Assessment of Primary Productivity of Hattikuni Reservoir, Yadgiri District, Karnataka, India

Primary production is the assessment of an ecosystem's ability to build up, at the expense of external energy both radiant and chemical; primary organic compounds of high chemical potentials for further transformation and flow to higher system levels. The purpose of this study is to provide baseline information about the primary productivity of Hattikuni Reservoir, Yadgiri District, Karnataka, India for effective reservoir management. The study was carried out for a period of one year (February 2015 to January 2016) in each first week of the month using ‘light and dark bottle’ method. In the present study, the maximum values of GPP observed in pre-monsoon season 0.95 gC/m3/hr and minimum in monsoon season 0.55 gC/m3/h, NPP was found maximum in post monsoon season 0.48 gC/m3/hr and minimum in monsoon 0.27 gC/m3/hr and CR was found maximum in pre monsoon season 0.59 gC/m3/hr and minimum in monsoon season 0.23 gC/m3/hr respectively. The findings indicate that higher productivity of Hattikuni reservoir favors better growth of zooplanktons and higher organisms in the reservoir.