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	Potential influence of water level changes on energy flows in a lake food web
	Xu J.
	2011
关键词	stable isotopes seasonal food sources IsoSource model water level Poyang Lake nitrogen isotope ratios stable-isotope fresh-water seasonal-variations terrestrial carbon organic-matter fish community climate-change yangtze plants
英文摘要	Large seasonal water-level fluctuations may influence isotopic signatures of primary producers and the types and amounts of these potential food sources accessible to aquatic fauna of Poyang Lake, the largest freshwater lake in China. In this study, the isotopic signatures of primary producers and consumers were determined, stable carbon and nitrogen isotope analysis and mixing models were combined to investigate the influence of water levels on the diet and isotopic composition of Poyang Lake fish and invertebrates. Five potential food sources (seston, benthic organic matter, aquatic macrophytes, attached algae, and terrestrial plants), 4 species of invertebrates, and 10 species of fish were collected from the lake area during dry and wet seasons between January 2009 and April 2010. The delta (13)C values of invertebrates and most fish were within the range of delta (13)C values of the potential food sources for both seasons. The delta (13)C values of invertebrates and most fish were lower in the dry season than in the wet season, whereas the delta (15)N values exhibited different patterns for different species. Mixing models indicated that the most important food sources for common lake fauna were seston in the dry season and aquatic macrophytes and terrestrial plants in the wet season. The fauna were more omnivorous in the wet season than in the dry season. The food web dynamics of Poyang Lake are strongly influenced by changes in the abundance and accessibility of different basal food sources that occur because of seasonal flood pulses. The trophic links within the aquatic communities of Poyang Lake are modified by water-level fluctuations.
出处	Chinese Science Bulletin
卷	56
期	26
页	2794-2802
收录类别	SCI
语种	英语
ISSN号	1001-6538
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/22830]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Xu J.. Potential influence of water level changes on energy flows in a lake food web. 2011.

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