Seasonal variability and Diversity of Zooplanktons in three treated sewage water fed ponds in CHRIST (Deemed to be University), Bengaluru, Karnataka, India.

Abstract

Monthly and seasonal variances in zooplankton composition, abundance and diversity suggest the current ecological state of the three treated sewage water fed ponds at Main Campus (MCP: 12.555°N, 77.361° E), Bannerghatta Campus (BCP:12.523°N, 77.354°E) and Kengeri Campus  (KCP:12.514°N, 77.261°E) of CHRIST(Deemed to be University), Bengaluru, Karnataka , India. The Present research predicts that changes in zooplankton compositions appear seasonally and location wise in treated sewage water discharged ponds. The population of zooplankton represent 26 genera belong to Rotifera, Copepoda,Cladocer, Ostracoda and Nauplii of various species. The Dominance of genera was in order of Rotifer>Copepoda> Cladocera>Ostracoda. Seasonal changes and monthly changes in abundance were found to be distinct, highest abundances of populations were observed in the order of summer>post-monsoon> winter >monsoon.

The minimum and maximum values of Shannon-Wiener index(H)were observed in the sites during the seasons as MC(Winter):2.39238; KC(Summer):3.10467,Jaccard Evenness Index: KC(Summer): 0.048077; MC(Winter):0.106648,Index of Dominance: KC(Summer): 0.048077; MC(Winter):0.106648. The percentage contribution of each group of zooplankton was found to be: 74% Rotifera>14%Ostracoda>7 % Copepod> 6% Cladocera.