Eosystem structure and energy flow analysis of the adjacent waters around Miaodao Islands based on Ecopath model

Abstract

Basedon the survey data of fishery resources and ecological environment in the Bohai Sea and the Yellow Sea in 1998, an Ecopath model of the adjacent waters around Miaodao Islands was constructed to analyze the trophic structure, energy flow and ecosystem characters. The results showed that the model in the adjacent waters around Miaodao Islands could be divided into 18 functional groups, and the trophic levels of each functional group ranged from 1 to 4.180, of which the highest trophic level was Scomberomorusniphonius. The energy transfer efficiency of the ecosystem was 8.53%, and the flow from primary producers accounted for 53% of the total, while the flow from detritus accounts for 47%. The energy flow was mainly dominated by grazing food chain. The ratio of total primary production/total respiration was 2.47, the Connectance index was 0.438, and the Finn’s cycling index and the Finn’s mean path length were respectively 6.336% and 2.636, indicating the low stability and maturity of the ecosystem.