Quantitative model of trophic interactions in Beibu Gulf ecosystem in the northern South China Sea

文献类型： 外文期刊

第一作者： Chen Zuozhi

作者： Chen Zuozhi;Qiu Yongsong;Jia Xiaoping

作者机构：

关键词： trophic dynamics modeling;energy flow;network analysis;beibu gulf ecosystem

期刊名称：ACTA OCEANOLOGICA SINICA （ 影响因子：1.431； 五年影响因子：1.445 ）

ISSN：

年卷期：

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收录情况： SCI

摘要： A mass-balanced model was constructed to determine the flow-energy in a community of fishes and invertebrates in the Beibu Gulf, northern South China Sea using Ecopath and Ecosim software. Input parameters were taken from the literature, except for the bio-mass of fish groups which was obtained from trawl surveys during October 1997 to May 1999 in the study area. The model consisted of 16 functional groups (boxes) , including one marine mammal and seabirds, each representing organisms with a similar role in the food web, and only covered the main trophic flow in the Beibu Gulf ecosystem. The results showed that the food web of Beibu Gulf was dominated by the detrital path and benthic invertebrates played a significant role in transferring energy from the detritus to higher trophic levels; phytoplankton was a primary producer and most utilized as a food source. Fractional trophic levels ranged from 1.0 to 4. 08 with marine mammals occupying the highest trophic level. Using network analysis, the system network was mapped into a linear food chain and six discrete trophic levels were found with a mean transfer efficiency of 16. 7% from the detritus, 16. 2% from the primary producer within the ecosystem. The biomass density of the commercially utilized species estimated by the model is 8. 46 t/km~2, only 0. 48% of the net primary production.

分类号： P7

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