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Effects of modified clay used for the control of harmful algal blooms on Alexandrium pacificum cysts
Zhang, Yue1,2; Yu, Zhiming1,2; Song, Xiuxian1,2; Yuan, Yongquan2; Cao, Xihua2
2018-02-01
Source PublicationHARMFUL ALGAE
ISSN1568-9883
Volume72Pages:36-45
SubtypeArticle
AbstractCyst formation plays an important role in the resistance of dinofiagellates to adverse environments, and cyst germination is considered one of the causes of harmful algal blooms (HABs). Among the methods for mitigating HABs, modified clay (MC) is considered a promising strategy because of its high efficiency and low environmental impacts. The typical HAB species Alexandrium pacificum was focused on in this study to clarify the effects of MC on cyst formation and germination. The results showed that more than 90% of the vegetative cells were removed under the 0.6 g/L. MC treatment. The vegetative cell density was monitored over 90 d and increased slightly to the peak at 10 d after the cell removal experiment, but persistent growth was not observed. The amount of cysts was maximal at 20 d after removal, however, most of the cysts were temporary cysts that subsequently disappeared. After 80 d, all the remaining cysts were resting ones. The total density of resting cysts was higher under MC concentrations of 0.2 and 0.4 g/L and lower under concentrations of 0.6, 0.8 and 1.0 g/L compared with that in the control. The total formation rate of resting cysts was 29.6% in the control group, and the lowest formation rate in the experimental groups was 15.5% at 0.6 g/L. MC. The total germination rate of resting cyst decreased as the MC concentration increased, and approximately 68.0% of the resting cysts in the control group germinated successfully, whereas the addition of MC reduced the germination rate to as low as 12.4%. Our results indicated that the application of appropriate MC concentrations may provide an effective mitigation strategy for A. pacificum blooms because it does not leave more residual cysts, which can act as "seeds" for the initiation of HABs. (C) 2017 Elsevier B.V. All rights reserved.
KeywordModified clay Alexandrium pacificum Cyst Encystment Germination
Subject AreaMarine & Freshwater Biology
DOI10.1016/j.hal.2017.12.001
Indexed BySCIE
Language英语
WOS Research AreaMarine & Freshwater Biology
WOS IDWOS:000427809800004
PublisherELSEVIER SCIENCE BV
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Document Type期刊论文
Identifierhttp://ir.qdio.ac.cn/handle/337002/157604
Collection海洋生态与环境科学重点实验室
Affiliation1.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Ecol & Environm Sci, Qingdao 266071, Peoples R China
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Ecol & Environm Sci, Qingdao 266237, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
First Author AffilicationKey Laboratory of Marine Ecology & Environmental Sciences, CAS
Recommended Citation
GB/T 7714
Zhang, Yue,Yu, Zhiming,Song, Xiuxian,et al. Effects of modified clay used for the control of harmful algal blooms on Alexandrium pacificum cysts[J]. HARMFUL ALGAE,2018,72:36-45.
APA Zhang, Yue,Yu, Zhiming,Song, Xiuxian,Yuan, Yongquan,&Cao, Xihua.(2018).Effects of modified clay used for the control of harmful algal blooms on Alexandrium pacificum cysts.HARMFUL ALGAE,72,36-45.
MLA Zhang, Yue,et al."Effects of modified clay used for the control of harmful algal blooms on Alexandrium pacificum cysts".HARMFUL ALGAE 72(2018):36-45.
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