بررسی اثر سد شهید رجایی بر تنوع و تمایز ریخت سنجی و شمارشی ماهی خیاطه (Alburnoides sp.) (Pisces: Cyprinidae) در رودخانه تجن ساری

نویسندگان

1 گروه شیلات، دانشکده منابع طبیعی، دانشگاه گیلان، صندوق پستی:1144

2 گروه شیلات، دانشکده علوم دام و شیلات، دانشگاه کشاورزی و منابع طبیعی ساری، صندوق پستی: 578

3 گروه شیلات، دانشکده علوم دام وشیلات، دانشگاه کشاورزی و منابع طبیعی ساری، صندوق پستی: ۵۷۸

چکیده

این مطالعه به‌ منظور بررسی تنوع و تمایز ماهی خیاطه رودخانه تجن ساری در بالادست و پایین‌ دست سد شهید رجایی انجام شده است. در مجموع تعداد 100 قطعه ماهی (50 قطعه یستگاه بالادست و 50 قطعه ایستگاه پایین ‌دست سد) توسط دستگاه الکتروشوکر صید گردیدند. 53 صفت ریخت‌ سنجی توسط کولیس دیجیتالی و 16 صفت شمارشی در این نمونه‌ ها اندازه‌ گیری گردید. برای تجزیه و تحلیل داده ‌های ریخت ‌سنجی استاندارد شده و شمارشی از آنالیز تجزیه به مولفه ‌های اصلی (PCA)، آنالیز تابع متمایز کننده (DFA) و آنالیز کلاستر استفاده گردید. نتایج حاصل از تحلیل واریانس یک طرفه برای ویژگی‌ های ریخت ‌سنجی استاندارد شده، 25 ویژگی در بین ایستگاه ‌ها تفاوت معنی‌ داری داشت (P<0/05) که نشان‌دهنده تنوع به نسبت زیاد فنوتیپی در جمعیت ماهیان خیاطه دو منطقه مورد بررسی است. نتایج DFA نشان داد که جمعیت ماهیان دو ایستگاه در صفات ریخت‌ سنجی %93 و صفات شمارشی %78 از یکدیگر انشقاق یافته‌ اند. نتایج آنالیز PCA در دو ایستگاه نشان داد که در صفات ریخت‌ سنجی 8 فاکتور و در صفات شمارشی 6 فاکتور انتخاب شدند. دندروگرام UPGMA براساس فاصله اقلیدسی نیز، جمعیت ایستگاه ‌های بالادست و پایین ‌دست سد را از یکدیگر متمایز نمود. 

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of dam effect of Shahid-Rajaei on variation and differentiation of spirlin (Alburnoides sp.) (Pisces: Cyprinidae) in the Tajan River (Iran)

نویسندگان [English]

  • Fahime Azizi 1
  • Majidreza Khoshkholgh 1
  • Hossein Rahmani 2
  • Masoud Sattari 1
  • Hossein Anvarifar 3
1 Dept. of Fisheries, Faculty of Natural Resources, University of Guilan, P.O. Box: 1144
2 Dept. of Fisheries, Faculty of Animal sciences and Fisheries, University of Agriculture sciences and Natural Resources of Sari, P.O. Box: 578, Mazandaran, Iran
3 Dept. of Fisheries, Faculty of Animal sciences and Fisheries, University of Agriculture sciences and Natural Resources of Sari, P.O. Box: 578, Mazandaran, Iran
چکیده [English]

Effects of Shaheed Rajaee Dam constructed on the Tajan River on diversity and separation of Spirlin (Alburnides sp.) population was studied. Total of 100 fish samples including 50 samples from either side (below and above) of the dam were caught by electrofishing gear and examined. 53 morphometric were measured with the aid of digital clipper and 16 meristic (numerical) characteristics were also determined in all samples. Principal component (PCA) and detrended fluctuation (DFA) and cluster analyses were used to examine morphometric and meristic (numerical) data following standardization (to avoid error related to alometric growth). The one- way ANOVA analysis for standardized morphometric traits revealed statistically significant differences in 27 parameters within specimens which show relatively high phenotype diversity in A. bipunctatus from two studies areas. The DFA analysis showed that fish population in two areas below and above the dam are separated by 93% in morphometric and 78% in meristic characteristics. The PCA analysis also showed that 8 morphometric and 6 meristic characteristic separate fish populations of the river below and above the dam. The dendrogram constructed by UPGMA based on Euclidean distance coefficient also separated the fish population upstream and downstream of the dam.  

کلیدواژه‌ها [English]

  • Spirlin
  • Morphometric and meristic
  • Diversity
  • Separation
  • Tajan River
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