نشریه محیط زیست طبیعی

اثرات میکروپلاستیک پلی‌استایرن بر تکامل جنین ماهی زبرا (Danio rerioHamilton, 1822)

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه شیلات، دانشکدة منابع طبیعی، دانشگاه تهران،کرج، ایران.

10.22059/jne.2024.370483.2635

چکیده

آلودگی میکروپلاستیک ­ها در سراسر جهان روز‌به‌روز در حال افزایش است و این پتانسیل را دارد که اثرات منفی بر اکوسیستم‌های آبی و آبزیان بگذارند. با وجود گزارش ­های علمی زیاد در خصوص وجود میکروپلاستیک ­ها در اکوسیستم­ های آبی اطلاعات کمی در مورد سمیت آن‌ها در مراحل اولیة زندگی آبزیان وجود دارد. این مطالعه با هدف ارزیابی اثرات میکروپلاستیک پلی ­استایرن بر تکامل جنین در ماهی زبرا (Danio rerio) انجام گردید. در این مطالعه مولدین ماهی زبرا در دو دورة 21 و 60 روز در معرض غلظت­ های مختلف (صفر (شاهد)، 20، 200، 2000 میکروگرم بر لیتر) میکروپلاستیک پلی­استایرن قرار گرفتند. بعد از پایان هر دوره و تخمریزی ماهیان، تغییرات زمانی و روند رشد جنین بررسی شد. نتایج نشان داد که این میکروپلاستیک بعد از 21 روز در تیمارهای 20 و 200 میکروگرم بر لیتر نسبت به تیمار شاهد اثر معنی­داری بر مدت زمان تخم­گشایی و تکامل جنین نداشت، اما در تیمار 2000 میکروگرم بر لیتر اختلاف معنی ­داری (0/05>P) با تیمار شاهد مشاهده شد و مدت زمان تخم­گشایی 8 ساعت به تعویق افتاد. بعد از 60 روز در تیمارهای 200 و 2000 میکروگرم بر لیتر اختلاف معنی­داری با تیمار شاهد مشاهده شد و مدت زمان تخم­گشایی به‌ترتیب 10 و 6 ساعت به تعویق افتاده و مراحل رشد جنین دیرتر طی شد. به‌طور کلی می­توان نتیجه گرفت که تیمارهایی که مدت زمان بیشتر و با غلظت بالاتری در معرض میکروپلاستیک پلی ­استایرن قرار گرفتند مراحل رشد جنین را آهسته ­تر طی کرده و نسبت به تیمار شاهد دیرتر تفریخ می­ شوند. بنابراین، بررسی‌های بیشتر و نظارت بر آلودگی میکروپلاستیک­ها در اکوسیستم‌های آبی برای جلوگیری از عواقب بلند مدت آن‌ها بر جمعیت آبزیان مورد نیاز خواهد بود.

کلیدواژه‌ها

عنوان مقاله [English]

The effects of polystyrene microplastics on embryo development in Zebra danio (Danio rerio Hamilton, 1822)

نویسندگان [English]

  • Jamal Rahimi
  • Kamran Rezaei Tavabe
  • Bagher Mojazi Amiri
  • Arash Javanshir Khoei

Department of Fisheries, Faculty of Natural Resources, University of Tehran, Karaj, Iran.

چکیده [English]

The pollution of microplastics is increasing worldwide, and they have the potential to have negative effects on aquatic ecosystems and aquatic organisms. Although there are many scientific reports on the presence of microplastics in aquatic ecosystems, little is known about their toxicity during the early stages of aquatic life. This study was conducted to evaluate the effects of polystyrene microplastics on embryo development in Zebra danio (Danio rerio). In this study, zebrafish broodstock was exposed to different concentrations (0 (control), 20, 200, 2000 μg/l) of polystyrene microplastics in two periods of 21 and 60 days. After each period and fish spawning, time changes, and the development process of embryos were investigated. According to the findings, after 21 days in the treatments of 20 and 200 μg/l, this particular type of microplastic did not have any significant impact on the duration of egg hatching and embryo development. However, in the treatment of 2000 μg/l, there was a significant difference (P<0.05) compared to the control treatment. Specifically, it was observed that the hatching time was delayed by 8 hours. After 60 days, significant differences were observed in the treatments of 200 and 2000 μg/l when compared to the control treatment. The hatching time of the embryos was delayed by 10 and 6 hours, respectively. Overall, it can be inferred that the embryos exposed to higher concentrations and longer durations of polystyrene microplastics exhibited slower growth stages and later hatching compared to the control treatment. Therefore, to prevent long-term consequences for aquatic populations, more research and monitoring of microplastic pollution in aquatic ecosystems will be necessary.

کلیدواژه‌ها [English]

  • Aquatic ecosystems
  • Embryo development
  • Microplastics
  • Polystyrene
  • Zebrafish
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نشریه محیط زیست طبیعی
دوره 77، ویژه نامه بوم شناسی و مدیریت تنوع زیستی
مرداد 1403
صفحه 153-161