DIEL VARIATION OF WATER QUALITY AND ZOOPLANKTON COMMUNITY IN A FRESH WATER POND OF PATNA, BIHAR, INDIAMEENA SINGH (SWARUP) AND R.K, SINHAAbstract The water quality has a direct impact on the aquatic biota and their movement. The present work was done in all the seasons once for the study of water quality during 24 hours. It also reports the effect of pH. DO, transparency, carbonate alkalinity, bi-carbonate alkalinity and free CO2 on the vertical movement and abundance of zooplankton during day and night. The total abundance of zooplankton was less in the surface water due to solar illumination when they migrate to the bottom to save themselves from their predators and the level of oxygen is also high. At night they migrate to the surface due to the depletion of oxygen at the bottom as respiratory activity dominates photosynthetic activity. Phytoplankton that are fed by zooplankters also migrate to the surface at night for respiration.
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