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        Perturbations and Regime Shift in an Aquatic Ecosystem along with Adaptation of Biota Due to Climatic Extremes

        Satya Panigrahi,Ajit K. Mohanty,Thanapandi Ramesh,K. Jahir Hussain,Manoj K. Samantara,M. V. R. Prasad,Kamala Kanta Satpathy 대한환경공학회 2012 Environmental Engineering Research Vol.17 No.-

        The present study aims to observe the post tsunami changes occurring in a small lake. Physicochemical and biological characteristics of Kokilamedu lake (KKM) revealed drastic changes when compared to the pre-tsunami conditions. The monthly average water quality indicated that salinity was increased sharply (11.31 practical salinity unit [psu] in June 2008) from a lowest pre-tsunami value of 1.19 psu (range, 1.19 to 3.41 psu). Similarly, the NO3+NO2 values were increased significantly (0.49 μmol/L in 1996 to 74.47 μmol/L in 2006). The concentration of SiO4 increased remarkably from an average of 64.87 μmol/L during pre-tsunami conditions to 309.71 μmol/L during post-tsunami conditions (2009–2010). Inorganic phosphate was also increased to a maximum of 9.59 μmol/L from a pre-tsunami maximum of 1.09 μmol/L. Chlorophyll-a values did not respond to the increased nutrient stoichiometry and declined during posttsunami conditions. However, there was a significant improvement in oxygen concentration (2006–2010 average, 8.27 mg/L) of the lake compared to the 1996 values (1994–1995 average, 5.94 mg/L). The algal component is now dominated by the blue-green algae which prevailed over the green algae in the pre-tsunami conditions. Certain marine fishes adapted to this altered ecosystem due to a probable regime shift. Remarkably, out of 20 species, five were marine, nine were brackish, and the remaining six were freshwater species. Preand post-tsunami observations from a control site did not exhibit a remarkable shift during 1994–1996 and 2010, whereas a shift was apparent in the case of KKM.

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