Mass-balance ecosystem model of the East China Sea

文献类型： 外文期刊

第一作者： Cheng, Jiahua

作者： Cheng, Jiahua;Cheung, William W. L.;Pitcher, Tony J.

作者机构：

关键词： Ecopath;East China Sea;Mass-balance;Fishery;Ecosystem

期刊名称：PROGRESS IN NATURAL SCIENCE （ 影响因子：3.607； 五年影响因子：4.795 ）

ISSN： 1002-0071

年卷期： 2009 年 19 卷 10 期

页码：

收录情况： SCI

摘要： Using the Ecopath mass-balance trophodynamic model, this paper analyzed the trophic levels, flows, food web structure and ecosystem maturity of the East China Sea, and identified ecologically important functional groups in the ecosystem. The model is based on fishery resource surveys of the East China Sea in 2000, studies on diet composition and global databases such as FishBase and the Sea Around Us Project Database. The results showed that trophic levels of the functional groups are between 2.86 and 4.37, with an average of 3.32. Anchocy (Engraulis japonicus), small fishes and benthic crustaceans such as shrimps and crabs are important groups in terms of the trophic structure and flow dynamics in the East China Sea. Energy flows of most groups are between specific trophic levels, except file fish (Thamnaconus spp.), pomfret (Pampus spp.) and cephalopods. Trophic transfer efficiency of levels II, III, IV and more than V are 11.8%, 21.1%, 17.4% and 22.1-22.5%, respectively. Effects of fishery - the largest 'consumer' of the ecosystem are much stronger than those exerted by biological groups in the system. The model suggests that the current fishery can further reduce the complexity of the ecosystem. Evaluations of the system indices suggest that maturity of the ecosystem is low. The conclusion of this model indicates that it was the overfishing that caused the ecosystem of the East China Sea declined, which should be taken into account as a critical reference for fisheries management in the future. (C) 2009 National Natural Science Foundation of China and Chinese Academy of Sciences. Published by Elsevier Limited and Science in China Press. All rights reserved.

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