Ref ID : 7838
C.S. Patil and B.Y.M. Gouder; Ecological Study of Freshwater Zooplankton of a Subtropical Pond (Karnataka State, India). Int.Revue ges.Hydrobiol. 70(2):259-267, 1985
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Fortnightly records of the biotic and abiotic conditions in a subtropical natural pond were made over a period of 14 months with a view to find out the abiotic causes of fluctuations in the zooplanktonic populations. Statistical anaylsis of simple correlations among the abiotic factors revealed direct relationships between water temperature, DO and pH and an inverse relationship between DO and -PO4 at statistically significant levels (P<0.01). The relationships between the physical and chemical factors and the zooplanktonic groups were evaluated by partial and multiple correlation coefficients. The causes for variation in the populations were established by stepwise multiple regression analysis. The populations of copepopds and rotifers, respectively, were correlated at the 5% and 1% levels of significance to conductivity and -PO4 which might be indirectly affected by bicarbonates and phytoplankton growth. The occurrence of two peaks of zooplankton, one in winter and another in postsummer, were observed to follow the Microcystis aeruginosa bloom.