مطالعۀ فلور و تنوع جلبک‌های فیتوپلانکتونی سد یامچی، استان اردبیل

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استادیار گروه زیست‌شناسی، دانشکدۀ علوم، دانشگاه گنبد‌کاووس، گنبدکاووس، ایران

2 استادیار مؤسسۀ تحقیقات بین‌المللی تاسماهیان دریای خزر، رشت، ایران

3 دانشیار گروه شیلات، دانشکدۀ منابع طبیعی، دانشگاه گیلان، صومعه‌سرا، ایران

چکیده

چکیده
فیتوپلانکتون‌ها تولیدکنندگان اولیه در اکوسیستم‌های آبی و بخشی از پایۀ شبکه‌های غذایی‌اند. سد یامچی روی رودخانۀ بالیخلو (شمال‌غرب ایران) ساخته شده است؛ با‌توجه‌به اینکه تاکنون مطالعه‌ای دربارۀ فیتوپلانکتون‌های این سد انجام نشده است و نظر به اهمیت فیتوپلانکتون‌ها در درک عملکرد زیستی دریاچه‌ها و ردیابی تغییرات آنها، مطالعۀ حاضر با هدف بررسی فلوریستیک فیتوپلانکتون‌های این دریاچه انجام شد. به‌طور‌کلی، 62 تاکسون فیتوپلانکتونی در بررسی حاضر شناسایی شدند که به 50 جنس، 39 تیره و 9 رده از جلبک‌ها تعلق داشتند. در بین رده‌ها Bacillariophyceae با 23 گونه، Chlorophyceae با 12 گونه و Cyanophyceae با 10 گونه بیشترین تعداد گونه‌ها را به خود اختصاص دادند. Baciillariaceae و Scenedesmaceae هرکدام با 6 گونه بزرگ‌ترین تیره‌ها و Nitzschiaبا 4 گونه بزرگ‌ترین جنس فیتوپلانکتونی شناسایی‌شده در دریاچه بودند. در مطالعۀ حاضر، بیشترین مقادیر تنوع در اواخر بهار و ماه‌های تابستان مشاهده شد که به‌علت مناسب‌بودن شرایط برای رشد و وقوع هم‌زمان جلبک‌های سبز و سیانوباکتری‌ها (نه به‌علت کیفیت خوب آب در این ماه‌ها) بود. کمترین مقادیر شاخص تنوع در پاییز محاسبه شد و شرایط رشدی تنها برای دیاتومه‌ها مناسب بود که تنها با یک گونۀ غالب Stephanodiscus neoastraea در دریاچه مشاهده شدند.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of the Flora and Diversity of Phytoplanktonic Algae in Yamchi Dam, Ardabil Province

نویسندگان [English]

  • Jamileh Panahy Mirzahasanlou 1
  • Zohreh Ramezanpour 2
  • Javid Imanpour Namin 3
1 Assistant Professor Department of Biology, Faculty of Basic Science, Gonbad Kavous University, Gonbad Kavous, Iran
2 Assistant Professor International Sturgeon Research Institute, Rasht, Iran
3 Associate Professor Department of Fishery, Faculty of Natural Resources, University of Guilan, Somee Sara, Iran
چکیده [English]

Abstract
Phytoplanktons are primary producers in aquatic ecosystems, and form part of the basis of the food webs in these ecosystems. Yamchi dam was constructed on Balikhlu River (northwest of Iran). Considering that there was no study of phytoplankton in Yamchi dam, While phytoplanktons are important in understanding the biological function of lakes and detect changes in them, this investigation was carried out to study the floristic composition of phytoplanktons in this lake. In total, 62 Phytoplankton taxa were identified. These belong to 50 genera, 39 families and 9 classes of the algae. Among classes identified in this study, most species were designated to 3 classes: Bacillariophyceae with 23 sp. Chlorophyceae with 12 sp. and Cyanophyceae with 10 sp. Bacillariaceae and Scenedesmaceae each with 6 sp. are the largest families and Nitaschia with 4 sp. is the largest genus identified in the lake, respectively. In the present study, the highest value of diversity was observed in late spring and summer months, which was due to the conditions suitable for growth and co-occurrence of green algae and cyanobacteria, rather than the good quality of water in these months. The lowest values of the diversity index were calculated in the autumn, that the growth condition was suitable for diatoms, with the dominant species of Stephanodiscus neostraea.
 

کلیدواژه‌ها [English]

  • Balikhlu River
  • Diversity Index
  • Evenness
  • Phytoplankton Abundance
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