بررسی ترجیحات زیستگاهی سس ماهی کورا (Barbus lacerta; Heckel, 1843) در رودخانه کسلیان استان مازندران-ایران

نوع مقاله : مقاله کامل علمی - پژوهشی

نویسندگان

1 نویسنده مسئول، دکتری تولیدات و بهره‌برداری آبزیان، دانشگاه گنبد کاووس، گنبد کاووس، ایران

2 دانشیار گروه شیلات، دانشگاه گنبد کاووس، گنبد کاووس، ایران

3 استادیار گروه تنوع زیستی، دانشکده علوم محیطی، دانشگاه شهید بهشتی تهران، ایران

4 استادیار گروه شیلات، دانشگاه گنبد کاووس، گنبد کاووس، ایران

5 استاد گروه تنوع زیستی، دانشگاه بوکو، وین، اتریش

چکیده

متغیرهای محیطی به عنوان عاملی مهم در ترجیح و انتخاب زیستگاه توسط ماهیان در اکوسیستم آبی در نظر گرفته می‌شوند. بنابراین شناخت نیازهای زیستگاهی گونه‌های ساکن در آن امری ضروری بنظر می‌رسد. این مطالعه در فصل تابستان بر روی رودخانه کسلیان از زیرحوضه‌های مهم رودخانه تالار در شمال کشور برای بررسی ارجحیت زیستگاهی سس ماهی کورا (Barbus lacerta) در سنین مختلف مورد بررسی قرار گرفته است. ابتدا با توجه ویژگیهای زیستگاهی متنوع، سه سایت بر روی رودخانه فوق انتخاب و سپس با الکتروشوکر در 211 نقطه نمونه برداری انجام شد. در هر نقطه، پارامترهای محیطی نظیر سرعت، عمق، نوع بستر زیستی و بستر غیر زیستی نیز اندازه گیری و تعیین شدند. . نتایج نشان داده است که این ماهی در سنین مختلف ترجیحات زیستگاهی متفاوتی دارد. ترجیح کلی این گونه در محدوده سرعت ( 15-76 ) سانتی‌متر بر ثانیه و عمق ( 45-75 ) سانتی‌متر بوده است. ترجیح در بسترهای "غیرزیستی" و زیستی نیز به ترتیب "قطعه سنگ‌های بزرگ"، "قلوه سنگ" و ذرات درشت و ریز آلی، واریزه‌های چوبی و جاهایی که بخش‌های زنده گیاهان خشکی حضور دارند تعیین شد. آزمون لجستیک رگرسیون نیز متغیرهای سرعت و بستر غیرزیستی را مهمترین عامل در حضور این گونه تشخیص داد.. بطورکلی، شرایط متغیر محیطی این رودخانه، ترجیحات زیستگاهی متنوعی را برای این گونه در سنین مختلف فراهم نموده است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Study of habitat preferences of Kura barbel (Barbus lacerta; Heckel, 1843) in Kesilian River, Mazandaran Province, Iran

نویسندگان [English]

  • Mahin Sheikh 1
  • Rahman Patimar 2
  • Hossein Mostafavi 3
  • Mohammad Gholizadeh 4
  • Hojatollah Jafarian 2
  • Anderias Melcher 5
1 Corresponding Author, Ph.D. Aquaculture Production and Exploitation, Gonbad Kavous University, Gonbad Kavous, Iran. E-mail: sheikhmahin66@gmail.com
2 Associate Prof., Dept. of Fisheries, Gonbad Kavous University, Gonbad Kavous, Iran
3 . Assistant Prof., Dept. of Biodiversity Ecosystem Management, Institute of Environmental Science, Shahid Beheshti University, Tehran, Iran.
4 Assistant Prof., Dept. of Fisheries, Gonbad Kavous University, Gonbad Kavous, Iran
5 Professor, Dept. of Biodiversity, Boko University, Vienna, Austria
چکیده [English]

The Environmental variables are considered as important factors determining habitat preference and selection by fishes in the aquatic ecosystem. Therefore, it seems essential to know the habitat requirements of inhabiting species. This study in summer on Kesilian River, one of the considerable sub-basins of the Talar River in the north of country, was selected to investigate the habitat preferences of Kora Barbel (Barbus lacerta) at various ages. According to the diverse habitat characteristics, three sites were selected on the stream, and then samplings were carried out at 211 points using an electroshocker. At each point, environmental parameters including speed, depth, and type of biotic and abiotic substrate were measured and determined. The results showed that this species has different habitat preferences at different ages. General preferences of this species took place in the speed range of 15-76 cm/s and the depth of 45-75 cm. Preference for abiotic and biotic parameters of substrates included "block", "cubble" and coarse and fine particulates organic matter, wood and living parts of terrestrial plants, respectively. Regression logistic indicated that the variables including velocity and abiotic parameters of substrate are the most important factors in presence of this species in the stream. In general, the diverse environmental conditions of the stream have provided different habitat preferences for this species at different ages.

کلیدواژه‌ها [English]

  • Barbus lacerta
  • Habitat preferences
  • Biotic and abiotic parameters
  • Kesilian River
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