Analysis of ecosystem structure and energy flow in Xiangyun Bay marine ranching based on Ecopath model
LI Xinyu，ZHANG Yunling，QI Zunli*，SHI Baojia，ZHAO Xiaoteng
1.College of Ocean Science，Agricultural University of Hebei，Qinhuangdao 066000，China；2.Tangshan Ocean Pasture Industry Company Limited，Tangshan 063611，China；3.Hebei Coastal Ecological Restoration Technology Innovation Center，Tangshan 063611，China
Abstract: To quantitatively analyze the biocommunity structure and energy flow process in the marine ranching area, the Ecopath Model was constructed based on the 4 voyages survey of biological resources by a 99 kW fishing vessel with 3 cm mesh bottom trawl in Xiangyun Bay Marine Ranching Area,and control area in 2020. There were 21 functional groups in the marine ranching area model, and 18 functional groups in the control area. The model analysis showed that the trophic level range was varied from 1 to 4.04 in the marine ranching area, with Cephalopod at the top of the food chain and from 1 to 4.35 in the control area, with black rockfish (Sebastesschlegelii) at the top of the food chain. The energy flow between communities was mainly concentrated at the lower trophic level, and the energy transfer efficiency was decreased gradually along the food chain. The proportion of the energy flux was found to be 58.09%, 38.73% and 2.82% at trophic level 1, 2 and 3 in the total energy flux in the marine ranching area, respectively, and 72.93%, 24.25% and 2.41% in the control area was. The proportion of energy in the total energy source of the system was 37.7% from detritus functional group and 62.3% from primary producer functional group in the marine ranching area, and 39.6% from detritus functional group and 60.4% from primary producer functional group in the control area. The energy circulation channel of the marine ranching community was more dominated by grazing food chain. The system connectivity index (CI) was 0.34 and system omnivore index (SOI) 0.24 in the demonstration area, 0.30 and 0.21 in the control area, respectively, with Shannon Weiner diversity index (SDI) of 1.86 in the demonstration area and of 1.47 in the control area. The analysis of the output parameters of the model revealed that the establishment of marine ranching area made the marine biological community structure gradually a stable trend.
李欣宇, 张云岭, 齐遵利, 石保佳, 赵小腾. 基于Ecopath模型的祥云湾海洋牧场生态系统结构和能量流动分析[J]. 大连海洋大学学报, 2023, 38(2): 311-322.
LI Xinyu, ZHANG Yunling, QI Zunli, SHI Baojia, ZHAO Xiaoteng. Analysis of ecosystem structure and energy flow in Xiangyun Bay marine ranching based on Ecopath model. Journal of Dalian Ocean University, 2023, 38(2): 311-322.
2023, Vol. 38 
