مقایسة تجمع ‌زیستی فلزات سنگین روی (Zn) و کروم (Cr) در اندام‌های داخلی ماسل آب شیرین Anodonta cygnea (Bivalvia: Unionidae)

نوع مقاله: مقاله پژوهشی


1 کارشناس ارشد اکولوژی آبزیان شیلاتی، گروه شیلات، دانشکدة منابع طبیعی، دانشگاه تهران

2 دانشیار گروه شیلات، دانشکدة منابع طبیعی، دانشگاه تهران

3 استادیار گروه شیلات، دانشکدة منابع طبیعی، دانشگاه تهران


امروزه از دوکفه‏ای‏ها به‌وفور در مطالعات در زمینة پایش آلودگی فلزات سنگین در محیط‏های آبی استفاده می‏شود. هدف از این مطالعه، بررسی تجمع ‌زیستی فلزات سنگین روی (Zn) و کروم (Cr) در اندام‏های مختلف دوکفه‏ای Anodonta cygneaبود. بدین منظور، 42 نمونة برداشت‌شدة این دوکفه‏ای از منطقة سمسکندة ساری در محیط‏ آزمایشگاه با غلظت µg l-1125 فلزات به صورت جداگانه در یک دورة 27 روزه مواجهه داده شدند. سطوح مبنا، میزان تجمع و مقادیر ∆C/C0 هر دو فلز در اندام‏های جبه، آبشش، هپاتوپانکراس و پا در طول دورة مطالعه اندازه‏گیری شد. سطوح پایة فلز روی به صورت معنا‏داری بالاتر از سطوح پایة کروم بود (01/0 > P). تفاوتی در مقادیر پایة روی در اندام‏های مختلف مشاهده نشد، اما سطوح پایة کروم در اندام‏ها متفاوت بود (آبشش > هپاتوپانکراس ≈ پا > جبه). بیشترین میزان تجمع هر دو فلز در طول دورة مواجهه مربوط به اندام‏های آبشش و هپاتوپانکراس و کمترین مقدار تجمع نیز متعلق به جبه بود. نسبت‏های ∆C/C0 محاسبه‌شده در همۀ اندام‏ها برای فلز کروم به صورت معنا‏داری (01/0 > p) بیشتر از روی بود و ترتیب مقادیر آن برای دو فلز عبارت بود از: Zn: هپاتوپانکراس > پا > جبه > آبشش؛ Cr : جبه > هپاتوپانکراس ≈ پا > آبشش. با توجه به نتایج این مطالعه، دوکفه‏ای A.cygneaبه‌منزلة یک شاخص زیستی آلودگی فلزات روی و کروم در محیط‏های آب شیرین پیشنهاد می‏شود.


عنوان مقاله [English]

Comparison of zinc and chromium bioaccumulation in the internal organs of freshwater mussel Anodonta cygnea (Bivalvia: Unionidae)

نویسندگان [English]

  • Fateh Moezzi 1
  • Arash Javanshir 2
  • Soheil Eagderi 3
  • Hadi Poorbagher 3
2 Associate professor, department of fisheries, faculty of natural resources, university of Tehran, Iran
3 Assistant professor, department of fisheries, faculty of natural resources, university of Tehran, Iran
چکیده [English]

Nowadays, bivalves are used in monitoring levels of heavy metals in aquatic environments. The aim of this study was to investigate bioaccumulation of heavy metals zinc (Zn) and chromium (Cr) in the internal organs of Anodonta cygnea. For this purpose, bivalve specimens were collected from Semeskandeh region, Sari, and then in laboratory, were exposed to 125 µg l-1 concentrations of each metal for 27 days. Basal levels, accumulated amounts and ΔC/C0 of both metals in mantle, gill, hepatopancreas and foot of the mussel during study period were measured. Zn basal levels in all studied organs were significantly (P < 0/01) higher than Cr. There were no difference in Zn basal levels between different organs, but for the case of Cr, basal levels were different: gill > hepatopancreas ≈ foot > mantle. Highest accumulation of both metals were observed in gill and hepatopancreas and minimum accumulation were belonged to the mantle. Calculated ratios of ΔC/C0 for Cr were significantly (P < 0/01) higher than Zn in all studied organs: Zn: hepatopancreas > foot > mantle > gill; Cr: mantle > hepatopancreas ≈ foot > gill. Based on our results, it can be said that A. cygnea, is a good species for biomonitoring Zn and Cr levels in aquatic ecosystems.

کلیدواژه‌ها [English]

  • "Aquatic environments"
  • "Bivalves"
  • "Heavy metal"
  • "Bioaccumulation"
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