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Zooplankton diversity of three freshwater lakes with relation to trophic status, Gulbarga district, North-East Karnataka, South India

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Author(s): Rajashekhar M. | Vijaykumar K. | Zeba Parveen

Journal: International Journal of Systems Biology
ISSN 0975-2900

Volume: 1;
Issue: 2;
Start page: 32;
Date: 2009;
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Keywords: Zooplankton | trophic status | eutrophication | Gulbarga

ABSTRACT
Our present work focused on the taxonomic composition of zooplankton in three freshwater lakes(Sharanabasaveshwara Lake and Gobbur Lake, Bosga Lake,) of Gulbarga district during October 2005 toSeptember 2006. In present investigation 39 species of zooplankton were to the different groups i.e.,Rotifera, Copepoda, Cladocera, Ostrocoda. During study period in the lake Sharanabasaveshwara, thezooplankton was composed of nine taxa of Rotifera, four taxa of Cladocera, four taxa of Copepoda andthree taxa of Ostrocoda, while in Bosga lake ten taxa of Rotifera, six taxa of Cladocera, four taxa ofCopepoda, three taxa of Ostracoda and in Gobbur lake thirteen taxa of Rotifera, nine taxa of Cladocera,four taxa of Copepoda and three taxa of Ostrocoda, were encountered respectively. Comparison of theobtained results with those of earlier investigations performed during 1986-1987 showed that changes haveoccurred in the interval. The total zooplankton composition is significantly changed in all the three waterbodies. Comparison of diversity and density in three lakes was studied with diversity indices. The studyresults clearly indicate intensified eutrophication of lakes. These fragile ecosystems have to prevent fromfurther eutrophication.
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