Chain response of microbial loop to the decay of a diatom bloom in the East China Sea

doi:10.1016/j.dsr2.2015.05.006

	Chain response of microbial loop to the decay of a diatom bloom in the East China Sea
	Wu, Linnan 1,2; Lin, Shiquan 1; Huang, Lingfeng 2; Lu, Jiachang 1,2; Chen, Wenzhao 1; Guo, Weidong 1; Zhang, Wuchang 3; Xiao, Tian 3; Sun, Jun 4
	2016-02-01
发表期刊	DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
卷号	124 页码:109-116
文章类型	Article
摘要	Algal bloom has been regarded as one of the key causes for the summer hypoxia phenomena in the bottom water adjacent to the Yangtze River estuary in the East China Sea. Although a series of biological processes within microbial loop are involved in the development of oxygen depletion during the bloom decay, little has been known about the dynamics of microorganisms in response to the decaying process of the bloom through trophic interaction context. Here, we report some preliminary results of our observations about the response of microbial loop to the bloom decay, based on the onboard incubation experiments for 10 days during a diatom bloom near the Yangtze River estuary in August, 2011. Light and dark incubations were conducted to simulate the bloom decay inside and below the euphotic layer, respectively. In the first stage of bloom decay (Day 0 to Day 4), rapid response was found in heterotrophic bacteria (HB) and ciliate growth, which was in accordance with the decrease of total ChI a, indicating a "bottom-up" control at the early stage of bloom decay. However, the increase of heterotrophic nanoflagellates (HNF) abundance was rather inconspicuous, suggesting predation pressure on HNF from ciliate or other predator at this stage. In the second stage (Day 4 to Day 8), HB and ciliate decreased rapidly with the increase of HNF, revealing the release of HNF form ciliate predation, which suggested a "top-down" control. In the last stage of our experiment (Day 8 to Day 10), the trophic interactions were more complex, but it also implied a "top-down" control within the microbial loop. Meanwhile, virus had been monitored in the whole process of our incubations. It was found that virus lysed microalgae at the first stage, and lysed HB at the second stage. In addition, the bacterial mortality was principally caused by HNF grazing in the light-sufficient incubations and by viral lysis in the light insufficient incubations. Our results suggest tight trophic interactions within the microbial loop in the decaying process of the algal bloom, which may assist our understanding of the role of microbial loop in hypoxia formation in coastal waters. (C) 2015 Elsevier Ltd. All rights reserved.
关键词	Chain Response Microbial Loop Bloom Decay Trophic Interaction
DOI	10.1016/j.dsr2.2015.05.006
收录类别	SCI
语种	英语
WOS记录号	WOS:000370908400012
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/337002/112480
专题	海洋生态与环境科学重点实验室
作者单位	1.Xiamen Univ, Coll Ocean & Earth Sci, Xiamen, Peoples R China 2.Xiamen Univ, Minist Educ Coastal & Wetland Ecosyst, Key Lab, Xiamen, Peoples R China 3.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Ecol & Environm Sci, Qingdao, Peoples R China 4.Tianjin Univ Sci & Technol, Coll Marine Sci & Engn, Tianjin, Peoples R China
推荐引用方式 GB/T 7714	Wu, Linnan,Lin, Shiquan,Huang, Lingfeng,et al. Chain response of microbial loop to the decay of a diatom bloom in the East China Sea[J]. DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY,2016,124:109-116.
APA	Wu, Linnan.,Lin, Shiquan.,Huang, Lingfeng.,Lu, Jiachang.,Chen, Wenzhao.,...&Sun, Jun.(2016).Chain response of microbial loop to the decay of a diatom bloom in the East China Sea.DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY,124,109-116.
MLA	Wu, Linnan,et al."Chain response of microbial loop to the decay of a diatom bloom in the East China Sea".DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY 124(2016):109-116.

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