Trophic Structure of Fishery Organism Assemblage in the Offshore Sea of Yangjiang in Spring
DANG Yingchao1,2, LI Sha1,2, ZHAO Zhigang1,3, FENG Lingling1,3, LI Bo1,2, JIANG Wei1,2
1. China Three Gorges Corporation, Wuhan 430000, China; 2. National Engineering Center of Eco-Environments in the Yangtze River Economic Belt, Wuhan 430014, China; 3. Three Gorges New Energy Yangjiang Power Co., Ltd., Yangjiang 529500, China
Abstract：In order to understand the trophic structure characteristics of the main fishery organisms in the offshore sea of Yangjiang, the trophic structure of the main fishery organisms was analyzed using the stable isotope technology of carbon (C) and nitrogen (N) by a trawling fishery survey in spring of 2024. The results showed that the δ13C and δ15N values of the fishery organisms were ranged from -20.31‰ to -15.36‰ and from 9.48 ‰ to 14.81 ‰, respectively, with average values of -(17.69±1.21)‰ and (12.79±1.18)‰. There was significant stratification in trophic structure of the fishery organism assemblage in this area, with trophic level from 2.31 to 3.87 (average 3.35), higher than that of crustaceans (average 2.81) and cephalopods (average 3.23), the widest trophic level range in fish, and relatively complex feeding habits. There was to some extent trophic ecological niche overlap among the three groups, with higher core trophic ecological niche in fish than that in crustaceans and cephalopods, and the relatively high spatial overlap of the core trophic ecological niche of fish with that of cephalopods, indicating a significant competitive relationship between fish and cephalopods. The δ13C-δ15N ratio analysis indicated that Konosirus punctatus, Leiognathus brevirostris, Trachurus japonicus, Nuchequula nuchalis and Charybdis feriata were of the key species occupying the vertices of the convex polygon. The trophic level range of marine fishery organisms was only 1.57 in this area based on the typical enrichment coefficient of 3.4‰ between trophic levels, with relatively low (3.87) in the food chain, indicating that it was currently in a state where the food web structure was simple and significantly disturbed. Meanwhile, the comparison results with the Fishbase database showed that the trophic levels of approximately 50% of the fish species remained stable, but there were still 19% of species with an increase and 31% with a decrease, indicating that there were phenomena of high fishing intensity and habitat degradation in the coastal waters of Yangjiang. In thepresent research, a continuous trophic level diagram for marine fishery organisms was preliminarily establish in the Yangjiang area using stable isotope technology, revealing the ecological functions of key species and providing theoretical basis for the scientific management and rational utilization of fishery resources.
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2026, Vol. 45 
