Modeling Trophic Structure and Energy Flows in a Coastal Artificial Ecosystem Using Mass-Balance Ecopath Model

文献类型： 外文期刊

第一作者： Xu, Shannan

作者： Xu, Shannan;Li, Shiyu;Chen, Zuozhi;He, Peimin

作者机构：

关键词： Artificial ecosystem;Detrital flows;Ecopath model;Energy transfer;Trophic level;Trophic structure

期刊名称：ESTUARIES AND COASTS （ 影响因子：2.976； 五年影响因子：3.186 ）

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年卷期：

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收录情况： SCI

摘要： Using a large-scale enclosed sea area in northern Hangzhou Bay as a case study, the trophic interactions, energy flows, and ecosystem properties of a coastal artificial ecosystem were analyzed by ecotrophic modeling using Ecopath with Ecosim software (EwE, 5.1 version). The model consists of 13 functional groups: piscivorous fish, benthic-feeding fish, zooplanktivorous fish, herbivorous fish, crabs, shrimp, mollusca, infauna, carnivorous zooplankton, herbivorous zooplankton, macrophytes, phytoplankton, and detritus. Input information for the model was gathered from published and unpublished reports and from our own estimates during the period 2006-2007. Results show that the food web in the enclosed sea area was dominated by a detritus pathway. The trophic levels of the groups varied from 1.00 for primary producers and detritus to 3.90 for piscivorous fish in the coastal artificial system. Using networkanalysis, the system network was mapped into a linear food chain, and five discrete trophic levels were found with a mean transfer efficiency of 9.8% from detritus and 9.4% from primary producer within the ecosystem. The geometric mean of the trophic transfer efficiencies was 9.6%. Detritus contributed 57% of the total energy flux, and the other 43% came from primary producers. The ecosystem maturity indices-total primary production/total respiration, Finn's cycling index, and ascendancy-were 2.56, 25.0%, and 31.0%, respectively, showing that the coastal artificial system is at developmental stage according to Odum's theory of ecosystem development. Generally, this is the first trophic model of a large-scale artificial sea enclosure in China and provides some useful insights into the structure and functioning of the system.

分类号： Q17

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