تعیین شاخص‎ های تنوع زیستی تحت شرایط پرورش در قفس قزل ‏آلای رنگین‏ کمان (Oncorhynchus mykiss) در منطقه عباس ‏آباد، جنوب دریای خزر

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه شیلات، دانشکده منابع‎ طبیعی دریا، دانشگاه علوم و فنون دریایی خرمشهر، خرمشهر، ایران

2 گروه شیلات، دانشکده منابع ‎طبیعی دریا، دانشگاه علوم و فنون دریایی خرمشهر، خرمشهر، ایران

3 پژوهشکده اکولوژی آبزیان دریای خزر، موسسه تحقیقات علوم شیلاتی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، ساری، ایران

چکیده

این تحقیق با هدف تعیین اثر احتمالی فعالیت پرورش قزل آلای رنگین‎ کمان در قفس بر شاخص‎ های تنوع جوامع زیستی آب های ساحلی منطقه عباس آباد (حوضه جنوبی دریای خزر) طراحی گردید. نمونه های جوامع زیستی (بزرگ بی‌ مهرگان کفزی، فیتوپلانکتون و زئوپلانکتون) از فواصل 5، 50، 100 و 1000 متری از قفس های پرورش ماهی طی 4 دوره شامل ماه های دی (قبل از پرورش) و اسفند 1393 و ماه های اردیبهشت (دوره پرورش) و مرداد 1394 (بعد از دوره پرورش) جمع آوری شدند. در این تحقیق 9 گروه بزرگ بی­ مهرگان کفزی (با غالبیت رده پرتاران، Streblospio gynobranchiata وHypaniola kowalewskii) و 42 گونه‏ فیتوپلانکتون متعلق به پنج شاخه با غالبیت شاخه‏‏ Bacillariophyta شناسایی گردید. هم­ چنین 10 گروه از زئوپلانکتون­ ها نیز شناسایی شد که گونه ‎ Acartia tonsaاز راسته پاروپایان جمعیت غالب را تشکیل داد. نتایج نشان داد که پراکنش و فراوانی جوامع زیستی به طور معنی دار تحت تأثیر تغییرات فصلی بود (0/05>p )، درحالی‏ که اثر فاصله از مرکز قفس روی آن ها معنی‌ دار نبود (0/05<p ) و در بیش ­تر موارد تغییرات هیچ کدام از شاخص های تنوع زیستی تحت تأثیر فعالیت پرورش ماهی در قفس قرار نگرفت. به نظر می‌ رسد که فعالیت پرورش در قفس قزل آلای رنگین کمان در منطقه عباس آباد، به دلیل تراکم پائین ماهی، کوتاه بودن طول دوره پرورش و جریان های آبی قوی اثر قابل ملاحظه ای روی جوامع زیستی محیط اطراف قفس نداشت به طوری که، تغییرات مشاهده شده در شاخص های تنوع زیستی بیش­ تر با تغییرات فصلی مرتبط بود.

کلیدواژه‌ها


عنوان مقاله [English]

Determination of the biodiversity indicators under cage culture of rainbow trout conditions in the Abbas Abad area, southern basin of the Caspian Sea

نویسندگان [English]

  • Erfan Karimian 1
  • Mohammad Zakeri 2
  • Seyed Mohammad Vahid Farabi 3
  • Mahsa Haqi 1
  • Preeta Kochanian 1
1 Department of Fisheries, Faculty of Marine Natural Resources, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran
2 Department of Fisheries, Faculty of Marine Natural Resources, Khorramshahr University of Marine Science and Technology, Khorramshahr, Iran
3 Caspian Sea Ecology Research Center, Iranian Fisheries Science Research Institute, Agricultural Research Education and Extension Organization (AREEO), Sari, Iran
چکیده [English]

This study was designed to determine the probable effect of rainbow trout cage culture on the biodiversity indicators in the Abbas Abad area, southern basin of the Caspian Sea. For this purpose, biological samples (benthic macro invertebrates, phytoplankton and zooplankton) were collected at distance of 5, 50, 100 and 1000 m from the cages in December 2014 (before the culture period), March and April (production period) and August 2015 (after the culture period). In this study, 9 taxa of benthic macro invertebrates (with the dominance of polychaetes; Streblospio gynobranchiata and Hypaniola kowalewskii) and 42 species of phytoplankton belonging to five phyla (with the dominance of Bacillariophyta) were identified. A total of 10 taxa of zooplanktons were identified with the copepod; Acartia tonsa being the dominant taxa as well. The results showed that the distribution and abundance of biological community were significantly affected by the seasons (p < 0.05) where as it was not affected by the distance from the cages (P>0.05) and in most cases, changes of biodiversity indicators were not affected by cage culture activity. It seems that the rainbow trout cage culture in the Abbas Abad region no remarkable effect on the biodiversity indicators in the vicinity of small scale fish cages due to short duration of cage culture and strong water currents, so that observed changes were more associated with seasonal fluctuant.

کلیدواژه‌ها [English]

  • Cage culture
  • rainbow trout
  • Biodiversity indicators
  • southern of the Caspian Sea
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