نوع مقاله : مقاله پژوهشی

نویسندگان

1 سازمان محیط زیست. رئیس پژوهش اداره کل محیط زیست استان البرز

2 گروه بیوتکنولوژی دانشکده علوم زیستی دانشگاه الزهرا تهران

چکیده

پیشینه مطالعه و هدف: دیاتومه‌ها یکی از مهمترین شاخه‌های جلبک‌ها هستند و به دو گروه دیاتومه‌های دراز و دیاتومه‌های گرد طبقه‌بندی می‌شوند. رودخانه طالقان یکی از مهمترین سر شاخه‌های رودخانه سپیدرود ایران است که طولی معادل 180 کیلومتر دارد. این مطالعه مکمل مطالعات قبلی دیاتومیست‌ها در رودخانه طالقان و معرفی رکورد جدید از دیاتومه‌ها در این حوزه می‌باشد.
روش مطالعه: این مطالعه از شهریور ماه 1398 تا شهریور 1399 و به طور فصلی از محل رسوبات دو ایستگاه بالا دست سد طالقان نمونه برداری شد. 60 میلی لیتر از رسوبات رودخانه به کمک سرنگی از عمق یک سانتی متری جمع آوری شد و در محلول فرمالین 4 درصد تثبیت شدند. از نمونه‌ها بر اساس دستور العمل استاندارد، اسلاید دائمی تهیه شد و با میکروسکوب نوری مورد بررسی قرار گرفتند.
نتایج: در طول نمونه برداری از دو ایستگاه بالادست سد طالقان گونه Pinnularia grunowii Krammer به عنوان یک رکورد جدید برای فلور دیاتومه های ایران شناسایی شد. از مهم‌ترین خصوصیات این گونه داشتن طرح کلی والو سه موج، استریا بدون انحنا و سایز آن می‌باشد که آن را از سایر گونه‌های مشابه همانند Pinnularia subanglica Petersen ، Pinnularia biceps Gregory، Krammer Pinnularia lundii var. linearis وPinnularia angusta var. angusta (Cleve) Krammer متمایز می‌کند.
نتیجه‌گیری: شناخت این گونه جدید در محیط طالقان ضرورت شناخت عوامل پراکنش و اکولوژیکی Pinnularia grunowii Krammer در سایر اکوسیستم‌های آبی ایران را آشکارتر می‌سازد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Pinnularia grunowii (Naviculales, Bacillariophyta), a New Record of diatom in the Taleghan River for Diatoms Flora of Iran

نویسندگان [English]

  • Ali Naseri 1
  • Mostafa Noroozi 2

1 Department of Environment, Alborz Province, Alborz, Iran

2 Department of Biotechnology, Faculty of Biological Sciences, University of Alzahra, Iran

چکیده [English]

Introduction and Aim: Diatoms are one of the most important branches of algae which are classified as pinnate and centric groups. Taleghan River is one of the main tributaries of Sepid Roud in Iran, which has 180 km in length. This study was complementary to the previous diatom projects in Taleghan River and introducing the new record for this area.
Methods: This study was carried out from Shahrivar 1398 to Shahrivar 1399 for one year and samples were collected seasonally from two upstream stations. 60 ml of precipitates was collected from 1 cm depth of the River using a syringe and fixed in 4% Formalin. The permanent slides were provided based on the standard protocol and the images were captured with a photomicroscope.
Results: During the sampling from two stations upstream of Taleghan Dam, Pinnularia grunowii Krammer was identified as a new record for the diatom flora of Iran. The most important morphological characters of this taxon are the valve outline treeudulate, non-curved striae, and it's size which make it different from the other similar taxa such as; Pinnularia subanglica Petersen, Pinnularia biceps Gregory, Pinnularia lundii var. linearis Krammer, and Pinnularia angusta var. angusta (Cleve) Krammer.
Conclusion: It is necessary to investigate in other ecosystems of Iran to understand the ecology and distribution of the Pinnularia grunowii Krammer.
 

کلیدواژه‌ها [English]

  • Diatom
  • Epipelic
  • New record
  • Pinnularia grunowii Krammer
  • Taleghan River
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