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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


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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