بررسی دوریختی جنسی با استفاده از صفات اندازشی در خرچنگ ماه Matuta victor (Fabricius, 1781)، در ساحل گهردو، دریای عمان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه کشاورزی، دانشگاه پیام نور، تهران، ایران

2 گروه زیست شناسی، دانشگاه پیام نور، تهران، ایران

10.22034/AEJ.2021.295105.2583

چکیده

این مطالعه به صورت ماهیانه از آذرماه ماه 1398 تا آبان ماه 1399 در سواحل شنی منطقه گهردو واقع در جنوب غربی شهرستان سیریک با استفاده از تور به صورت تصادفی انجام شد. در مجموع 310 عدد خرچنگ Matita victor جمع‌آوری شد. از این تعداد، 181 عدد جنس نر و 129 عدد جنس ماده تشخیص داده شد. دامنه پهنای کاراپاس خرچنگ‌های نر و ماده به ترتیب 44/3-16/4 و 36/9-19/3 میلی‌متر به دست آمد. هم چنین دامنه وزنی برای خرچنگ‌های نر و ماده به ترتیب 37/88-1/75 و 16/79-3/22 گرم اندازه‌گیری شد. در این مطالعه بیش ترین خرچنگ نر و ماده صید شده به ترتیب در دامنه طولی 23/2-19/8 و در دامنه طولی 30-26/6 میلی‌متر مشاهده شد. در دو دامنه طولی 43/6-40/2 و 47-43/6 میلی‌متر هیچ خرچنگ ماده‌ای صید نشد. نوع رشد در جنس نر به‌صورت آلومتریک مثبت برآورد شد درحالی‌که جنس ماده دارای رشد آلومتریک منفی بود. مقدار b در جنس نر (3/11) به‌طور معنی‌داری بیش تر از جنس ماده (2/75) به دست آمد (0/05>p). آنالیز شیب رگرسیون رشد نسبی بین دو پارامتر طول و پهنای کاراپاس بیانگر تفاوت معنی‌داری بین دو جنس نر و ماده بود. از بین پارامترهای مورد بررسی نسبت میانگین پهنای سینه، میانگین فاصله بین دوخار، میانگین پهنای اولین بند آبدمن (شکم) به طور معنی‌داری در جنس ماده بیش تر بود (0/05>p). از طرف دیگر نسبت میانگین طول چنگک بزرگ در جنس نر به طور معنی‌داری بیش تر بود (0/05>p). نتایج حاصل از این مطالعه می‌تواند برای حفاظت این گونه با هدف حفظ تنوع زیستی مفید باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Study of sexual dimorphism in morphometric characters of the moon crab Matuta victor (Fabricius, 1781) in Gehrdo coast, Oman Sea

نویسندگان [English]

  • Mojtaba Naderi 1
  • Mina Mahigir 2
1 Department of Agriculture, Payame Noor University (PNU), Tehran, Iran
2 Department of Biology, Payame Noor University (PNU), Tehran, Iran
چکیده [English]

This study was done monthly on sandy coast of Gehrdo located in southwest of Sirik city from December 2019 to November 2020 using net, randomly. Overall, 310 individuals of M. victor were collected which distinguished 181 male and 129 female. Carapace width range of male and female crabs were obtained 16.4-44.3 mm and 19.3-36.9 mm respectively. Also, weight range of male and female crabs were obtained 1.75-37.83 mm and 3.22-16.79 mm respectively. In this study, maximum collected male and female crabs were observed in length range of 19.8-23.2 mm and 26.6-30 mm respectively. There were not any female crabs in length range of 40.2-43.6 mm and 43.6-47 mm. The positive and negative allometric growth were observed for male and female crabs respectively. Also, exponential value (b) estimated of male crab (3.11) was significantly more than of female crab (2.75) (P<0.05). Regression analysis of relative growth between carapace length and carapace width showed significant difference between males and females. Among the studied parameters, proportion of Sternum width, distance between two spines, first abdomen width was significantly more in females (P<0.05). On the other hand, proportion of chela length was significantly more in males (P<0.05). The results derived of this study can useful for conservation of M. victor with aimed to preserve the biodiversity.

کلیدواژه‌ها [English]

  • Sexual dimorphism
  • Morphometric Characters
  • Moon crab
  • Oman Sea
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