مقایسه شاخص مطلوبیت و ترجیح زیستگاه سیاه ماهی مرکزی (Capoeta buhsei, Kessler 1877) در دو فصل پاییز و زمستان در رودخانه جاجرود، حوضه دریاچه نمک

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشیار گروه شیلات، دانشکده منابع طبیعی دانشگاه تهران، کرج، ایران.

2 دانش‌آموخته دکتری تخصصی، گروه شیلات، دانشکده منابع طبیعی، دانشگاه صنعتی اصفهان، اصفهان، ایران.

3 دانش‌آموخته دکتری تخصصی، گروه شیلات، دانشکده منابع طبیعی دانشگاه تهران، کرج، ایران.

10.22034/eiap.2024.191702

چکیده

این مطالعه به‌منظور مقایسه مطلوبیت و ترجیح زیستگاهی Capoeta buhsei در دو فصل پاییز و زمستان در رودخانه جاجرود از حوضه دریاچه نمک به اجرا در آمد. بدین منظور نمونه‌برداری در دو فصل پاییز (آبان ماه) و زمستان (اسفندماه) سال 1392 در رودخانه جاجرود از پایین‌‌دست به سمت بالادست رودخانه در 18 ایستگاه با استفاده از دستگاه الکتروشوکر صورت گرفت و متغیرهای محیطی از جمله ارتفاع از سطح دریا، عرض رودخانه، عمق آب، سرعت جریان آب، قطر متوسط سنگ غالب بستر، شیب بستر، pH، EC، TDS و دما مورد سنجش قرار گرفتند. نتایج نشان داد که زیستگاه ترجیحی گونه C.buhsei در فصل پاییز ارتفاع، عمق، شیب، عرض و سرعت جریان کم، سنگ‌های بستر درشت، دمای بالا، pH خنثی، EC بالا و TDS متوسط و در فصل زمستان دارای ارتفاع، عمق و عرض متوسط، سرعت جریان کم، شیب زیاد، دمای بالا، pH کمی اسیدی تا خنثی، EC کم و TDS کم می‌باشد. مقادیر پایین شاخص مطلوبیت برای فاکتورهای عرض رودخانه، سرعت جریان، قطر متوسط سنگ بستر، شیب بستر، دمای آب و EC باعث شده‌اندکه رودخانه جاجرود در فصل پاییز نسبت به فصل زمستان مطلوبیت کمتری داشته باشد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Comparison of Habitat Suitability of Namak Scraper, Capoeta buhsei Kessler, 1877 in Autumn and Winter Seasons in the Jajroud River, Namak Lake Basin

نویسندگان [English]

  • Soheil Eagderi 1
  • Mazaher Zamani-Faradonbeh 2
  • Atta Mouludi-Saleh 3
  • Hadi Poorbagher 1
1 Associate Professor, Department of Fisheries, Faculty of Natural Resources, University of Tehran. Karaj. Iran
2 PhD in Fisheries, Department of Fisheries, Faculty of Natural Resources, Isfahan University of Technology. Isfahan. Iran.
3 PhD in Fisheries, Department of Fisheries, Faculty of Natural Resources, University of Tehran. Karaj. Iran.
چکیده [English]

This study was conducted to investigate the habitat suitability and preference of Capoeta buhsei in autumn and winter in the Jajroud River, Namak Lake basin. For this purpose, in 2013, sampling was performed in autumn (November) and winter (March) in 18 stations from downstream to upstream using an electrofishing device and environmental variables, including altitude, river width, water depth, and velocity, the average diameter of the dominant bedrock, bed slope, pH, EC, TDS, and temperature were recorded. The results showed that the preferred habitat suitability of the studied species in autumn is lower height, depth, slope, width, and velocity, and coarse bed rocks, high temperature, neutral pH, high EC, and medium TDS, and in winter medium height, depth and width, low velocity, high slope and temperature, slightly acidic to neutral pH, low EC, and TDS. The low value of the suitability index for factors of river width, flow velocity, average bedrock diameter, bed slope, water temperature, and EC show the Jajrud River has less proper habitat in autumn than in winter.

کلیدواژه‌ها [English]

  • Capoeta buhsei
  • habitat suitability
  • Jajroud River
  • Namak Lake Basin
  • Environmental variables

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پژوهش های محیط زیست
دوره 14، شماره 28
مجله پژوهشی
اسفند 1402
صفحه 41-54

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