The Biobrio 8(3 & 4), 2021

Primary productivity of the phytoplankton in two perennial ponds of Madhepura district, North Bihar

Avinash Kumar, Jai Nandan Prasad Yadav & Arun Kumar

ABSTRACT:

The present study has been carried out to evaluate the status of phytoplankton primary productivity in two perennial ponds, namely Puraini (Pond-1) and Baghmara (Pond-2) of Madhepura district, North Bihar. The experiment was conducted monthly from March, 2019 to February, 2020. The rate of primary productivity was determined in situ using light and dark bottle oxygen method. The rate of gross primary production varied between 2.475 g C/m2/day and 6.615 g C/m2/day in Pond-1 and between 2.385 g C/m2/day and 5.935 g C/m2/day in Pond- 2 with mean of value 4.35±0.36 g C/m-2/day and 4.0±0.34. The gross production was relatively higher in Pond-1 than in Pond-2. The rate of production was maximum in summer may be due to penetration of more light into water column, longer sunshine hours and increased phytoplankton density facilitates higher rate of photosynthesis, while minimum during monsoon season probably due to dilution effects of rainwater on phytoplankton density might bring about lower productivity value...

Keywords:    

Primary productivity, perennial ponds, GPP, NPP, CR, environmental factors

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