مجله علوم آبزی پروری

مجله علوم آبزی پروری

اثر پساب مزارع پرورش ماهی قزل‌آلای رنگین‌کمان (Oncorhynchus mykiss) بر شاخص‌های تنوع جمعیت بزرگ بی‌مهرگان کفزی، مطالعه موردی رودخانه آزاد سنندج

نوع مقاله : مقاله پژوهشی

نویسنده
گروه شیلات، دانشکده منابع طبیعی، دانشگاه کردستان، سنندج، ایران.
چکیده
هدف از این مطالعه بررسی اثرات ورود پساب حاصل از مزارع پرورش ماهی بر جمعیت بزرگ بی‌مهرگان کفزی رودخانه آزاد سنندج بود. بدین‌منظور نمونه‌برداری طی 3 دوره نمونه‏برداری در فصل بهار (پرورش با تراکم کم)، تابستان (تراکم زیاد) و پاییز (تراکم متوسط) 1401 در 3 ایستگاه شامل 1) ایستگاه بالادست یا شاهد، 2) خروجی پساب مزرعه و 3) فاصله 650 متری بعد از مزرعه پرورش ماهی انجام شد. در تعیین نتایج بررسی شاخص‌های تنوع نشان داده شد که میزان شاخص تنوع شانون در ایستگاه 2 دارای بیشترین (1/41) و ایستگاه 1 دارای کم‌ترین میزان (0/99) بود (0/05>P) اما بین فصول مختلف تفاوت معنی‌دار مشاهده نشد. اما با تعیین شاخص مارگالف مشاهده شد که میزان آن در ایستگاه 3 دارای بیشترین (1/35) و ایستگاه 1 دارای کم‌ترین مقدار (0/99) بود که این تفاوت فقط بین ایستگاه 3 و 1 معنی‌دار بود. اما، افزایش معنی‌دار شاخص سیمپسون در ایستگاه 1 (0/47) و کم‌ترین در ایستگاه‌های 2 و 3 به‌دست آمد. به‌طور کلی، در مطالعه حاضر مقادیر شاخص‌های ساختار جمعیت در ایستگاه‌های پایین‌دست به‌خصوص ایستگاه 3 افزایشی بود (0/05>P) که این نتیجه می‌تواند نشان‌دهنده عدم اثرات نامطلوب پساب مزرعه پرورش ماهی روی شاخص‌های مورد بررسی در شرایط مطالعه حاضر باشد اگرچه افزایش شاخص‌های تنوع، بیشتر ناشی از افزایش تنوع گروه‌های مقاوم به آلودگی بود. با توجه به مشاهده اثر معنی‌دار روی برخی عوامل فیزیکوشیمیایی پیشنهاد می‌گردد برای تعیین دقیق اثرات آبزی‌پروری، عوامل زیستی و غیرزیستی همزمان بررسی شود.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

The effect of rainbow trout (Oncorhynchus mykiss) fish farm effluent on diversity indices of benthic macroinvertebrates, A case study of Azad River, Sanandaj

نویسنده English

Erfan Karimian
Department of Fisheries, Faculty of Natural Resources, University of Kurdistan, Sananndaj, Iran.
چکیده English

The aim of this study was to investigate the effects of fish farm effluent discharge on the benthic macroinvertebrate communities of the Azad River in Sanandaj. Sampling was conducted during 3 sampling periods in spring (low density farming), summer (high density), and autumn (medium density) 2023 at three stations including 1) the upstream or control station, 2) the farm effluent outlet, and 3) from distance of 650 meters after the fish farm. The results of the biodiversity indices showed that the Shannon index value was the highest (1.41 and the lowest (0.99)) at station 2 and 1 respectively (P<0.05). However, by determining the Margalef index, it was observed that its value was the highest (1.35) at station 3 and the lowest (0.99) at station 1, and this difference was significant only between stations 3 and 1. However, a significant increase in the Simpson index was obtained at station 1 (0.47) and the lowest at stations 2 and 3. Overall, In the present study, the values ​​of population structure indices at downstream stations particularly Station 3 showed an increase (P<0.05), This suggests that, under the conditions of the present study, fish farm effluent did not exert adverse effects on the examined indices, although the increase in diversity indices was primarily driven by a rise in the diversity of pollution-tolerant groups. Given the observed significant impact on certain physicochemical parameters, it is recommended that both biotic and abiotic factors be examined simultaneously to precisely determine the effects of aquaculture activities.

کلیدواژه‌ها English

;">Diversity indices, ;">Effluent, ;">Benthos, ;">Azad River, ;">Sanandaj.
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انتشار آنلاین از 30 شهریور 1405