بررسی شاخص مطلوبیت زیستگاه سیاه‌ماهی (Capoeta gracilis, Keyserling 1861) در رودخانة طالقان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه شیلات، پردیس کشاورزی و منابع طبیعی کرج، دانشکدة منابع طبیعی، دانشگاه تهران.

2 استادیار گروه شیلات، پردیس کشاورزی و منابع طبیعی کرج، دانشکدة منابع طبیعی، دانشگاه تهران.

3 گروه تنوع زیستی، دانشکدة محیط زیست، دانشگاه آزاد اسلامی واحد علوم و تحقیقات تهران.

چکیده

در اجرای طرح‌های حفاظت از اکوسیستم‌های آبی و ماهیان، وجود دانش کافی دربارة نیازهای زیستگاهی گونه‌های آبزی اهمیت بسزایی دارد. از این رو، این مطالعه با هدف شناخت شاخص‌های مطلوبیت ویژگی‌های زیستگاهی گونة سیاه‌ماهی (Capoeta gracilis) در محدودة پراکنش آن در رودخانة طالقان انجام شد. برای بررسی ویژگی‌های زیستگاهی این گونه در این رودخانه فراوانی این ماهی و متغیرهای زیستگاهی شامل ارتفاع، عمق، عرض، سرعت جریان، قطر متوسط سنگ بستر و دمای آب در 33 ایستگاه از پایین‌دست به سمت بالادست رودخانة طالقان در مهرماه 1392 بررسی شد و محدودة زیستگاه انتخابی این گونه به دست آمد. مطابق نتایج، شاخص‌های مطلوبیت ویژگی‌های زیستگاهی این گونه ارتفاع 1550-1400 متر، عمق در دامنة 55-40 سانتی‌متر، عرض رودخانه با کم‌تر از 5 متر، سرعت در دامنة 6/0-3/0 متر بر ثانیه، قطر متوسط سنگ بستر در دامنة 45-30 سانتی‌متر و دما در دامنة 18-16 درجة سانتی‌گراد قرار داشت. وجود این شرایط با شاخص مطلوبیت زیستگاه 813/0 نشان می‌دهد که رودخانة طالقان برای گونة سیاه‌ماهی زیستگاهی با کیفیت بسیار عالی است.
 
 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Determination of habitat suitability index of Capoeta gracilis, Keyserling 1861 from Taleghan River

نویسندگان [English]

  • Mazaher Zamani Faradonbe 1
  • Soheil Eagderi 2
  • Narges Zarei 3
1 MSc student of Fisheries Department, Fisheries department, University of Tehran, Karaj. Iran
2 ssistant professor of Fisheries Department, Fisheries department, University of Tehran, Karaj. Iran.
3 MSc student of Biodiversity department, Environment Faculty, Islamic Azad University, Science and Research Branch, Tehran, Iran.
چکیده [English]

In fisheries and protection programs of aquatic ecosystems, knowledge on habitat requirement of aquatic animals plays important role. Hence, this study was conducted to investigate the suitability indexes of habitat features and habitat suitability index (HSI) of Capoeta gracilis in its distribution range in the Taleghan River. To study the habitat characteristics of this species in this River, its abundance and habitat variables, including elevation, depth, width, flow velocity, average diameter of substrate stones and water temperature at 33 stations from the downstream to upstream were examined during October 2013. According to the results, the suitability index of environmental features of this species were altitudes ranging 1400-1550 meters asl, depths in range 40-55 cm, river width lower than 5 m, velocity in range 0.3-0.6 m/s, with average diameter beds stone in range 30-45 cm and with temperature in range 16-18°C. Presence of these conditions with HIS of 0.813 indicates that Taleghan River is excellent habitat for C. gracilis.
 

کلیدواژه‌ها [English]

  • modeling
  • Suitability index
  • Habitat
  • Capoeta gracilis
  • Taleghan River

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