Journal of Applied and Natural Science 4(1):16-22(2012)
Diel dynamics of heleoplankton in relation to some physico-chemical attributes of water in an aquaculture tank in Guwahati, Assam
Janardan Pathak and M. M. Goswami
1G.U. Model H.E. School, G.U. Campus, Jalukbari, Guwahati-781 014, INDIA 2Department of Zoology, Gauhati University, Jalukbari, Guwahati-781 014, INDIA *Corresponding author. E-mail: email@example.com
Abstract : Diurnal fluctuation of the phytoplankton and zooplankton population (numerical densities) and the physico-chemical attributes of water are studied in an aquaculture pond at Guwahati, Assam. In the 24 hour diel cycle, the phytoplankton and zooplankton show significant (t-test, p < 0.01) variation in their numerical density at an interval of 4 hours. The studied physico-chemical parameters of water included Temperature, Total Alkalinity (TA), Total hardness (TH), Dissolved Oxygen (DO), Free Carbon dioxide (FCO2) and pH are analyzed concurrently, which reveals a significant fluctuation (t-test, p< .01) in the day and night hours. Multivariate correlation analysis portrays significant and positive correlations among the total population density of phytoplankton with respect to water temperature (r = 0.845, p<0.05) and pH (r = 0.881, p< 0.01) while it maintains significant negative correlations with TA (r = -0.837, p< 0.05), TH (r = -0.768, p< 0.05) and FCO2 (r = -0.830, p<0.05). However, total numerical density of zooplankton reveals positive and significant correlations with TA (r = 0.842, p< 0.05) and FCO2 (r= 0.758, p< 0.05) while it shows significant negative correlations with water temperature (r = -0.906, p< 0.01) and pH (r =- 0.912, p< 0.01).
Keywords : Aquaculture pond, Diurnal variation, Heleoplankton, Physico-chemical parameters