Comparing trophic structure of a subtropical bay as estimated from mass-balance food web model and stable isotope analysis
作者： Jianguo Du , William W.L. Cheung , Xinqing Zheng , Bin Chen , Jianji Liao
DOI: 10.1016/J.ECOLMODEL.2015.05.027
关键词:
摘要: The trophic structure of a subtropical bay in Taiwan Strait was analyzed by using two methods: mass balance modeling (Ecopath) and stable isotopic analysis (SIA). Trophic levels (TLs) main functional groups estimated from the methods were compared. Ecopath model built based on fishery resource survey Xiamen Bay 2009. Specifically, data species composition, biomass, mortality rates, diet composition fisheries catches obtained around bay. consisted 26 groups, including plankton, benthos, fish, cephalopods, shrimps, crabs marine mammals. TLs to be between 2.89 (cephalopods) 3.94 (congers), with an average 3.11. transfer efficiencies II V 12.8%, 19.2%, 19.7% 12.1%, respectively. Catfish (Tachysurus sinensis Netuma thalassina) have major impacts most ecosystem. Total system throughput 411 t km−2year−1. derived highly correlated those (Linear regression: R2 = 0.696, n = 23, p < 0.001). On average, underestimated about 12.2% compared SIA, being slightly higher at low lower high TLs. This studies support value both isotopes analyze this food web.
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