استفاده از روش هموارسازی هسته‌ای در بررسی ترجیح زیستگاهی سیاه‌ماهی بین‌النهرین (Valenciennes, 1842) Capoeta damascina در رودخانة سیروان

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه شیلات، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

چکیده

این مطالعه به‌منظور بررسی ترجیح زیستگاهی سیاه‌ماهی بین‌النهرین، Capoeta damascina در رودخانة سیروان با استفاده از روش هموارسازی هسته‌ای به‌اجرا درآمد. بدین منظور، در آبان‌ماه سال 1400 نمونه‌برداری از هشت ایستگاه هرکدام با 3 تکرار با استفاده از دستگاه الکتروشوکر صورت گرفت. در مجموع 135 نمونه صید، شناسایی و رهاسازی شدند. تعداد ده فاکتور زیستگاهی از جمله pH، دما، کل مواد جامد محلول، هدایت الکتریکی، ارتفاع از سطح دریا، عمق رودخانه، عرض، سرعت جریان، شیب و اکسیژن محلول اندازه‌گیری شد. نتایج نشان داد که بیشترین ترجیح زیستگاهی گونة مورد مطالعه در رودخانة سیروان در زیستگاه‌هایی است که  دارای pH تقریباً 6، دما 9 درجه سانتی‌گراد، کل مواد جامد محلول 200، هدایت الکتریکی 300 میکروموس بر سانتی‌متر، ارتفاع از سطح دریا 1130 متر، عمق 50 سانتی‌متر، عرض 9 متر، سرعت جریان 0/8متر بر ثانیه، شیب 2 درصد و اکسیژن 9 میلی گرم بر لیتر می­ باشند. مقادیر SI مربوط به دو فاکتور ارتفاع از سطح دریا (0/92) و اکسیژن (0/79) بیشترین مقادیر را داشتند. نتایج نشان داد که رودخانة سیروان با مقدار شاخص مطلوبیت 0/69زیستگاه مناسبی برای گونة سیاه ماهی بین‌النهرین است.

کلیدواژه‌ها

عنوان مقاله [English]

Using kernel smoothing method in evaluating habitat preference of Mesopotamian barb, Capoeta damascina (Valenciennes, 1842) in Sirvan River

نویسندگان [English]

  • Atta Mouludi-Saleh
  • Soheil Eagderi
  • Hadi Poorbagher

Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran

چکیده [English]

This study was conducted to investigate the habitat preference of Capoeta damascina in the Sirvan River using the kernel smoothing method. For this purpose, in November 2021, eight stations each with 3 replications were sampled using an electrofishing device. A total of 135 specimens were sampled, identified and released. Ten environmental factors, including pH, temperature, total dissolved solids, electrical conductivity, altitude, depth, width, velocity, slope and dissolved oxygen were measured. The results showed that the habitat preference of C. damascina in the Sirvan River based on the studied factors are habitats with pH of approximately 6, temperature 9°C, total dissolved solids 200, electrical conductivity 300 μS/cm, altitude 1130m, depth 50 cm, width 9 m, velocity 0.8 m/s, slope 2% and oxygen 9 mg/liter. The SI values of altitude (0.92) and oxygen (0.79) had the highest values. The results showed, Sirvan River with HSI value of 0.69 is a suitable habitat for C. damascina.

کلیدواژه‌ها [English]

  • Mesopotamian barb
  • Kernel smoothing
  • Habitat preference
  • Ecology
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