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An ecological model of the artificial ecosystem (northern Hangzhou Bay, China): analysis of ecosystem structure and fishing impacts

文献类型： 外文期刊

作者： Chen, Zuozhi 1 ; Xu, Shannan 1 ; He, Peimin 2 ;

作者机构： 1.Chinese Acad Fishery Sci, Key Lab Mariculture Ecol & Qual Control, Minist Agr, S China Sea Fisheries Res Inst, Guangzhou 510300, Guangdong, Peoples R China

2.Shanghai Ocean Univ, Coll Fisheries & Life Sci, Shanghai 201306, Peoples R China

关键词： Ecopath with Ecosim;Trophic structure;Network analysis;Fishing impact;Artificial ecosystem;Detritus pathway

期刊名称：HELGOLAND MARINE RESEARCH （ 影响因子：1.241； 五年影响因子：1.809 ）

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收录情况： SCI

摘要： The artificial ecosystem is a large-scale enclosure in northern Hangzhou Bay, China. Using the Ecopath with Ecosim software, a trophic structure model is constructed for 2006-2007 to characterize the food web structure, functioning, and describing the ecosystem impacts of fishing. Input information for the model were gathered from published and unpublished reports and from our own estimates during the period 2006-2007. Pedigree work and simple sensitivity analysis were carried out to evaluate the quality and the uncertainty of the model. 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 artificial system. Using network analysis, 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, 9.4% from primary producer within the ecosystem. The geometric mean of the trophic transfer efficiencies was 9.5%. Detritus contributed 57% of the total energyflux, and the other 43% came from primary producers. The ecosystem maturity indices-TPP/TR (total primary production/total respiration), FCI (Finn cycling index), A (ascendancy) and TB/TDET were 2.672, 25%, 31.5%, and 0.013, respectively, showing that the artificial system is at developmental stage according to Odum's theory of ecosystem development. The 'Keystoneness' result indicates that herbivorous zooplankton was identified as keystone species in this system. Furthermore, a simple dynamical simulation was preformed for varying fishing mortality over 10 years. The biomass of most fish groups has a small increase when the fishing mortality at current level. Increasing fishing mortality by twofold resulted in a marked decrease in biomass of piscivorous fish accompanied by an increase in that of other fish groups, notable zooplanktivorous fish. Generally, this study represents the first attempt to evaluate the food web structure and the potential effects of fisheries in the artificial coastal ecosystem. It is concluded that this model is a potential tool for use in the management of the artificial ecosystem in northern Hangzhou Bay.

  • 相关文献

[1]Modeling Trophic Structure and Energy Flows in a Coastal Artificial Ecosystem Using Mass-Balance Ecopath Model. Xu, Shannan,Li, Shiyu,Chen, Zuozhi,He, Peimin.

[2]Quantitative model of trophic interactions in Beibu Gulf ecosystem in the northern South China Sea. Chen Zuozhi,Qiu Yongsong,Jia Xiaoping.

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