بررسی برخی پارامترهای پویایی جمعیت خرچنگ (Pretzmann, 1971) Austruca iranica در سواحل شمالی جزیره قشم

نوع مقاله : مقاله کامل علمی - پژوهشی

نویسندگان

1 دانشجوی کارشناسی‌ارشد گروه شیلات، دانشکده شیلات و محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران.

2 استاد گروه شیلات، دانشکده شیلات و محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران

3 دانشیار گروه شیلات، دانشکده شیلات و محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران.

4 نویسنده مسئول، استادیار گروه شیلات، دانشکده شیلات و محیط زیست، دانشگاه علوم کشاورزی و منابع طبیعی گرگان، گرگان، ایران.

5 استادیار گروه کشاورزی، دانشگاه پیام‌نور، تهران، ایران

چکیده

هدف از مطالعه حاضر بررسی برخی پارامترهای پویایی جمعیت خرچنگ Austruca iranica در سواحل شمالی جزیره قشم از بهمن 1397 تا دی 1398 بود. از مجموع 551 نمونه خرچنگ گرفته شده (327 عدد نر و 224 عدد ماده) نسبت جنسی 5/1:1 به‌دست آمد (01/0 P<). حداقل، حداکثر و میانگین عرض کاراپاس (±انحراف معیار) برای جنس نر 89/1، 04/17 و 34/2 ± 9/10 میلی‌متر و برای جنس ماده 56/3، 59/16 و 36/2 ± 61/10 میلی‌متر بدست آمد. همچنین میانگین وزنی (±انحراف معیار) خرچنگ‌های نر و ماده به ترتیب 65/0 ± 86/0 (با دامنه 72/2-009/0) و 32/0 ± 58/0 (با دامنه 97/1-02/0) گرم محاسبه شد. رابطه عرض کاراپاس-وزن بدن برای جنس نر W=0.0005CW^2.98 و برای جنس ماده W=0.0009CW^2.69 به‌دست آمد. خرچنگ‌های نر و ماده به ترتیب دارای الگوی رشد ایزومتریک و آلومتریک منفی بودند. پارامترهای معادله رشد وان برتالنفی به صورت 58/22= CW∞ میلی‌متر، 79/0=k در سال و 22/0-= t0 سال برآورد شد. نرخ مرگ و میر کل و حداکثر طول عمر به ترتیب 64/3 در سال و 6/3 سال به‌دست آمد. کمترین، بیشترین و میانگین (±انحراف معیار) میزان هم‌آوری به ترتیب 2953، 15038 و 3515 ± 7946 عدد تخم شمارش گردید. اندازه عرض کاراپاس ماده‌ها در زمان بلوغ جنسی 7/9 میلیمتر برآورد شد. نتایج بدست آمده به شناخت بهتر ویژگی‌های زیستی این گونه در جهت حفظ آن کمک خواهد کرد. همچنین با توجه به ارزش اکولوژیک بالای این گونه و نقش آن در زنجیره غذایی، از اطلاعات پایه بدست آمده می-توان در مدیریت ماهیگیری با رویکرد اکوسیستم محور استفاده کرد.

کلیدواژه‌ها

عنوان مقاله [English]

Study on some of population dynamics parameters of Austruca iranica (Pretzmann, 1971) in the northern coastline of Qeshm Island

نویسندگان [English]

  • Zainab Hajiyani Nazhad 1
  • Rasoul Ghorbani 2
  • Seyed Aliakbar Hedayati 3
  • Parviz Zare 4
  • Mojtaba Naderi 5
1 . M.Sc. Student, Dept. of Fisheries, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
2 Professor, Dept. of Fisheries, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
3 Associate Prof., Dept. of Fisheries, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran
4 Corresponding Author, Assistant Prof., Dept. of Fisheries, Faculty of Fisheries and Environmental Sciences, Gorgan University of Agricultural Sciences and Natural Resources, Gorgan, Iran.
5 Assistant Prof., Dept. of Agriculture, Payame Noor University (PNU), Tehran, Iran
چکیده [English]

The present study aimed to investigate some population dynamics parameters of Austruca iranica on northern beaches of Qeshm Island from February 2019 to January 2020. Of the 551 specimens examined (327 males and 224 females), the overall sex ratio (m/f=1.5 obtained. ( p<0.01). The minimum, maximum, average carapace width (±SD) obtained 1.89, 17.04 and 10.9 ± 2.34 mm for males and 3.56, 16.59 and 10.61 ± 2.36 mm for the females. The average weight (±SD) of male and female crabs was calculated 0.86 ± 0.65 g (with a range of 0.009-2.72 g) and 0.58 ± 0.32 g (with a range of 0.02-1.97 g), respectively. The carapace width-body mass relationship was estimated W=0.0005CW^2.98 for males and W=0.0009CW^2.69 for females. The male and females crabs showed isometric growth pattern and negative allometric pattern, respectively. The estimated growth parameters were 〖CW〗_∞=22.58 mm, k=0.79 year-1 and t_0=-0.22 year-1. Total mortality rate and maximum life span were calculated 3.64 year-1 and 3.6 years, respectively. The minimum, maximum and average (±SD) fecundity were 7946, 2953 and 15038 eggs, respectively. Size at the onset of maturity was 9.7 mm based on carapace width in females. The results will help to better understand the biological characteristics of this species in order to conserve it. Additionally, due to the high ecological value of this species and its role in the food chain, the basic information obtained can be used in ecosystem-based fisheries management.

کلیدواژه‌ها [English]

  • Austruca iranica
  • ؛ Qeshm Island؛ Population dynamics parameters

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مجله بهره برداری و پرورش آبزیان
دوره 11، شماره 3
مهر 1401
صفحه 13-28

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