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Phytoplankton Primary Productivity in Lentic Water Bodies of Bhadravathi Taluk, Shimoga District, Karnataka, India

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Author Affiliations

  • 1 Department of Studies and Research in Botany, Karnataka State Women’s University-Bijapur-586108, Karnataka, INDIA
  • 2 Department of Botany and Seed Technology, Sahydri Science College (Auto), Kuvempu University, Shivamogga- 577203-Karnataka, INDIA

Int. Res. J. Environment Sci., Volume 3, Issue (4), Pages 34-41, April,22 (2014)

Abstract

Phytoplankton primary productivity study is inevitable for the assessment of productivity of any aquatic systems. A comprehensive study was conducted for the period of two years from May 2010 to April 2012 in selected four lentic water bodies of Bhadravathi Taluk. The results were shown the productivity of four stations dynamic in their seasonal and annual means. Phosphate is limiting factor for determine the gross primary productivity in Siddapura Lake, it always have high productivity hence phosphate has highly significant positive correlation (r= 0.66) however, in Koppa Lake is less productivity in both years and have negative correlation (r=-0.63, r=-0.53). Nitrites was significant positive correlation (r=0.55, r=0.59) with gross primary productivity in Siddapura Lake and Koppa Lake and but in case of Koppa Lake, the phosphate is limiting factor. An attempt was taken the correlation coefficient of gross primary productivity with biomass of phytoplankton. Chlorophyll–a (biomass) highly significant positive correlation no more than in Kodihosure Lake (r=0.61, p>0.01); chlorophyll-b, highly positive correlation with gross primary productivity in Siddapura Lake (r = 0.36, p>0.05); Kodihosure Lake (r = 0.59, p>0.01) whereas, the chlorophyll-c content had not seen positive or negative correlations with gross primary productivity. The remarkable fact found to be noticed, the Devanarasipura Lake and Koppa Lake had not have any significant correlations with Chl.a, Chl.b and Chl.c. The primary productivity studies of phytoplankton in lentic water of Bhadravathi taluk is crucial for aqua cultural activities and management preferably in land fisheries.

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