N.
Savitha
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Aquatic
Microbial Ecology Research Laboratory, Department of Studies in Zoology,
University of
Mysore,
Manasagangotri, Mysore-570 006, India
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Sadanand
M. Yamakanamardi
(Corresponding author)
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Department of Studies in Zoology University of Mysore,
Manasagangotri, Mysore-570 006, India
e-mail :? sadanandmy@gmail.com
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Publication
Data
Paper received:
08 July 2011
Revised received:
29 November 2011
Accepted:
22
December 2011
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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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Copyright
? 2012 Triveni Enterprises. All rights reserved. No part of the Journal can
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conclusions enforced or derived, rest completely with the author(s).
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