Title |
Dynamic variation of toxic and non-toxic Microcystis proportion in the eutrophic Daechung Reservoir in Korea |
Author |
Seung-Hyun Joung1*, Hee-Mock Oh2, and Kyung-A You3 |
Address |
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 Korea |
Bibliography |
Journal of Microbiology, 54(8),543-550, 2016,
|
DOI |
10.1007/s12275-016-6141-5
|
Key Words |
temperature, potentially toxic Microcystis, Daechung
Reservoir, intracellular microcystin, blooming |
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. |