Study of the genera Encyonema, Craticula, and Cymatopleura (Bacillariophyta) in the western rivers of Lake Urmia, Iran

Document Type : Research Paper

Authors

1 Department of Plant Science, School of Biology, College of Science, University of Tehran, Tehran, Iran

2 Department of Plant, Cell and Molecular Biology, Faculty of Natural Sciences, University of Tabriz, Tabriz, Iran

10.22092/ijb.2022.128207

Abstract

This study is the first attempt to investigate some diatom species in the western rivers of Lake Urmia. The study presents the details of Encyaonema, Craticula, and Cymatopleura at the lowest taxonomic level to provide information in terms of species taxonomy, morphology and ecology. In order to determine the morphological similarities in species level of the aforementioned genera, 14 sites were repeatedly sampled along the rivers from September 2021 to August 2022. The results showed a high diversity of diatoms including Encyonema caespitosum. Encyonema silesiacum, Encyonema prostratum, Craticula cuspidata, Craticula ambigua, Cymatopleura solea, Cymatopleura apiculata, Cymatopleura hibernica and Cymatopleura elliptica. The taxonomic and ecological study of the observed species from the western rivers of Lake Urmia indicates diatom assemblage closely integrated with the limnology and ecological status of the rivers. Indeed, the results infer that the rivers undergo a transition from freshwater to brackish, particularly where the rivers terminate at Lake Urmia.

Keywords

Article Title [Persian]

مطالعه دیاتومه‌های سرده‌های Encyonema، Craticula و Cymatopleura (Bacillariophyta) در رودخانه‌های غربی دریاچه ارومیه، ایران

Authors [Persian]

  • سید رضا مهرجویان 1
  • احسان عطازاده 2
1 دانشکده زیست شناسی، دانشکدگان علوم، دانشگاه تهران، تهران، ایران
2 دانشگاه تبریز
Abstract [Persian]

این مطالعه اولین گزارش برای بررسی برخی از گونه‌های دیاتومه در رودخانه‌های غربی دریاچه ارومیه است. این مطالعه جزئیات جنس­های Encyaonema، Craticula و Cymatopleura را در پایین‌ترین سطح طبقه‌بندی ارائه می‌کند تا اطلاعاتی از نظر تاکسونومی، مورفولوژی و اکولوژی گونه‌ها بدست آید. به منظور تعیین شباهت­های مورفولوژیکی در سطح گونه‌های جنس‌های فوق الذکر، از 14 ایستگاه در طول رودخانه‌ها به طور مکرر از سپتامبر 2021 تا آگوست 2022 نمونه‌برداری شد. نتایج نشان­دهنده تنوع بالای دیاتومه­ها از جمله Encyonema caespitosum, Encyonema silesiacum، Encyonema prostratum، Craticula cuspidata، Craticula ambigua،Cymatopleura solea، Cymatopleura apiculata، Cymatopleura hibernica وCymatopleura elliptica  بود. بررسی تاکسونومیکی و اکولوژیکی گونه‌های مشاهده‌شده از تمامی رودخانه‌های غربی دریاچه ارومیه نشان می‌دهد که تجمع دیاتومه‌ها کاملا مرتبط با لیمنولوژی و وضعیت اکولوژیکی این رودخانه‌ها است. در واقع، نتایج چنین بیان می‌کنند که رودخانه‌ها به ویژه در حوالی مناطقی که به دریاچه ارومیه منتهی می‌شوند، از آب شیرین به لب شور تبدیل می‌شوند.

Keywords [Persian]

  • Lake Urmia
  • Rivers
  • diatom taxonomy
  • Encyonema
  • Craticula
  • Cymatopleura

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The Iranian Journal of Botany
Volume 28, Issue 2
December 2022
Pages 182-199

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History

  • Receive Date: 12 September 2022
  • Revise Date: 24 November 2022
  • Accept Date: 10 December 2022

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