Dynamic variation of toxic and non-toxic Microcystis proportion in the eutrophic Daechung Reservoir in Korea

Seung-Hyun Joung; Hee-Mock Oh; Kyung-A You

doi:10.1007/s12275-016-6141-5

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Dynamic variation of toxic and non-toxic Microcystis proportion in the eutrophic Daechung Reservoir in Korea: Seung-Hyun Joung ¹, Hee-Mock Oh ², Kyung-A You ³; Journal of Microbiology 2016;54(8):543-550.
DOI: https://doi.org/10.1007/s12275-016-6141-5
Published online: August 2, 2016

¹Dongjin Engineering Co., LTD. Daegu 740978, Republic of Korea, ²Biochemical and Bioenergy Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea, ³Water Environment Research Department, National Institute of Environment Research, Incheon 22689, Republic of Korea¹Dongjin Engineering Co., LTD. Daegu 740978, Republic of Korea, ²Biochemical and Bioenergy Research Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 34141, Republic of Korea, ³Water Environment Research Department, National Institute of Environment Research, Incheon 22689, Republic of Korea

Corresponding author: Seung-Hyun Joung , Tel: +82-53-600-8109,

Received: 23 March 2016 • Revised: 2 June 2016 • Accepted: 15 June 2016

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Abstract

This study was conducted to determine the environmental factors affecting the level of potentially toxic Microcystis. The long-term tendencies of temperature, precipitation, and water quality factors were analyzed to determine the environmental characteristics of the Daechung Reservoir in Korea, and water samples were directly collected to analyze the dynamics of toxic and non-toxic Microcystis at weekly intervals from May to October 2012. Microcystis was the dominant genus during the study period, and it was composed of potentially toxic and non-toxic Microcystis. The fraction of potentially toxic Microcystis ranged from 6.0% to 61.1%. The amount of toxic Microcystis was highly related to the intracellular microcystin concentration (r = 0.760, P < 0.01). Therefore, the fraction of potentially toxic Microcystis is an important concern in Microcystis blooming because the intracellular microcystin concentration may reflect microcystin levels in the water. The prevalence of potentially toxic Microcystis was highly related to water temperature in Daechung Reservoir (r = 0.585, P < 0.01). Thus, temperature increase during Microcystis blooming may lead to more frequent toxic Microcystis blooms in eutrophic water bodies.

Keywords: temperature;potentially toxic Microcystis;Daechung Reservoir;intracellular microcystin;blooming

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Dynamic variation of toxic and non-toxic Microcystis proportion in the eutrophic Daechung Reservoir in Korea

J. Microbiol. 2016;54(8):543-550. Published online August 2, 2016

DOI: https://doi.org/10.1007/s12275-016-6141-5

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