دوره 14، شماره 4 - ( 11-1403 )
جلد 14 شماره 4 صفحات 11-1 |
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Danaei A, Patimar R, Raeisi H, kordjazi Z, Fazel A. Spatio-temporal Variability of Some Population Dynamics Parameters of the Caspian kutum, Rutilus frisii (Nordmann, 1840) in the Coastal Waters of Golestan Province (Southeast Caspian Sea). J. Aqua. Eco 2025; 14 (4) :1-11
URL: http://jae.hormozgan.ac.ir/article-1-1130-fa.html
URL: http://jae.hormozgan.ac.ir/article-1-1130-fa.html
دانائی امین، پاتیمار رحمان، رئیسی هادی، کردجزی ضیاء، فاضل عبدالعظیم. تنوع‌پذیری زمانی-مکانی برخی پارامترهای پویایی جمعیت ماهی سفید Rutilus frisii (Nordmann, 1840) در آبهای ساحلی استان گلستان (جنوب شرقی دریای خزر). مجله بوم شناسی آبزیان. 1403; 14 (4) :1-11
چکیده: (175 مشاهده)
مطالعه حاضر باهدف بررسی تنوع بین جمعیتی پویایی جمعیت ماهی سفید دریای خزر (Rutilus frisii) بر اساس دادههای صید در آبهای ساحلی استان گلستان (جنوب شرقی دریای خزر) طی 26 سال (1395 – 1370) انجام شد. در این پژوهش، دادههای بیومتری 20438 نمونه ماهی سفید به تفکیک زمان (سال) مورد بررسی قرار گرفت. بزرگ‌ترین نمونه دارای 70 سانتیمتر بود. میانگین کل مقادیر L∞ و k به ترتیب 5/45 ± 59.83 سانتیمتر0.5 ± 0.44 در سال بدست آمد. مقدار وزن بینهایت (W∞) از 1738.97 تا 6380.03 گرم متغیر و دارای میانگین 942.6± 2867.96 گرم بود. آنالیز گروه‌های سنی همسان (کوهورت) نشان داد که جمعیت تحت بهره‌برداری از پنج کوهورت تشکیل شده است. کمترین و بیشترین ضریب مرگ‌ومیر طبیعی بین0.6 و 0.84 بدست آمد. میانگین ضریب مرگ‌ومیر کل نیز 1.35 برآورد گردید. ضریب بهره‌برداری (E) از0.13 تا 0.73 متغیر بود که در مدت 8 سال این ضریب بالا‌تر از 0/5 بدست آمد. نتایج نشان دادکه پارامترهای جمعیتی ماهی سفید (R. frisii) دارای پویایی قابل‌ملاحظه زمانی (بین سال‌ها) میباشد. این پویایی نشان‌دهنده تنوع بین جمعیتی این گونه است.
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