Trophic interactions within the microbial food web in the South China Sea revealed by size-fractionation method

doi:10.1016/j.jembe.2008.10.012

	Trophic interactions within the microbial food web in the South China Sea revealed by size-fractionation method
	Chen, Binghang 2; Liu, Hongbin 1,2; Wang, Zongling 3
刊名	JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY
	2009-01-15
卷号	368 期号:1 页码:59-66
关键词	Grazing Microbial food web Picoplankton Size-fractionation
ISSN号	0022-0981
DOI	10.1016/j.jembe.2008.10.012
英文摘要	To define nanoflagellate-bacteria interactions and potential trophic levels within the microbial food web in the oligotrophic South China Sea, we conducted fourteen size-fractionation experiments in which seawater was filtered through 1, 2, 5, 10, 20, 60, and 200 mu m membranes or meshes and the growth of four groups of picoplankton, Prochlorococcus, Synechococcus, high DNA heterotrophic bacteria, and low DNA heterotrophic bacteria were monitored in each filtrate after 24 hours of incubation. Removing grazers by filtration would relieve the grazing pressure on lower trophic levels which finally influenced the net growth rates of picoplankton. The growth patterns of Prochlorococcus and Synechococcus were similar, with higher growth rates in the < 1 mu m or < 2 mu m treatments, a second peak in the < 10 mu m treatments and often a third peak in the <200 mu m treatments. The net growth rates of low DNA heterotrophic bacteria were little influenced by size-fractionation. Due to a subgroup of high DNA heterotrophic bacteria with larger size and higher DNA content which appeared to resist the grazing by <5 mu m nanoflagellates, the net growth rates of high DNA heterotrophic bacteria were higher in the <2 mu m or <5 mu m treatments with a second peak in the <60 mu m treatments. A general pattern of five potential trophic levels (<2 mu m, 2-5 mu m, 5-10 mu m, 10-60 mu m, 60-200 mu m) was revealed combining all the experiments, confirming the existence Of multiple trophic levels within the microbial food web in the oligotrophic South China Sea. (C) 2008 Elsevier B.V. All rights reserved.
资助项目	Hong Kong RGC research[HKUST6414/06M]
WOS关键词	SUBTROPICAL NORTH PACIFIC ; FLOW-CYTOMETRY ; BACTERIA ; PICOPLANKTON ; PHYTOPLANKTON ; OCEAN ; PREY ; BACTERIOPLANKTON ; PRODUCTIVITY ; VARIABILITY
WOS研究方向	Environmental Sciences & Ecology ; Marine & Freshwater Biology
语种	英语
出版者	ELSEVIER SCIENCE BV
WOS记录号	WOS:000262058500007
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/25878]
专题	自然资源部第一海洋研究所
通讯作者	Liu, Hongbin
作者单位	1.Hong Kong Univ Sci & Technol, Dept Biol, Hong Kong, Hong Kong, Peoples R China 2.Hong Kong Univ Sci & Technol, Atmospher Marine & Coastal Environm Program, Hong Kong, Hong Kong, Peoples R China 3.State Ocean Adm, Inst Oceanog 1, Qingdao 266061, Shandong, Peoples R China
推荐引用方式 GB/T 7714	Chen, Binghang,Liu, Hongbin,Wang, Zongling. Trophic interactions within the microbial food web in the South China Sea revealed by size-fractionation method[J]. JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY,2009,368(1):59-66.
APA	Chen, Binghang,Liu, Hongbin,&Wang, Zongling.(2009).Trophic interactions within the microbial food web in the South China Sea revealed by size-fractionation method.JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY,368(1),59-66.
MLA	Chen, Binghang,et al."Trophic interactions within the microbial food web in the South China Sea revealed by size-fractionation method".JOURNAL OF EXPERIMENTAL MARINE BIOLOGY AND ECOLOGY 368.1(2009):59-66.