بررسی ترجیح زیستگاهی جویبار‌ماهی سانیا (Cobitis saniae) در رودخانة سفیدرود

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه شیلات، دانشکدة منابع طبیعی، دانشگاه گیلان، صومعه‌سرا، ایران.

2 گروه شیلات، دانشکدة منابع طبیعی، دانشگاه تهران، دانشکدگان کشاورزی و منابع طبیعی، کرج، ایران.

10.22059/jne.2024.369752.2629

چکیده

در مباحث  بوم‌شناختی، درک نیازهای ماهیان در اکوسیستم‌های آبی از اهمیت خاصی برخوردار است. از این‌رو مطالعة حاضر به‌منظور بررسی و شناخت الگوی ترجیح زیستگاهی گونه جویبارماهی سانیا (Cobitis saniae) در رودخانه سفیدرود انجام شد. برای این تحقیق، نمونه‌برداری در طول رودخانه از پایین‌دست به بالادست در هشت ایستگاه هر کدام با سه تکرار انجام شد. در مجموع تعداد 28 فاکتور محیطی و فیزیکوشیمیایی در ایستگاه‌ها ثبت و اندازه‌گیری شد. نتایج بررسی ترجیح زیستگاهی براساس فاکتورهای مورد بررسی نشان داد که با افزایش مقادیر ارتفاع از سطح دریا، عمق، عرض رودخانه، شوری، pH، قلیائیت، TDS، TSS، سختی کل، کدورت، EC، COD، نیترات، فسفات، آمونیاک، کلسیم، منیزیم، پتاسیم، سدیم و سولفات در نهایت مقادیر مطلوبیت کاهش یافت. یافته‌ها نشان داد که بیشترین و کمترین مطلوبیت به‌ترتیب مربوط دو فاکتور پتاسیم (0/8810) و آمونیاک (0/396) بود. به‌طور کلی رودخانة ‌سفیدرود برای جویبار‌ماهی سانیا یک زیستگاه متوسط تا مطلوب ارزیابی شد. نتایج این مطالعه می‌تواند در راستای حفاظت از این گونه در شرایط تنش‌زا و بهره‌برداری بهینه از رودخانة سفید‌رود مفید واقع گردد.

کلیدواژه‌ها

عنوان مقاله [English]

Habitat suitability indices of Sania’s spined loach (Cobitis saniae) in the Sefidroud River

نویسندگان [English]

  • Hojjat Sohrabi 1
  • Hamed Mousavi-Sabet 1
  • Soheil Eagderi 2

1 Department of Fisheries, Faculty of Natural Resources, University of Guilan, Sowmeh Sara, Iran.

2 Department of Fisheries, Faculty of Natural Resources, University College of Agriculture and Natural Resources, University of Tehran, Karaj, Iran.

چکیده [English]

In conservation and fisheries concepts, understanding the needs of fish in the aquatic ecosystems is important. Therefore, the present study was carried out to investigate and identify the habitat preference pattern of Cobitis saniae in the Sefidroud River. For this purpose, sampling was carried out along the river from downstream to upstream at eight sampling sites each with three repetitions. A total of 28 environmental and physicochemical factors were recorded and measured. The results of the habitat preference based on the studied factors showed that the increase in the values of altitude, depth, river width, salinity, pH, alkalinity, TDS, TSS, hardness, turbidity, EC, COD, No3, PO4, NH3, Ca, Mg, K, Na, and SO4, decreased the habitat suitability indices. The findings showed that the highest and lowest preferences were related to the two factors K (0.881) and NH4 (0.369), respectively. In general, the Sefidroud River was assessed as a moderate to favorable habitat for Sania’s spined loach. The results of this study can be useful to the conservation programs for this species in stressful conditions and for optimum exploitation of the Sefidroud River.

کلیدواژه‌ها [English]

  • Biological conservation
  • Cobitidae
  • Habitat suitability index
  • Sustainable exploitation
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