively shallow zone (0-5 m) at lentic (23.17 x 104 cells/l) and lotic (15.8 x 104 cells/l) sectors in June. In lentic zone at 10.0 m, phytoplankton density was comparatively low (16.51 x 104 cells/l) during same period. Minimum density of phytoplankton was observed in February (5.31x104 cells/l) and April (3.35x 104 cells/l) in 0-5 m depth in lentic zone. In 10.0 m depth the phytoplankton density was minimum in February (4.1x 104 cells/l). Contribution of different phytoplankton groups viz., Bacillariophyceae (56.59-59.65%), Chlorophyceae (20.59- 24.33%), Cyanophyceae (16.12-20.59%) and Dinophyceae (1.33-2.95%) differed between lentic and lotic zones and also varied with depth. Species like Melosira granulata and Microcystis aeruginosa were most prominent among phytoplankton. Reservoir showed two pulses of phytoplankton during summer (May-June) and post-monsoon (November). Diversity of phytoplankton was more in summer than monsoon and winter seasons. Qualitative and quantitative richness of phytoplankton was higher in lentic zone.
Key words: Reservoir, phytoplankton, algal bloom, lentic, lotic
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