Study on Ecology of zooplankton profusion in Bhoj wetland, India

Abstract

The influence of physicochemical properties of wetland, on its zooplankton composition and
abundance were investigated for two years between February 2008 and January 2010. In both the years,
total of 62 species of zooplankton were identified. At all the stations of the water body Rotifera recorded
the highest percentage of 45% followed by cladocera (29%), Protozoa (13%), Copepoda and Ostracoda
(8 and 4%) respectively. In terms of density, total zooplanktonic density during 1st year was 7395 Ind.l-1
that increased to 8543 Ind.l-1 in the 2nd year. In the first year, Copepoda (2 Ind.1-1 to 2415 Ind.1-1)
constituted the largest group making up 63.41% of the zooplankton population density, this was
followed by Cladocera (21.27%) with having numerical density ranges between (3 Ind.1-1 to546 Ind.1-1)
and Rotifera group (14.15%) having a density varied from 2 to 207 Ind.1-1. The genus Bosmina (34.7%)
dominated the Cladoceran group and Polyarthra and Brachionus (19.8 and 18.7%) recorded highest in
terms of percentage among the Rotifera group, while as the genus Cyclops (51.5%) recorded the
highest number among the Copepoda group and was also dominant genus among the zooplankton
genera. During second year of study period, the Copepoda (70.08%) which had a density variation
between 2 Ind.1-1 to 4491 Ind.1-1 and this was followed by Cladocera (18.67%) with numerical density
ranges between 3 to 337 Ind.1-1 and Rotifera (9.08%) having density between 2 Ind.1-1 to 171 Ind.1-1.
The genus Chydorus (21.1%) dominated the Cladoceran group and genus Lecane (22.0%) recorded
highest in terms of percentage among the Rotifera group, while as the genus Cyclops (75.0%) recorded
the highest number among the Copepoda group and was also dominant genus among the zooplankton
genera. The water body is receiving domestic discharge leading to large amount of nutrient inputs and
high amount of phosphate and nitrate in the water body indicates that water is eutrophic in nature.