اخبار و اعلانات

 آمار

تعداد نشریات283
تعداد نشریات سازمان81
تعداد شماره‌ها2,726
تعداد مقالات31,042
تعداد مشاهده مقاله27,944,722
تعداد دریافت فایل اصل مقاله16,240,656
Tajzadehnamin, Mona, Valinassab, Tooraj, Ramezani- Fard, Ehsan, Ehteshami, Fariborz. (1399). Trophic dynamics analysis and ecosystem structure for some fish species of northern Oman Sea. سامانه مدیریت نشریات علمی, 19(6), 2804-2823. doi: 10.22092/ijfs.2020.122699
Mona Tajzadehnamin; Tooraj Valinassab; Ehsan Ramezani- Fard; Fariborz Ehteshami. "Trophic dynamics analysis and ecosystem structure for some fish species of northern Oman Sea". سامانه مدیریت نشریات علمی, 19, 6, 1399, 2804-2823. doi: 10.22092/ijfs.2020.122699
Tajzadehnamin, Mona, Valinassab, Tooraj, Ramezani- Fard, Ehsan, Ehteshami, Fariborz. (1399). 'Trophic dynamics analysis and ecosystem structure for some fish species of northern Oman Sea', سامانه مدیریت نشریات علمی, 19(6), pp. 2804-2823. doi: 10.22092/ijfs.2020.122699
Tajzadehnamin, Mona, Valinassab, Tooraj, Ramezani- Fard, Ehsan, Ehteshami, Fariborz. Trophic dynamics analysis and ecosystem structure for some fish species of northern Oman Sea. سامانه مدیریت نشریات علمی, 1399; 19(6): 2804-2823. doi: 10.22092/ijfs.2020.122699

Trophic dynamics analysis and ecosystem structure for some fish species of northern Oman Sea

Iranian Journal of Fisheries Sciences
دوره 19، شماره 6، بهمن 2020، صفحه 2804-2823    اصل مقاله (778.39 K)
نوع مقاله: Research Paper
شناسه دیجیتال (DOI): 10.22092/ijfs.2020.122699
نویسندگان
Mona Tajzadehnamin1؛ Tooraj Valinassab* 2؛ Ehsan Ramezani- Fard2؛ Fariborz Ehteshami2
1Study of ecology models, simulation of relationships and food levels
2Fishery
چکیده
In the present study, a trophic structure model for some fish species of the northern Oman Sea is developed through using mass balance modeling software, Ecopath with Ecosim (EwE). In this model, we simulated 16 functional groups spread across an area of 3998.20 km2 from 2017 to 2018. Mean trophic level in the area of the present study was 3.49. Values calculated for system omnivory and connectance indices were 0.42 and 0.44, respectively. However, the values of ecotrophic efficiency in the model were high (>0.5) for most consumers of high trophic levels except for sharks and rays because of their high fishing mortality. Accordingly, mixed trophic impact showed that phytoplankton and detritus positively impacted almost all ecological groups. Also bentho-pelagics, the medium demersals, benthos, and crustaceans had a very negative impact on themselves due to cannibalism. Furthermore, the highest realized trophic level was 4.34 for sharks. The maximum omnivory index is calculated as 0.99 for medium demersals for feeding on a wide variety of preys. Also, the average catch per net primary production, i.e., the gross efficiency of the system was around 0.000198 (lower than the global average) indicating that the fishery is harvesting fishes high in the food chain. The primary production/respiration (PP/R) ratio is found to be 3.57 and the values of ascendancy (45.40%) and overhead (54.60%) showed stability of the ecosystem. Thus northern Oman Sea can be classified as an immature ecosystem (in the developmental stage), although it has some kind of system maturity. Accordingly, the food web of northern Oman Sea is consisted mostly of detritivorous, planktivorous, and carnivorous fish species. Besides, Ecopath with Ecosim (EwE) software can be an excellent option to examine interactions among ecological groups, and the impact of fishing in northern Oman Sea which is unquestionably helpful to develop concrete management strategies. The proper ecosystem-based fisheries management practice can improve the efficiency of this overexploited ecosystem.
کلیدواژه‌ها
Connectance index؛ Ecopath؛ Ecotrophic efficiency؛ Fishery management؛ Omnivory index؛ Mixed trophic impact
آمار
تعداد مشاهده مقاله: 213
تعداد دریافت فایل اصل مقاله: 162


counter
سامانه مدیریت نشریات علمی. قدرت گرفته از سیناوب