Zooplankton diversity and physico-chemical conditions in three perennial

ponds of Virudhunagar district, Tamilnadu

 

T. Rajagopal*1, A. Thangamani2, S.P. Sevarkodiyone3, M. Sekar4?and G. Archunan1?

 

1Centre for Pheromone Technology, Department of Animal Science, School of Life Sciences,

Bharathidasan University, Tiruchirappalli - 620 024, India

2Department of Zoology (UG), 3Post Graduate and Research Department of Zoology,

Ayya Nadar Janaki Ammal College (Autonomous), Sivakasi - 626 124, India

??????????????????????????????? 4Tamil Nadu Forest Department, Arignar Anna Zoological Park, Vandalur, Chennai - 600 048, India

(Received: September 26, 2008; Revised received: February 10, 2009; Accepted: March 02, 2009)

 

Abstract: Plankton diversity and physico-chemical parameters are an important criterion for evaluating the suitability of water for irrigation and drinking purposes. In this study, we tried to assess the zooplankton species richness, diversity, and evenness and to predict the state of three perennial ponds according to physico-chemical parameters. A total of 47 taxa were recorded: 24 rotifers, 9 copepods, 8 cladocerans, 4 ostracods and 2 protozoans.? More number of zooplankton species were recorded in Chinnapperkovil pond (47 species) followed by Nallanchettipatti (39 species) and Kadabamkulam pond (24 species). Among the rotifers, Branchionus sp. is abundant. Diaphanosoma sp. predominant among the cladocerans. Among copepods, numerical superiority was found in the case of Mesocyclopes sp. Cypris sp. repeated abundance among ostracoda.? Present study revealed that zooplankton species richness (R1 and R2) was comparatively higher (R1: 4.39; R2: 2.13) in Chinnapperkovil pond. The species diversity was higher in the Chinnapperkovil pond (H?: 2.53; N1: 15.05; N2: 15.75) as compared to other ponds. The water samples were analyzed for temperature, pH, electrical conductivity, alkalinity, salinity, phosphate, hardness, dissolved oxygen and biological oxygen demand. Higher value of physico-chemical parameters and zooplankton diversity were recorded in Chinnapperkovil pond as compared to other ponds. The zooplankton population shows positive significant correlation with physico-chemical parameters like, temperature, alkalinity, phosphate, hardness and biological oxygen demand, whereas negatively correlated with rainfall and salinity.? The study revealed that the presence of certain species like, Monostyla sp., Keratella sp., Lapadella sp., Leydigia sp., Moinodaphnia sp., Diaptomus sp., Diaphanosoma sp., Mesocyclopes sp., Cypris sp. and Brachionus sp. is considered to be biological indicator for eutrophication.??

Key words: Zooplankton, Physico-chemical parameters, Shannon?s index, Species richness, Perennial ponds

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