Ecology, Environment and Conservation Paper

Vol.17, Issue 2, 2011; Page No.(335-341)

ZOOPLANKTON DIVERSITY A TOOL TO ASSESS AQUATIC POLLUTION IN THE LENTIC ECOSYSTEM

B. Padmanabha

Abstract

In pollution stressed environment, change in the community structure is reflected in the diversity pattern of the component species. These changes can be quantified as diversity indices, which are useful in water quality monitoring. In this study, Water Quality Index, the diversity and density of zooplankton carried was out in the four lakes of Mysore city (Kamana, Karanji, Kukkarahally and Dalavai lakes) for two years (2008-2010). Different diversity indices are computed and according to the results, highest diversity index recorded in the Kamana lake followed by Karanji lake, Kukkarahally lake and lowest in the Dalavai lake. Highest dominance index and water quality index recorded in the Dalavai lake followed by Kukkarahally lake, Karanji lake and lowest in the Kamana lake. According to the Water quality Index, species diversity scale of Wilhm & Doris (1968) and Staub et al., (1970), Sequential Comparison Index (SCI) the water of Kamana lake and Karanji lake is moderately polluted whereas heavily polluted in the Kukkarahally lake and Dalavai lake. According to Jaccard index, it appears that Kamana lake and Karanji lake pair showed highest similarity in ecological parameters and hydrographical conditions. But Kamana and Dalavai lake pair shows lowest similarity or highest dissimilarity in ecological parameters and hydrographical profile.

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