Succession phenomenon of Cochlodinium polykrikoides and Alexandrium affine related with changes of coastal environments in the southern sea of Korea in summer

Title
Succession phenomenon of Cochlodinium polykrikoides and Alexandrium affine related with changes of coastal environments in the southern sea of Korea in summer
Author(s)
임영균; 백승호; 김진호; 이민지; 김영옥; 신현호
KIOST Author(s)
Lim, Young kyun(임영균)Baek, Seung Ho(백승호)Lee, Minji(이민지)Kim, Young Ok(김영옥)Shin, Hyeon Ho(신현호)
Publication Year
2018-10-29
Abstract
Among the harmful algal blooms (HABs) species, the dinoflagellate Cochlodinium, and Alexandrium species have been studied widely, due to their serious damages to the aquaculture industry. The present study investigated the appearance and succession patterns of HABs in the Korean coasts, and performed the bioassay using Cochlodinium polykrikoides and Alexandrium affine cultures to evaluate their competitive relationship and explain the succession phenomenon of HABs. From Juneto August, surface water temperature increased from 20.3°C to 26.8°C and the salinity decrease from 33.9 to 31.8 psu, and the stratification developed strongly. In this time, nutrient concentrations were kept low in surface layer, then dinoflagellate HABs species, C. polykrikoides, dominated in zone I, but A. affine dominated both zone I and II in middle August. In growth experiments, C. polykrikoides did not grow at 20 psu of 25 °C and 27°C, and it was dead within 2 daysin all cultivation of 30°C. The maximum growth rate (μmax) of C. polykrikoides was 0.31 d-1 at 25°C of 32 psu. A. affine showed negative growth rates at 15°C, but it grew well in all salinity at 20 °C to 30 °C. The maximum growth rate (μmax) of A. affine was 0.43 d-1 at 25 °C of 30 psu. In co-cultivation, A. affine had a competitive advantage at all temperatures, which of 1: 1 ratio of initial cell density of both species. In co-cultivations of gradient initial cellccession patterns of HABs in the Korean coasts, and performed the bioassay using Cochlodinium polykrikoides and Alexandrium affine cultures to evaluate their competitive relationship and explain the succession phenomenon of HABs. From Juneto August, surface water temperature increased from 20.3°C to 26.8°C and the salinity decrease from 33.9 to 31.8 psu, and the stratification developed strongly. In this time, nutrient concentrations were kept low in surface layer, then dinoflagellate HABs species, C. polykrikoides, dominated in zone I, but A. affine dominated both zone I and II in middle August. In growth experiments, C. polykrikoides did not grow at 20 psu of 25 °C and 27°C, and it was dead within 2 daysin all cultivation of 30°C. The maximum growth rate (μmax) of C. polykrikoides was 0.31 d-1 at 25°C of 32 psu. A. affine showed negative growth rates at 15°C, but it grew well in all salinity at 20 °C to 30 °C. The maximum growth rate (μmax) of A. affine was 0.43 d-1 at 25 °C of 30 psu. In co-cultivation, A. affine had a competitive advantage at all temperatures, which of 1: 1 ratio of initial cell density of both species. In co-cultivations of gradient initial cell
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/22943
Bibliographic Citation
PICES, pp.190, 2018
Publisher
PICES
Type
Conference
Language
English
Publisher
PICES
Related Researcher
Research Interests

Marine ecology,Plankton,Protists,해양생태,부유생물,원생생물

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