استفاده از ترکیب جوامع درشت بی‌مهرگان کفزی به منظور ارزیابی کیفیت آب رودخانه کرج (استان البرز)

نوع مقاله : مقاله کامل علمی - پژوهشی

نویسندگان

1 دانش‌آموخته کارشناسی‌ارشد محیط زیست دریایی، دانشکده محیط زیست، سازمان حفاظت محیط زیست، کرج، ایران.

2 . نویسنده مسئول، استادیار گروه محیط زیست دریایی، دانشکده محیط زیست، سازمان حفاظت محیط زیست، کرج، ایران و گروه تنوع زیستی و ایمنی زیستی، پژوهشکده محیط زیست و ‏توسعه پایدار، سازمان حفاظت محیط زیست، تهران، ایران

3 . استادیار گروه محیط زیست دریایی، دانشکده محیط زیست، سازمان حفاظت محیط زیست، کرج، ایران و گروه تنوع زیستی و ایمنی زیستی، پژوهشکده محیط زیست و ‏توسعه پایدار، سازمان حفاظت محیط زیست، تهران، ایران

4 دانشیار گروه محیط زیست طبیعی و تنوع زیستی، دانشکده محیط زیست، سازمان حفاظت محیط زیست، کرج، ایران و گروه تنوع زیستی و ایمنی زیستی، پژوهشکده محیط زیست و ‏توسعه پایدار، سازمان حفاظت محیط زیست، تهران، ایران.

چکیده

شرایط کیفی آب‌های جاری تحت‌تاثیر عوامل انسانی طوری تغییر کرده که تصفیه طبیعی قادر به رفع آلودگی نیست. با مطالعه شرایط کیفی عوامل موثر تشخیص داده می‌شود. درشت بی‌مهرگان کفزی به دلیل ظرفیت تحمل متفاوت، در مطالعات شرایط کیفی آب‌ها به عنوان شاخص زیستی استفاده می‌شوند. هدف اصلی این مطالعه بررسی شرایط کیفی آب رودخانه کرج با استفاده از جوامع درشت بی‌مهرگان کفزی بود. نمونه‌برداری از درشت بی‌مهرگان کفزی در دو فصل پاییز (1397) و بهار (1398) به کمک نمونه‌بردار سوربر با چشمه تور250 میکرون در 10 ایستگاه انجام شد. تعداد 7985 نمونه متعلق به 10 راسته و 38 خانواده شناسایی شدند. در فصل پاییز بیشترین فراوانی مربوط به خانوادهBaetidae (6/35 درصد) و در فصل بهار مربوط به خانواده Chironomidae (5/53 درصد) بود. یافته‌ها نشان داد شرایط کیفی در ایستگاه‌های نمونه‌برداری متفاوت بود. در فصل پاییز هیچ کدام از ایستگاه‌ها در طبقه کیفی ضعیف نبودند اما در فصل بهار ایستگاه‌های وارنگه رود، دوآب، هفت چشمه، کجور و آدران بر اساس شاخص‌های EPT و HFBI در طبقات ضعیف و بد قرار گرفتند. بر اساس نتایج شرایط کیفی آب رودخانه کرج در فصل پاییز نسبتاً مناسب اما در فصل بهار افت در شرایط کیفی آب دیده شد. همچنین یافته‌های این مطالعه اهمیت کاربرد شاخص‌های زیستی در تعیین شرایط کیفی آب را نشان داد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Using Benthic Macroinvertebrate Population Composition for Assessing Water Quality of Karaj River (Alborz Province)

نویسندگان [English]

  • Samaneh Davoudi 1
  • Javad Ramezani 2
  • MohamamdReza Rahmani 3
  • Bagher Nezami Balouchi 4
  • Hanieh Soufi 1
1 M.Sc. Graduate of Marine Environment, College of Environment, Karaj, Iran
2 Corresponding Author, Assistant Prof., Dept. of Marine Environment, College of Environment, Karaj, Iran and Dept. of Biodiversity and Biosafety, Research Center for Environment and Sustainable Development, Dept. of the Environment, Tehran, Iran
3 Assistant Prof., Dept. of Marine Environment, College of Environment, Karaj, Iran and Dept. of Biodiversity and Biosafety, Research Center for Environment and Sustainable Development, Dept. of the Environment, Tehran, Iran.
4 Associate Prof., Dept. of Natural Environment and Biodiversity, College of Environment, Karaj, Iran and Dept. of Biodiversity and Biosafety, Research Center for Environment and Sustainable Development, Dept. of the Environment, Tehran, Iran.
چکیده [English]

The quality of surface waters has changed under the influence of a number of human factors to such an extent that rendered it impossible to remove pollution by only using natural filtration and purification processes. Due to their different levels of tolerance, benthic macroinvertebrates are often used as bioindicators of water quality. The present study mainly intended to examine water quality at Karaj River using benthic macroinvertebrate populations. In fall (2018) and spring (2019), the benthic macroinvertebrate populations in the river were sampled at 10 stations using Surber samplers with net mesh size of 250 ηm. We identified a total number of 7985 samples which came from 10 orders and 38 families. In fall, the greatest frequency of occurrence was that of the family Baetidae (35.6%) while the family Chironomidae had the highest frequency of occurrence (53.5%) in spring. The findings indicated different qualities at different sampling stations. None of the stations in fall were assigned into the poor quality category; however, in spring, the stations Varangeh Rud, Do-Ab, Haft Cheshmeh, Kojur, and Aderan were classified as having poor and bad qualities based on EPT and HFBI indicators. The findings suggested that water quality of Karaj River was relatively good in fall yet exhibited a drop in quality in spring. In addition, the findings of the present study also highlighted the importance of using bioindicators in determining water quality.

کلیدواژه‌ها [English]

  • benthic macroinvertebrate
  • changes in water quality
  • Karaj River
  • bioindicator

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مجله بهره برداری و پرورش آبزیان
دوره 13، شماره 4
دی 1403
صفحه 227-242

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