Seasonal and diurnal variations of some abiotic parameters and plankton population in Mushahari Ox-Bow lake of Muzaffarpur district (north Bihar).

摘要

Diurnal variations of some abiotic parameters and plankton population in Mushahari Ox-bow lake was studied during spring, summer, monsoon and winter seasons of 2011. Phytoplankton showed increased number during day time. It was found that water temperature, pH, DO₂ and HCO-₃ increased during day time which decreased during night hours. The amount of free CO₂ was also noticed higher during night hours. There were positive correlation between water temperature, pH, dissolved oxygen (DO₂), bicarbonate (HCO-₃) and a negative correlation with temperature and free CO₂ in most cases. Thus it may be concluded that diurnal variation of abiotic parameters and biotic population in Mushahari ox-bow lake were governed by the result of interaction of various environmental factors. No single factor was responsible for the fluctuation of abiotic variations and plankton population in Mushahari ox-bow lake. Fluctuations of plankton might be result of interactions off abiotic parameters, fertility of water body and their consumption by fishes as food.