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KMID : 1171820040190020023
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Journal of Environmental and Sanitary Engineering
2004 Volume.19 No. 2 p.23 ~ p.29
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Effects of Predator Addition to the Algicidal Bacterium in Controlling Diatom Stephanodiscus hantzschii Dominating the Eutrophic Pal’tang Reservoir, Korea
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Kim Baik-Ho
Ka Soon-Kyu
Han Myung-Soo
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Abstract
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An algicidal effect of endemic algicidal bacterium (Pseudomonas putida) and rotifer zooplankton (Brachionus calyciflorus) on diatom Stephanodiscus hantzschii were examined in the filtered water, and were compared with those of bacterium plus ciliate. Bacteria removed as 80% of the diatom within 3.5 days, while ciliate and zooplankton suppressed 57% and 40% of diatom during the same period, respectively. Mixed treatment of bacteria plus ciliate removed as 54% of diatoms, while that of bacteria plus zooplankton decreased as 85%. Although single bacteria and mixed treatment of bacteria plus zooplankton quickly decreased the diatom in the initial of experiment, bacteria plus ciliate perfectly removed the diatom in culture flask within 5.5 days of the study. On the other hand, other single and mixed-treatments did not clear the diatom during the same period, and over 10% of them still remain in culture flask. Predator biomass in the presence of algicidal bacteria showed the growth patterns; zooplankton gradually decreased, and ciliate sustained over 0.5 cells/ml. These results indicated that the addition of ciliate to the algicidal bacterium in controlling the diatom Stephanodiscus hantzschii is more effective than that of zooplankton. Therefore, this synergistic interaction relationship between the bacterium and ciliate play an important role in the bio-manipulation using bio-agents to control the diatomal bloom in freshwater lakes and streams.
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KEYWORD
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algicidal bacterium, ciliate Stentor roeselii, zooplankton Brachinous calyciflorus, mixed treatment, filtered water
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