بررسی ترجیح زیستگاهی ماهی گل چراغ (Garra rufa) در رودخانۀ دینورآب، حوضۀ رودخانۀ کرخه

نوع مقاله : پژوهشی

نویسندگان

1 دانشجوی دکترای بوم‏شناسی آبزیان، گروه شیلات، دانشکدۀ منابع طبیعی، دانشگاه تهران، کرج، ایران

2 دانشیار گروه شیلات، دانشکدۀ منابع طبیعی، دانشگاه تهران، کرج، ایران‏

10.22059/ije.2022.326521.1522

چکیده

از آنجا که شاخص‏های انتخاب زیستگاه در ارائۀ ویژگی‏های زیستگاهی یک گونه و برنامه‏های حفاظتی به کار برده می‏شود، این مطالعه به‏منظور بررسی ترجیح زیستگاهی گونۀ گل چراغ، Garra rufa در رودخانۀ دینورآب (استان کرمانشاه)، یک سرشاخۀ حوضۀ رودخانۀ کرخه به اجرا درآمد. به این‏منظور، ویژگی‏های زیستگاهی شامل عمق آب، سرعت جریان آب، عرض رودخانه، عرض ناحیۀ پتامال (ناحیۀ حاشیۀ رودخانه)، نوع غالب پوشش سنگ بستر، pH، دما، هدایت الکتریکی (EC)، کل مواد جامد محلول (TDS) در 18 ایستگاه از پایین‌دست به سمت بالادست اندازه‏گیری و ثبت شدند. محدودۀ استفاده‏شده و محدودۀ زیستگاه انتخابی با توجه به میزان در دسترس بودن هر واحد زیستگاهی برای هر متغیر به‏‏دست آمد. نتایج نشان داد دامنۀ مطلوب‏ترین عمق 30>-26 سانتی‏متر با شاخص مطلوبیت 779/0، شاخص عرض رودخانه در دامنۀ 2/7>-6 متر با شاخص مطلوبیت 7/0، سرعت جریان در دامنۀ 31/0>-24/0 متر بر ثانیه با شاخص مطلوبیت 38/0، ساختار بستر با قطر متوسط در دامنۀ 5/5>-5 سانتی‏متر با شاخص مطلوبیت 1، دمای آب دامنه 19>-18 درجۀ سانتی‏گراد با شاخص مطلوبیت 618/0، pH در دامنۀ 44/7>-32/7 با شاخص مطلوبیت 545/0، EC آب در دامنۀ 310>-290 با شاخص مطلوبیت 767/0، TDS آب در دامنۀ 610>-580 ppm با شاخص مطلوبیت 712/0 و عرض ناحیۀ پتامال در دامنۀ 6>-8/4 متر با شاخص مطلوبیت 634/0 بود. نتایج نشان داد رودخانۀ مورد مطالعه برای گونۀ Garra rufa یک زیستگاه با مطلوبیت متوسط است.

کلیدواژه‌ها


عنوان مقاله [English]

Study of habitat preference of Garra rufa in Dinorab River, Karkheh River basin

نویسندگان [English]

  • Atta Mouludi-Saleh 1
  • Soheil Eagderi 2
  • Hadi Poorbagher 2
1 University of Tehran
2 University of Tehran
چکیده [English]

Since the selected habitat indexes provide a description of the habitat characteristics of a species, this study was conducted to investigate the habitat preference of Garra rufa in Dinorab River (Kermanshah Province), a tributary of the Karkheh River basin. For this purpose, the habitat characteristics, including water depth, water velocity, river width, potamal area width, predominant type of bedrock cover, pH, temperature, electrical conductivity (EC), total dissolved solids (TDS) were measured and recorded in 18 sub-stations belonging to six main stations from downstream to upstream. The used and selected habitat ranges were obtained according to the availability of each habitat unit for each variable. The results showed that the most preferred water depth is 26-30 m with a suitability index (SI) of 0.779, river width of 6-7.2 m with SI of 0.7, the water velocity 0.24-0.31 m/s with SI of 0.38, bed structure with medium diameter of 5-5.5 cm with SI of 1, water temperature 18-19 °C with SI of 0.618, pH 7.32-7.44 with SI of 0.545, EC 290-310 with SI of 0.767, TDS in the range of 580-610 ppm with SI of 0.712 and potamal width 4.8-6 with SI of 0.634. The results showed that the Dinorab River is a moderately suitable habitat for Garra rufa.

کلیدواژه‌ها [English]

  • Habitat Suitability
  • Garra rufa
  • Environmental variables
  • Dinorab River
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