Inhibition of Cochlodinium polykrikoides related with abnormal high temperature by large among of Changjiang River discharge along the southern coastal water, Korea

Title
Inhibition of Cochlodinium polykrikoides related with abnormal high temperature by large among of Changjiang River discharge along the southern coastal water, Korea
Author(s)
백승호; 이민지; 임영균; 안치용
KIOST Author(s)
Baek, Seung Ho(백승호)Lee, Minji(이민지)Lim, Young kyun(임영균)
Publication Year
2018-04-27
Abstract
Dinoflagellate Cochlodinium polykrikoides bloom during the past 20 years have been consistently present along the southern coastal water, whereas they abruptly disappeared in 2016. So, to understand these phenomena, physico-chemical and biological data were collected along the Tongyeong coast through a biweekly field survey from June to September. In 2016, the amount of Changjiang River discharge from China, which can affect coastal environments via ocean currents, was relatively larger than in the past four years, reducing the salinity in August. As a result, the environmental differences between 2016 and previous years (2012-2015) were investigated. In particular, the water temperatures (c.a.,30°C) and the salinity (c.a., 30) in August were outside the optimum ranges for C. polykrikoides growth in the study area. Moreover, the averages of these factors were significantly different from previous years (p<0.001). Increased stratification and diatom dominance, both negatively associated with C. polykrikoides growth, were consistently observed during the study period. In the Goheung area, which is the western part of the southern Korean coastal waters (KCW), C. polykrikoides bloomswere observed, but they did not expand to the entire southern KCW, unlike in previous years. At that time, the strong winds from the Malakas typhoon may have terminated the bloom. In addition, westward winds may have inhibited the spread oflogical data were collected along the Tongyeong coast through a biweekly field survey from June to September. In 2016, the amount of Changjiang River discharge from China, which can affect coastal environments via ocean currents, was relatively larger than in the past four years, reducing the salinity in August. As a result, the environmental differences between 2016 and previous years (2012-2015) were investigated. In particular, the water temperatures (c.a.,30°C) and the salinity (c.a., 30) in August were outside the optimum ranges for C. polykrikoides growth in the study area. Moreover, the averages of these factors were significantly different from previous years (p<0.001). Increased stratification and diatom dominance, both negatively associated with C. polykrikoides growth, were consistently observed during the study period. In the Goheung area, which is the western part of the southern Korean coastal waters (KCW), C. polykrikoides bloomswere observed, but they did not expand to the entire southern KCW, unlike in previous years. At that time, the strong winds from the Malakas typhoon may have terminated the bloom. In addition, westward winds may have inhibited the spread of
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/23414
Bibliographic Citation
제2회 응용생태공학회 한국환경생물학회 공동학술대회, pp.23, 2018
Publisher
환경생물학회
Type
Conference
Language
Korean
Publisher
환경생물학회
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