Combined effects of toxic Karenia mikimotoi and hypoxia on the juvenile abalone Haliotis discus hannai

doi:10.3389/fmars.2023.1029512

	Combined effects of toxic Karenia mikimotoi and hypoxia on the juvenile abalone Haliotis discus hannai
	Zhang, Yue 1,2; Song, Xiuxian1,2,3,4 ; Zhang, Peipei2
	2023-06-12
发表期刊	FRONTIERS IN MARINE SCIENCE
卷号	10 页码:11
通讯作者	Song, Xiuxian(songxx@qdio.ac.cn)
摘要	Eutrophication in aquaculture areas concurrently leads to a high incidence of dissolved oxygen deficiency and toxic algal blooms. The combined effects of hypoxia and typical toxic algae on cultured organisms should be given sufficient consideration. Abalone breeding in China has greatly suffered from hypoxia and toxic Karenia mikimotoi blooms for many years. In this study, the individual and combined effects of the toxic dinoflagellate, K. mikimotoi, and hypoxia on juvenile abalone were determined based on abalone survival and oxidative stress indicators in their gills, hepatopancreas and hemolymph. The results showed that at a density of 10(6) to 3x10(7) cells/L, K. mikimotoi alone had a negligible influence on the survival of juvenile abalone under sufficient dissolved oxygen (DO) conditions. The 24 h-half lethal concentration (LC50) of DO alone for juvenile abalone was 0.75 mg/L in seawater. When K. mikimotoi was added at a density of 3x10(6) cells/L, the 24 h-LC50 of DO for juvenile abalone significantly increased to 2.59 mg/L, indicating obvious synergistic effects. The individual effects of hypoxia or K. mikimotoi on the oxidative stress indicators were limited, and only the superoxide dismutase (SOD) activity in the abalone gills significantly decreased under K. mikimotoi stress. However, the combined stress of hypoxia and K. mikimotoi led to significant changes in the antioxidant indicators in all tested tissues. The SOD activity in gills and hepatopancreas decreased, while the SOD and catalase (CAT) activity and malondialdehyde (MDA) content in the hemolymph increased due to the combined stress of hypoxia and K. mikimotoi. These results illustrated that the synergistic effects of hypoxia and K. mikimotoi caused serious oxidative damage in abalone and that the hemolymph exhibited greater sensitivity than did the gills and hepatopancreas. Further investigation found that K. mikimotoi increased the oxygen consumption rate in abalone and that hypoxia enhanced the hemolytic toxicity of K. mikimotoi. These results revealed that hypoxia and typical toxic algae cause synergistic harm to cultured organisms, which is expected to provide a new understanding of the destructive mechanisms of typical toxic algal blooms in aquacultural areas.
关键词	hypoxia Karenia mikimotoi Haliotis discus hannai oxidative stress synergistic effects
DOI	10.3389/fmars.2023.1029512
收录类别	SCI
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology
WOS类目	Environmental Sciences ; Marine & Freshwater Biology
WOS记录号	WOS:001012957900001
出版者	FRONTIERS MEDIA SA
WOS关键词	CYANOBACTERIA MICROCYSTIS-AERUGINOSA ; OXYGEN ; RESPONSES ; CADMIUM ; DECLINE ; BLOOMS ; OCEAN
引用统计	被引频次：1[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.qdio.ac.cn/handle/337002/182386
专题	海洋生态与环境科学重点实验室
通讯作者	Song, Xiuxian
作者单位	1.Laoshan Lab, Qingdao, Peoples R China 2.Chinese Acad Sci, Inst Oceanol, CAS Key Lab Marine Ecol & Environm Sci, Qingdao, Peoples R China 3.Univ Chinese Acad Sci, Beijing, Peoples R China 4.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China
第一作者单位	中国科学院海洋研究所
通讯作者单位	中国科学院海洋研究所
推荐引用方式 GB/T 7714	Zhang, Yue,Song, Xiuxian,Zhang, Peipei. Combined effects of toxic Karenia mikimotoi and hypoxia on the juvenile abalone Haliotis discus hannai[J]. FRONTIERS IN MARINE SCIENCE,2023,10:11.
APA	Zhang, Yue,Song, Xiuxian,&Zhang, Peipei.(2023).Combined effects of toxic Karenia mikimotoi and hypoxia on the juvenile abalone Haliotis discus hannai.FRONTIERS IN MARINE SCIENCE,10,11.
MLA	Zhang, Yue,et al."Combined effects of toxic Karenia mikimotoi and hypoxia on the juvenile abalone Haliotis discus hannai".FRONTIERS IN MARINE SCIENCE 10(2023):11.