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Seasonal Variations and Diversity of Zooplanktons Community Structure in Chenani Hydroelectric Reservoir, its Feeding Channel and River Tawi, Udhampur, J&K, India

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Author Affiliations

  • 1Department of Zoology, University of Jammu, Jammu (180006) J&K INDIA

Int. Res. J. Biological Sci., Volume 2, Issue (4), Pages 37-43, April,10 (2013)

Abstract

Reservoir, its connecting channel and feeder river Tawi were studied for a period of one year from September 2011 to August 2012 for its water quality parameters and zooplanktons community structure. Physico-chemical parameters viz. air temperature, water temperature, transparency, pH, DO, FCO2, carbonates, bicarbonates, chloride, calcium, magnesium, sulphate, phosphate and nitrate were analysed which showed seasonal fluctuations of these water bodies. Water remained alkaline throughout the study period with pH ranged from 8.1 to 8.9. Parameters viz. bicarbonates, calcium, magnesium and transparency showed increase during post monsoon (September) to winter (February) where as FCO, chlorides, phosphates, sulphates and nitrates showed decline during this period. However much fluctuation have not been reported in the concentration of phosphates, sulphates and nitrates which showed an increase during rainy season. Both qualitatively and quantitatively analysis were made to investigate the seasonal fluctuations and distribution of zooplanktons. Qualitatively zooplanktons were composed of six species of Protozoan (Centropyxis aculeate, Nebela collaris, Trinema enchelys, Euglena gracilis, Arcella vulgaris and Amoeba sp.), five species of Rotifera (Lepidella ovalis, Colurella adriatica, Branchionus angularis, Monostyla lemaris and Cephalodella intuta), three species each of Ciliata (Paramecium sp , Euglypha ciliate and Vorticella convallaria), Cladocera (Daphnia silmilis, Alona monocantha and Alona costata) and Copepoda (Eucyclops sp, Mesocyclops sp., and Nauplius larva of Copepod). Quantitatively Protozoa was dominant throughout the study period with Trinema enchelys, Euglena gracilis and Arcella vulgaris constituting the largest share of Protozoan. Copepoda was the second dominant group present throughout the study period followed by Cladocera, Rotifera and last were the group ciliate. Zooplanktons species richness, diversity and evenness were calculated. Values of Margalef’s index (R= 2.89) and Menhinicks index (R=0.92) were found higher at site 6 and site 5 and lowest (2.81 and 0.68) at site 1 respectively. Simpson index (I=0.30) was found higher at site 5 and lowest (0.14) at site 1. Shannon’s-Weiner’s index (H’) values (2.75) was found highest at site 1 and lowest (2.29) at site 5. Maximum species evenness (0.92) was recorded at site 1 while minimum (0.79) at site 5.

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