Research Article: Trophic dynamics analysis and ecosystem structure for some fish species of northern Oman Sea
محل انتشار: مجله علوم شیلات ایران، دوره: 19، شماره: 6
سال انتشار: 1399
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 132
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شناسه ملی سند علمی:
JR_JIFRO-19-6_004
تاریخ نمایه سازی: 23 بهمن 1400
چکیده مقاله:
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 ۱۶ functional groups spread across an area of ۳۹۹۸.۲۰ km۲ from ۲۰۱۷ to ۲۰۱۸. Mean trophic level in the area of the present study was ۳.۴۹. Values calculated for system omnivory and connectance indices were ۰.۴۲ and ۰.۴۴, respectively. However, the values of ecotrophic efficiency in the model were high (>۰.۵) 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 ۴.۳۴ for sharks. The maximum omnivory index is calculated as ۰.۹۹ 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 ۰.۰۰۰۱۹۸ (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 ۳.۵۷ and the values of ascendancy (۴۵.۴۰%) and overhead (۵۴.۶۰%) 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.
کلیدواژه ها:
نویسندگان
M. Tajzadeh Namin
Study of ecology models, simulation of relationships and food levels
T. Valinassab
Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization (AREEO). Tehran, Iran.
E. Ramezani- Fard
Department of Marine Biology, Tehran Science and Research Branch, Islamic Azad University, Tehran, Iran.
F. Ehteshami
Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization (AREEO). Tehran, Iran.
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