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	Spectral Characteristics of Dissolved Organic Matter Released during the Metabolic Process of Small Medusa
	Guo Dong-hui ; Guo DH(郭东晖) ; Yi Yue-yuan ; Zhao Lei ; Guo Wei-dong ; Guo WD(郭卫东)
	2012-06
关键词	Dissolved organic matter Medusa Metabolic process Fluorescence excitation-emission matrix spectroscopy Parallel factor analysis (PARAFAC) Zooplankton index (ZIX)
英文摘要	The metabolic processes of jellyfish can produce dissolved organic matter (DOM) which will influence the functioning of the aquatic ecosystems, yet the optical properties of DOM released by jellyfish are unknown. Here we report the absorption and fluorescence properties of DOM released by a medusa species Black fordia virginica during a 24 h incubation experiment. Compared with the control group, an obvious increase in the concentrations of dissolved organic carbon (DOC), absorption coefficient (a(280)) and total dissolved nitrogen (TDN) was observed in incubation group. This clearly demonstrated the release of DOM, chromophoric DOM (CDOM) and dissolved nutrients by B. virginica which feed on enough of Anemia sp. before the experiment. The increase in spectral slope ratio (SR) and decrease in humification index (HIX) indicated that the released D()M was less-humified and had relatively lower molecular weight. Parallel factor analysis (PARAFAC) decomposed the fluorescence matrices of DOM into three humic-like components (C1-C3) and one protein-like component (C4). The F-max of two components (C2: <250, 295/386 nm; C4: 275/334 nm) with the emission wavelength <400 nm increased significantly during the metabolic process of B. virginica. However, the F-max of the other two components with the emission wavelength >400 nm showed little changes. Thus, we suggested a zooplankton index (ZIX) to trace and characterize the DOM excreted by metabolic activity of zooplankton, which is calculated as the ratio of the sum of F-max of all fluorescence components with the emission wavelength <400 nm to the sum of F-max of the other components with the emission wavelength >400 nm.
语种	英语
出版者	OFFICE SPECTROSCOPY & SPECTRAL ANALYSIS
内容类型	期刊论文
源URL	[http://dx.doi.org/10.3964/j.issn.1000-0593(2012)06-1584-04]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Guo Dong-hui,Guo DH,Yi Yue-yuan,et al. Spectral Characteristics of Dissolved Organic Matter Released during the Metabolic Process of Small Medusa[J],2012.
APA	Guo Dong-hui,郭东晖,Yi Yue-yuan,Zhao Lei,Guo Wei-dong,&郭卫东.(2012).Spectral Characteristics of Dissolved Organic Matter Released during the Metabolic Process of Small Medusa..
MLA	Guo Dong-hui,et al."Spectral Characteristics of Dissolved Organic Matter Released during the Metabolic Process of Small Medusa".(2012).

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