نشریه محیط زیست طبیعی

تنوع زیستی دیاتوم های رودخانه خرمارود، استان گلستان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زیست شناسی دانشکده علوم پایه دانشگاه گنبدکاووس

2 استادیار گروه زیست شناسی دانشکده علوم پایه دانشگاه گنبدکاووس

3 گروه شناخت مواد و تکنولوژی پژوهشکده حفاظت ومرمت آثار تاریخی-فرهنگی پژوهشگاه میراث فرهنگی و گردشگری

4 گروه شیمی دانشکده علوم پایه دانشگاه گنبدکاووس

چکیده

خرمارود از رودخانه های شهرستان آزادشهر در استان گلستان می‎باشد که از ارتفاعات جنوب‎شرقی این شهرستان سرچشمه گرفته به رودخانه گرگانرود و در نهایت دریای خزر می‎ریزد. دیاتوم‎ها، فلور جلبکی غالب را در اکوسیستم‎های آبی تشکیل می‎دهند و به عنوان معرف های شرایط محیطی مطرح هستند. به منظور شناسایی فلور دیاتومه‎ای خرمارود نمونه‎برداری طی تابستان و پاییز 1396 از بسترهای سنگی و رسوب انجام گرفت. در این مطالعه به طور کلی تعداد 60 گونه دیاتوم متعلق به 32 جنس و 20 تیره شناسایی شد. 59 گونه متعلق به رده Bacillariophyceae و تنها 1 گونه از رده Coscinodiscophyceaبود. بزرگترین جنس Nitzschiaبا 7 گونه بود و جنس‎های Navicula و Gomphonema با 5 گونه رده‎های بعدی را به خود اختصاص دادند. بیشترین فراوانی‎ها مربوط به گونه‎های Achnanthidium gracillimum، Achnanthidium minutissimum، Cocconeis placentula، Cymbella affinis، Encyonopsis minuta، Gomphonema olivaceum و Nitzschia inconspicua بود. براساس نتایج شاخص های تنوع ایستگاه سوم که تحت تأثیر روانابهای استخر پرورش ماهی قرار داشت دارای تنوع گونه ای کمتر و در وضعیت شدیداً آلوده قرار داشت و بقیه ایستگاهها کمی آلوده بودند. همچنین در تمامی ایستگاهها نمونه‎های مربوط به رسوب تنوع بیشتری نسبت به بستر سنگی داشتند که می تواند اینطور توجیه شود که نمونه های رسوب نسبت به بستر سنگی کمتر از وضعیت شیمیایی آب تأثیر می پذیرند.

کلیدواژه‌ها

عنوان مقاله [English]

Biodiversity of Diatoms in Khormarud River, Golestan Province

نویسندگان [English]

  • Abdolkarim AgAtabay 1
  • Jamileh Panahy Mirzahasanlou 2
  • Faramarz Rostami Charati 3
  • Reza Akbari 4

1 Department of biology faculty of basic science Gonbad Kavous university

2 Assitant Prof. Department of Biology, Faculty of Basic Science, Gonbad Kavous University, Gonbad Kavous, Iran

3 Research Center for Conservation of Culture Relics (RCCCR), Research institute of Cultural Heritage & Tourism

4 Department of Chemistry, Faculty of Basic Science Gonbad Kavous University

چکیده [English]

Khormarud is one of the Rivers in Azadshahr County in Golestan Province, which is originates from southeast elevations and discharges to the Gorganrud River that reach to the Caspian Sea. Diatoms constitute the dominant algal flora in aquatic ecosystems. In order to identifying diatom flora of Khormarud River, specimens were collected from stony and sediment substrates during summer and autumn of 2017. In total, 60 species belong to 32 genera and 20 families were identified, from which 59 species were belonging to class Bacillariophyceae and only one species to class Coscinodiscophyceae. Nitzschia with 7 species were the most species rich genus and Navicula and Gomphonema with 5 sp. were in the next order. The most abundant taxa were Achnanthidium gracillimum, Achnanthidium nanum, Cocconeis placentula, Cymbella affinis, Encyonopsis minuta, Gomphonema olivaceum and Nitzschia inconspicua. According to the results of diversity indices, site 3 which affected by runoff from fishery activities, had lowest species diversity and high pollution level. In total epipelic samples in all sites had high diversity than epilithic samples which could explain by the fact that algae on sediments are affected weakly by water column chemistry than epilithic algae.

کلیدواژه‌ها [English]

  • Taxonomy
  • Algae
  • Shannon diversity index
  • Flora
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نشریه محیط زیست طبیعی
دوره 73، شماره 4
اسفند 1399
صفحه 625-636