SEASONAL FLUCTUATIONS IN ZOOPLANKTON OF A FRESHWATER LAKEO. SUDHAKAR , P. NEELA RANI, G. VENUGOPAL AND J.P. GEORGE
The present study was conducted in Powai Lake, Mumbai. Water samples were collected and analysed for various physico-chemical parameters. Qualitative and quantitative analysis of zooplankton was also done. The zooplankton samples were observed to contain 14 species belonging to Copepoda, Cladocera and Rotifera groups. In the order of their abundance, these three groups were Copepoda, Cladocera and Rotifera. Copepods were most abundant during summer with a mean of 296 nos./L. This was followed by 277 nos./L during spring and 217 nos./L in winter. Low population of this group was observed in monsoon with 171 nos./L. Cladocerans were most abundant during spring with 327 nos./L. This was followed by a second peak of 305 nos./L during winter. In summer, the maximum of cladocera was 282 nos./L. Low abundance of 254 nos./L was observed during monsoon. Rotifers were most abundant in winter with 220 nos./L . This was followed by a second peak of 204 nos./ L during spring. Third peak abundance of rotifers was recorded during summer with 157 nos./L. In monsoon, this group was least abundant with a population of 154 nos./L in the lake.
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