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This study provides baseline information on physico-chemical parameters and the zooplankton community at the Polhena reef, from November 2010 to February 2011, the months of the second inter monsoon to north east monsoon. Water samples were collected from seven stations at 15 day intervals for measurement of physico-chemical parameters and identification and quantification of zooplanktons. The results were; average salinity 28.8 - 35.4ppt, total dissolved solids 29.56 - 39.23 g/L, dissolved oxygen 7.35 - 10.36 mg/L, biological oxygen demand 0.32 - 1.95 mg/L, total hardness 5012 - 5816 mg/L and pH 8. Highest average phosphate concentration was recorded in the dry season as 0.8 mg/L. Highest average nitrite concentration was recorded as 0.063 mg/L in mid December. Though no significant changes were recorded in average DO levels, water temperature, BOD levels, salinities, TDS, TSS and TH levels, pH, and NO 2 - and PO 4 -3 concentrations at different stations, their temporal changes at each site were significant. The highest average total zooplankton abundance was recorded as 45,638.14 individuals/m 3 on February 01, 2011 and that of the lowest was recorded as 6,507.71 individuals/m 3 on December 01, 2010. The zooplankton community was ientified to occupy 17 groups, dominated by copepods, crustacean nauplii and foraminiferans. Their relative abundances were calculated as percentages and copepods made up to about 96% at station 3 in February which was the highest of any group at any station. Nauplii stages, foraminiferans and veliger larvae, peaked at different stations. Journal of the University of Ruhuna 2013 1(2): 9-17

journal of the university of ruhuna

Evaluation of changes in zooplankton community and water quality parameters in the Polhena reef ecosystem observed during November 2010 to February 2011