The Jimo coast encompasses an area of 2157 km^2, and the ecosystem is valuable both socially and economically with regional fisheries substantially contributing to the value. A mass-balanced trophic model consisting o...The Jimo coast encompasses an area of 2157 km^2, and the ecosystem is valuable both socially and economically with regional fisheries substantially contributing to the value. A mass-balanced trophic model consisting of 15 functional ecological groups was developed for the coastal ecosystem using the Ecopath model in Ecopath with Ecosim(Ew E) software(version 6.4.3). The results of the model simulations indicated that the trophic levels of the functional groups varied between 1.0 and 3.76, and the total production of the system was estimated to be 5112.733 t km^(-2) yr^(-1) with a total energy transfer efficiency of 17.6%. The proportion of the total flow originating from detritus was estimated to be 48%, whereas that from primary producers was 52%, indicating that the grazing food chain dominated the energy flow. The ratio of total primary productivity to total respiration in the system was 3.78, and the connectivity index was 0.4. The fin cycling index and the mean path length of the energy flow were 4.92% and 2.57%, respectively, which indicated that the ecosystem exhibits relatively low maturity and stability. The mixed trophic impact(MTI) procedure suggested that the ecological groups at lower trophic levels dominated the feeding dynamics in the Jimo coastal ecosystem. Overfishing is thought to be the primary reason for the degeneration of the Jimo coastal ecosystem, resulting in a decline in the abundance of pelagic and demersal fish species and a subsequent shift to the predominance of lower-trophic-level functional groups. Finally, we offered some recommendations for improving current fishery management practices.展开更多
Ecopath model is an important evaluation model in the field of ecological research.At present,Ecopath model is mainly applied in the structure of food web,material circulation and energy flow,environmental capacity an...Ecopath model is an important evaluation model in the field of ecological research.At present,Ecopath model is mainly applied in the structure of food web,material circulation and energy flow,environmental capacity and so on.The Ecopath models in ocean,lake and reservoir ecosystems were reviewed,including the ecological nutrient conversion efficiency(EE),ecosystem characteristic index(CI),Niche Overlap and energy flow characteristics of trophic level.The practical significance of Ecopath model in marine ecosystem evaluation and application is expounded by comparing and analyzing the literature data,which provides the technical support for the scientific management of inland ecosystem in the future.展开更多
为探讨莱州湾生态系统年代际变化,基于莱州湾1980年代(1980s)和2020年代(2020s)相关数据,应用Ecopath with Ecosim(EwE)软件,分别构建莱州湾1980s和2020s的Ecopath模型,对比莱州湾生态系统年代际的结构和功能差异。结果显示,两个年代莱...为探讨莱州湾生态系统年代际变化,基于莱州湾1980年代(1980s)和2020年代(2020s)相关数据,应用Ecopath with Ecosim(EwE)软件,分别构建莱州湾1980s和2020s的Ecopath模型,对比莱州湾生态系统年代际的结构和功能差异。结果显示,两个年代莱州湾生态系统均存在牧食食物链和碎屑食物链两种能量传递途径,能量流动主要集中在低营养级,能量流动规律符合金字塔逐级递减规律;与1980s相比,2020s莱州湾生态系统功能组营养级下降,生物量减少;2020s莱州湾流向碎屑量和系统总流量降低,资源再循环效率提高,总初级生产量/总呼吸量和系统净生产量降低,Finn’s循环指数和Finn’s平均路径长度增大,连接指数增大。研究表明,2020s莱州湾生态系统规模比1980s有所下降,生态系统的稳定性有所提高。展开更多
定量化评估航道工程建设期的生态环境影响,对于后续生态修复措施制定具有重要意义。本研究根据2022年及2024年生态调查数据,采用Ecopath with Ecosim 6.7.0软件构建了包含15个功能组在内的宿连航道(京杭运河至盐河段)整治工程二期工程...定量化评估航道工程建设期的生态环境影响,对于后续生态修复措施制定具有重要意义。本研究根据2022年及2024年生态调查数据,采用Ecopath with Ecosim 6.7.0软件构建了包含15个功能组在内的宿连航道(京杭运河至盐河段)整治工程二期工程连云港段施工前、施工期Ecopath模型,模拟不同时间点生态系统内部能流过程,分析生态系统总体特征、成熟度和稳定性,确定关键功能组。结果显示,该段航道生态系统主要有5个整合营养级,最高营养级均为鲌类,生物量、流量分布呈典型的金字塔形。施工期生态系统总规模减至施工前的60.96%,施工期总能量传递效率略有增加,航道生态系统成熟度和稳定性有所降低,工程建设对水生生态系统造成了一定影响。生态系统关键功能组为鲌类、其他底栖动物、浮游植物,后期可通过增殖放流鱼类和底栖生物以及控制外源营养盐输入,促进航道生态系统稳定性恢复。展开更多
基金the financial support provided by the National Social Science Foundation (Grant No.12JJD790032)the Project of the Chinese Ministry of Education (Grant No.13JJD790032)
文摘The Jimo coast encompasses an area of 2157 km^2, and the ecosystem is valuable both socially and economically with regional fisheries substantially contributing to the value. A mass-balanced trophic model consisting of 15 functional ecological groups was developed for the coastal ecosystem using the Ecopath model in Ecopath with Ecosim(Ew E) software(version 6.4.3). The results of the model simulations indicated that the trophic levels of the functional groups varied between 1.0 and 3.76, and the total production of the system was estimated to be 5112.733 t km^(-2) yr^(-1) with a total energy transfer efficiency of 17.6%. The proportion of the total flow originating from detritus was estimated to be 48%, whereas that from primary producers was 52%, indicating that the grazing food chain dominated the energy flow. The ratio of total primary productivity to total respiration in the system was 3.78, and the connectivity index was 0.4. The fin cycling index and the mean path length of the energy flow were 4.92% and 2.57%, respectively, which indicated that the ecosystem exhibits relatively low maturity and stability. The mixed trophic impact(MTI) procedure suggested that the ecological groups at lower trophic levels dominated the feeding dynamics in the Jimo coastal ecosystem. Overfishing is thought to be the primary reason for the degeneration of the Jimo coastal ecosystem, resulting in a decline in the abundance of pelagic and demersal fish species and a subsequent shift to the predominance of lower-trophic-level functional groups. Finally, we offered some recommendations for improving current fishery management practices.
基金supported by the National large-scale freshwater fish industry technology system(CARS-45)Tianjin Freshwater Aquaculture Industry Technology System Innovation Team+2 种基金Tianjin Science and Technology Program(16zzync00100)Tianjin Science and Technology Program(18ZXZYNC00150)the Opening Foundation of Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria(2019-04).
文摘Ecopath model is an important evaluation model in the field of ecological research.At present,Ecopath model is mainly applied in the structure of food web,material circulation and energy flow,environmental capacity and so on.The Ecopath models in ocean,lake and reservoir ecosystems were reviewed,including the ecological nutrient conversion efficiency(EE),ecosystem characteristic index(CI),Niche Overlap and energy flow characteristics of trophic level.The practical significance of Ecopath model in marine ecosystem evaluation and application is expounded by comparing and analyzing the literature data,which provides the technical support for the scientific management of inland ecosystem in the future.
文摘为探讨莱州湾生态系统年代际变化,基于莱州湾1980年代(1980s)和2020年代(2020s)相关数据,应用Ecopath with Ecosim(EwE)软件,分别构建莱州湾1980s和2020s的Ecopath模型,对比莱州湾生态系统年代际的结构和功能差异。结果显示,两个年代莱州湾生态系统均存在牧食食物链和碎屑食物链两种能量传递途径,能量流动主要集中在低营养级,能量流动规律符合金字塔逐级递减规律;与1980s相比,2020s莱州湾生态系统功能组营养级下降,生物量减少;2020s莱州湾流向碎屑量和系统总流量降低,资源再循环效率提高,总初级生产量/总呼吸量和系统净生产量降低,Finn’s循环指数和Finn’s平均路径长度增大,连接指数增大。研究表明,2020s莱州湾生态系统规模比1980s有所下降,生态系统的稳定性有所提高。
文摘定量化评估航道工程建设期的生态环境影响,对于后续生态修复措施制定具有重要意义。本研究根据2022年及2024年生态调查数据,采用Ecopath with Ecosim 6.7.0软件构建了包含15个功能组在内的宿连航道(京杭运河至盐河段)整治工程二期工程连云港段施工前、施工期Ecopath模型,模拟不同时间点生态系统内部能流过程,分析生态系统总体特征、成熟度和稳定性,确定关键功能组。结果显示,该段航道生态系统主要有5个整合营养级,最高营养级均为鲌类,生物量、流量分布呈典型的金字塔形。施工期生态系统总规模减至施工前的60.96%,施工期总能量传递效率略有增加,航道生态系统成熟度和稳定性有所降低,工程建设对水生生态系统造成了一定影响。生态系统关键功能组为鲌类、其他底栖动物、浮游植物,后期可通过增殖放流鱼类和底栖生物以及控制外源营养盐输入,促进航道生态系统稳定性恢复。
