Phytoplankton community analysis in artificially aerated lake Naukuchiatal
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Date
2018-08
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G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand)
Abstract
The present study was done in an artificially aerated Lake Naukuchiatal to examine phytoplankton community structure and primary productivity along with various pyshico-chemical parameters of the lake. Three sampling sites named as S1 (Pump house), S2 (Midpoint) and S3 (Chanauti) were selected for the study. S1 was present in littoral zone whereas S2 and S3were located in the limnetic part of the lake. Samples were collected fortnightly from surface, 8m, 16m and 32m depths to evaluate the water quality and phytoplankton community for a period of 8 months from October 2017 to May 2018. A significant difference in some parameters of water quality viz. temperature, DO (S3), nitrate and phosphate vertically were recorded. Whereas differences in TDS, conductivity, DO (S2), CO2 and alkalinity were not significant and almost uniform limnological conditions were observed throughout the water column of the lake as consequence of aeration. A total of 28 species of phytoplankton were reported belonging to 3 groups viz, Bacillariophyceae (11 species), chlorophyceae (14 species) and cyanophyceae (3 species). Members of Bacillariophyceae and Chlorophyceae were found to be dominant during the study period. Phytoplankton population was recorded upto the bottom waters in contrast to the non-aerated water bodies as mixing of entire water column allows phytoplankton to be distributed across the whole water column. Gross primary productivity of the lake showedminimum value in February (5.21 ±0.52 mgC/m3/hr) and maximum in May (12.04 ±0.98 mgC/m3/hr)and the lake reflected mesotrophic conditions during the entire study period. Despite organic pollution, dissolved oxygen was available at each depth. The details of the findings of the investigation is presented in different chapters of the thesis
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