| HAN Dongyan,XUE Ying,ZHANG Chongliang,REN Yiping. 2017. A mass balanced model of trophic structure and energy flows of a semi-closed marine ecosystem. Acta Oceanologica Sinica, 36(10):60－69 |
| A mass balanced model of trophic structure and energy flows of a semi-closed marine ecosystem |
| 应用物质平衡模型模拟一个半封闭海湾的营养结构和能流特征 |
| Received:June 28, 2016 |
| DOI：10.1007/s13131-017-1071-6 |
| Key words:Ecopath with Ecosim Jiaozhou Bay energy flow trophic structure |
| 中文关键词: Ecopath with Ecosim 胶州湾 能量流动 营养结构 |
| 基金项目: |
| Author Name | Affiliation | E-mail | | HAN Dongyan | Fisheries College, Ocean University of China, Qingdao 266003, China | | | XUE Ying | Fisheries College, Ocean University of China, Qingdao 266003, China | | | ZHANG Chongliang | Fisheries College, Ocean University of China, Qingdao 266003, China | | | REN Yiping | Fisheries College, Ocean University of China, Qingdao 266003, China | renyip@ouc.edu.cn |
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| Abstract: |
| The marine ecosystem of the Jiaozhou Bay has degraded significantly in fisheries productivity and its ecological roles as spawning and nursery ground for many species of commercial importance has been declining in recent years. A mass-balanced trophic model was developed using Ecopath with Ecosim to evaluate the trophic structure of the Jiaozhou Bay for improving ecosystem management. The model were parameterized based on the fisheries survey data in the Jiaozhou Bay in 2011, including 23 species groups and one detritus group according to their ecological roles. The trophic levels of these ecological groups ranged from 1 (primary producers and detritus) to 4.3 (large demersal fishes). The estimated total system throughput was 12 917.10 t/(km2·a), with 74.59% and 25.41% contribution of the total energy flows from phytoplankton and detritus, respectively. Network analyses showed that the overall transfer efficiency of the ecosystem was 14.4%, and the mean transfer efficiency was 14.5% for grazing food chain and 13.9% for detritus food chain. The system omnivory index (SOI), Finn's cycled index (FCI) and connectance index (CI) were relatively low in this area while the total primary production/total respiration (TPP/TR) was high, indicating an immature and unstable status of the Jiaozhou Bay ecosystem. Mixed trophic impact analysis revealed that the cultured shellfish had substantial negative impacts on most functional groups. This study contributed to ecosystem-level evaluation and management planning of the Jiaozhou Bay ecosystem. |
| 中文摘要: |
| 近年来，胶州湾渔业资源呈现显著的下降趋势，同时其作为多种海洋经济种类的产卵场和育幼场功能也有明显的衰退。为了推动生态系统水平的胶州湾渔业资源管理，本研究在2011年拖网调查资料的基础上，通过Ecopath with Ecosim软件构建了胶州湾生物质平衡模型，以分析该生态系统的结构和功能。根据种类的生态习性，该模型将胶州湾生态系统种类划分为23个生物功能群和1个碎屑功能群。结果显示，胶州湾生态系统各功能群的营养级范围为1（初级生产者）~4.3（大型底栖鱼类）。生态系统总流量为12917.10/（km2·a），其中浮游植物和有机碎屑分别贡献了总流量的74.59%和25.41%。生态系统平均营养转换效率为14.4%，其中牧食食物链平均转换效率为14.5%，碎屑食物链的平均转换效率为13.9%。系统杂食性指数、Finn's循环指数和连接指数均较低，总初级生产量/总呼吸相对较高，表明胶州湾生态系统较为脆弱，呈现不成熟且非稳定的状态。混合营养分析结果表明养殖贝类对生态系统大部分功能群有明显的消极作用。本研究为对胶州湾进行生态系统水平的评价和管理提供了科学依据。 |
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