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Paper Details

Primary Production of Phytoplanktons in Oligomesotrohic Freshwater Body Harsi Reservoir and Their Potential Ecological Significance

V.P. Shrotriy1*, R.K. Garg2 and D.N. Saksena3

Journal Title:Journal of Chemical, Biological and physical sciences

Rates of solar energy flow through the producer-consumer populations of the Harsi reservoir (25470 to 25480 N and 79520 to 77 550 E) were studied. Total 60 common primary producers (phytoplanktons) were identified in the reservoir with highest number of species (35) representing Chlorophyceae with 58.33% as dominant group and 02 species of Dinophyceae with 3.33 as scares group. The average gross primary productivity was recorded similar as 134.82154.94 and 138.35176.27 mg Cm3h-1, though net primary productivity as 87.9497.44 and 80.53107.30 mg C m3 h-1 during 2005-06 and 2006-07. Correspondingly, respiration rate was 47.5557.50 and 58.3768.96 mgCm3h-1 during study periods. The NP: GP was exceeding 0.5, NP: RR was more than 1 and % of respiration was less than 40%, which clearly indicated pytoplanktonic primary productivity was quite high without any definite seasonal pattern and good amount of organic production is available for its transfer to next trophic levels. Hence, the reservoir has a good potential for fish yield, however, additional measures are also recommended to prevent excessive environment of trophic status, development of phytoplanktonic bloom and macrophytes and run-off of organic waste.