بررسی جدایی تولید‌مثلی در جمعیت‌های آنوستراکای آب شیرین (Crustacea: Anostraca) Branchinecta orientalis

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه اکولوژی و مدیریت ذخایر آبی، پژوهشکدة آرتمیا و آبزی‌پروری، دانشگاه ارومیه، ارومیه، ایران.

2 گروه زیست‌شناسی، دانشکدة علوم، دانشگاه ارومیه، ارومیه، ایران.

10.22059/jne.2024.375308.2659

چکیده

این تحقیق جدایی تولیدمثلی جمعیت‌هایBranchinecta orientalis  از سه زیستگاه متفاوت در منطقة آذربایجان، ایران مورد بررسی قرار داده است. تخم‌های جمع‌آوری شده‌ی آنوستراکا جهت بررسی‌های زیست‌سنجی و آمیخته‌گری مورد آزمایش قرار گرفتند. براساس نتایج به‌دست آمده اندازة تخم‌های  هیدراته، تخم‌های پوسته‌زدایی شده و ضخامت لایة کوریونی تخم‌ها در زیستگاه آیقرگل (AIG) بزرگتر از سایر گروه‌ها بود. درصد تخم‌گشایی در تخم‌های حاصل از جمعیت‌های آمیخته‌گری شده در مقایسه با جمعیت‌های خالص کاهش معنی‌داری نشان داد (0/05>P). کمترین میزان تخم‌گشایی در تخم‌های تولید شده توسط جمعیت آیقرگل (AIG) مشاهده گردید (1/7±8/99). همچنین میزان مرگ و میر ناپلی‌های تازه هچ شده حاصل از جمعیت‌های آمیخته‌گری شده به‌طور معنی داری بیشتر از سایر نمونه‌های مورد بررسی بود (05/0>P). به‌طوری‌که بیشترین مرگ و میر زود هنگام در گروه (L) AIG-KAS (%8/27±2/87) و کمترین میزان در گروه (F) KHS مشاهده شد. میزان رشد متعلق به جمعیت‌های مختلف تقریباً یکسان بود و هیچ تفاوت معنی‌داری  بین آن‌ها در پایان دورة پرورش جمعیت مشاهده نشد (0/05<P). به‌طور کلی می‌توان نتیجه گرفت که تفاوت در عملکرد تولید‌مثلی جمعیت‌های B.orientalis ناشی از جدایی تولید‌مثلی نسبی می‌باشد که در اثر جدایی جغرافیایی و سازش با محیط رخ داده است.

کلیدواژه‌ها

عنوان مقاله [English]

Investigating reproductive isolation in freshwater Anostraca populations Branchinecta orientalis (Crustacea: Anostraca)

نویسندگان [English]

  • Behrooz Atashbar Kangarloei 1
  • Ahmad Mahmoudi 2

1 Department of Ecology and Resource Assessment, Artemia and Aquatic Research Institute, Urmia University, Iran.

2 Department of Biology, Faculty of Sciences, Urmia University, Urmia, Iran.

چکیده [English]

This research investigated the reproductive isolation of Branchinecta orientalis populations from three different geographical locations in Azerbaijan, Iran. The collected eggs of Anostraca were tested for biometry and hybridization studies. Based on the obtained results, the diameter of hydrated cysts, the diameter of decapsulated cysts and the chorion thickness of eggs in the Aigher Goli (AIG) habitat were observed to be larger than other groups. The percentage of hatching in the eggs obtained from crossbreed populations showed a significant decrease compared to pure populations (P<0.05). The lowest hatching rate was observed in the eggs produced by the AIG population (8.99±1.70). Also, the mortality rate of newly hatched nauplius from crossbreed populations was significantly higher than other studied samples (P>0.05). Thus, the highest early mortality was observed in AIG-KAS(L) (%8.27±2.87) and the lowest in KHS(F). The growth rates of different populations were almost the same and no significant difference was observed between them at the end of the breeding period (P>0.05). In general, it can be concluded that the difference in reproductive performance among B. orientalis populations is due to relative reproductive isolation due to geographic isolation and environmental adaptation.

کلیدواژه‌ها [English]

  • Adaptation
  • Crossbreeding
  • Geographic isolation
  • Reproductive isolation
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