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Manuscript 1019; Received 25 March 2003; Finally accepted 8 January 2004; © Zoo Outreach Organisation 1466 ABSTRACT Four copepods and seven cladoceran species were identified in the zooplankton samples collected from fifty freshwater bodies, in and around Dharmapuri District, Tamil Nadu including during September 1999 and April, 2000. Ecological indices for similarity and dissimilarity, index of dominance, index of diversity, index of evenness and species richness indicate variations pertaining to winter and summer zooplankton density. Zooplankton populations of winter and summer are discussed.

Ecological indices of freshwater copepods and cladocerans from Dharmapuri District, Tamil Nadu