Effect of marine heatwaves on bloom formation of the harmful dinoflagellate Cochlodinium polykrikoides: Two sides of the same coin? SCIE SCOPUS

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Title
Effect of marine heatwaves on bloom formation of the harmful dinoflagellate Cochlodinium polykrikoides: Two sides of the same coin?
Author(s)
Lim, Young kyun; Park, Bum Soo; Kim, Jin Ho; Baek, S.-S.; Baek, Seung Ho
KIOST Author(s)
Lim, Young kyun(임영균)Park, Bum Soo(박범수)Baek, Seung Ho(백승호)
Alternative Author(s)
임영균; 박범수; 백승호
Publication Year
2021-04
Abstract
In 2018, the bloom of harmful dinoflagellate Cochlodinium polykrikoides occurred under abnormally high water temperature (WT) conditions caused by heatwaves in Korean coastal water (KCW). To better understand C. polykrikoides bloom at high WTs in 2018, we conducted field survey and laboratory experiments (the physiological and genetic differences between the two strains, CP2013 and CP2018). The heatwave increased the WT from 24.1 degrees C to 29.2 degrees C for two weeks, leading to strong stratification even in mid July (p < 0.01, Chi square = 94.656, Kruskal-Wallis test). Under early stratification conditions, patch blooms formed more earlier than the average outbreak in the last 17 years in KCW, despite high WT reaching 30 degrees C. In laboratory experiments, although there were no genetic differences in the LSU rDNA, both strains showed a significant different growth response to high WTs; above 28 degrees C, CP2013 did not survive, but CP2018 was able to grow, suggesting that CP2018 had potential growth capacity at high WTs. However, the growth rate and yield of the culture (CP2018) were lowered at 30 degrees C. Also, the blooms of C. polykrikoides in 2018 lasted only 3 weeks, which is unusual short compared to the average duration since 2002. The negative correlation between the average WT and duration of C. polykrikoides bloom in previous 17 years (R-2 = 0.518, p < 0.01) supports that high WT approaching 30 degrees C is not favorable for C. polykrikoides in KCW. Thus, our findings indicated that in relation to heatwaves, early stratification condition plays a critical role in developing C. polykrikoides blooms, but maintaining bloom are negatively affected under high WT conditions.
ISSN
1568-9883
URI
https://sciwatch.kiost.ac.kr/handle/2020.kiost/41323
DOI
10.1016/j.hal.2021.102029
Bibliographic Citation
HARMFUL ALGAE, v.104, 2021
Publisher
ELSEVIER
Subject
KOREAN COASTAL WATERS; SEA-SURFACE TEMPERATURE; LOWER CHESAPEAKE BAY; RED TIDE; VERTICAL MIGRATION; ALGAL BLOOMS; HEAT WAVES; MARGALEFIDINIUM-POLYKRIKOIDES; PHYLOGENETIC-RELATIONSHIPS; TEMPORARY CYSTS
Keywords
Heatwaves; High water temperature; Stratification; HABs; Cochlodinium polykrikoides; Intraspecific physiological characteristics
Type
Article
Language
English
Document Type
Article
Publisher
ELSEVIER
Related Researcher
Research Interests

Molecular Ecology,Ecological Interaction between bacteria and phytoplankton,Harmful Algal Blooms (HABs),분자생태학,생태적 상호관계(박테리아-식물플랑크톤),유해조류대발생

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