基于Ecopath模型的烟威渔场海域三疣梭子蟹增殖生态容量评估研究OA北大核心

To scientifically guide stock enhancement strategies,this study aimed to evaluate the ecological carrying capacity of Portunus trituberculatus in the Yan-Wei fishing ground.During the spring,summer,autumn,and winter of 2022-2023,an Ecopath model incorporating 23 functional groups was developed using seasonally collected ma-rine biological and environmental datasets.This model was used to characterize the energy flow and food web structure in this ecosystem and evaluate the ecological carrying capacity for the stock enhancement of P.trituber-culatus.The trophic levels of functional groups ranged from 1.00 to 4.16,with ecological efficiency(EE)values ranging from 0.21 to 0.92.The trophic level of P.trituberculatus was 3.44,with an EE value of 0.42.The total en-ergy transfer efficiency of the ecosystem was 6.80％.For primary producers and detritus,the energy transfer effi-ciencies were the lowest at trophic levels Ⅱ and Ⅲ(3.79％and 4.45％,respectively)and the highest at levels Ⅳ and V(10.62％and 12.21％,respectively).The food web was structured by grazing and detritus food chains,with the grazing food chain accounting for 56.0％of the energy flow.The connectance index and system omnivory index values were 0.34 and 0.18,respectively.The ecological carrying capacity of P.trituberculatus was reached when its biomass increased to 0.482 4 t·km-2(9.1 times the current biomass),at which point the EE of another shrimp func-tional group reached a threshold value of 1.These findings provide a theoretical basis for optimizing stock en-hancement strategies for P.trituberculatus in the Yan-Wei fishing ground and offer technical support for the sus-tainable development and management of fishery resources.