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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Nov 2012, 33 (6)                                     Back


nstantaneous and historical temperature effects on a-pinene

Studies on abundance of zooplanktons in lakes of Mysore, India

 

Author Details

 

N. Savitha

Aquatic Microbial Ecology Research Laboratory, Department of Studies in Zoology, University of

Mysore, Manasagangotri, Mysore-570 006, India

Sadanand M. Yamakanamardi

(Corresponding author)

Department of Studies in Zoology University of Mysore, Manasagangotri, Mysore-570 006, India

e-mail :? sadanandmy@gmail.com

 

 

Publication Data

Paper received:

08 July 2011

 

Revised received:

29 November 2011

 

Accepted:

22 December 2011

 

Abstract

This is the first comprehensive ecological study on the abundance of zooplankton in Kalale, Alanahalli and Dalvoy lakes of Mysore. The abundance of zooplankton as well as their relation with physico-chemical parameters was analyzed, every month in these lakes from June 2008-May 2010. The mean abundance of Rotifer (281 Org l-1), Cladocerans (27 Org l-1) and total abundance of zooplankton (343 Org l-1) were more and? significantly different in Dalvoy lake; whereas, in Kalale lake the mean abundance of Rotifer (19 Org l-1), Cladocerans (3 Org l-1) and total abundance of zooplankton (79 Org l-1) and in Alanahalli lake the mean abundance of Rotifer (84 Org l-1), Cladocerans (9 Org l-1) and total abundance of zooplankton (149 Org l-1) were significantly less. However, the abundance of Copepods and Ostracods was similar in all the three lakes studied. The water bodies of Kalale lake were less polluted when compared to Alanahalli and Dalvoy lakes. The increases in conductivity, Chl a, turbidity, phosphate, carbon-di-oxide and total anions in Alanahalli and Dalvoy lakes may be attributed to the various anthropogenic activities in the catchment areas.? Interrelationships between zooplankton variables and physico-chemical parameters were calculated using Pearson?s correlation co-efficient (r) which revealed (25) significant (P<0.05) relationships (More (11) in Dalvoy lake and moderate (7) in Alanahalli and Kalale lakes). The stepwise multiple regression analysis (r2) showed out of 21 physico-chemical? parameters studied, as many as 12 were positively controlling the abundance of zooplankton, where as the phosphate and chloride were negatively controlling the total abundance of zooplankton and the abundance of ostracods respectively.? The results obtained have been discussed in the light of the present literature available in the field of aquatic microbial ecology.

 

Key words

Rotifer, Cladoceran, Copepod, Ostracod, Zooplankton

 

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