fa بررسی زیست سنجی گونه Brevitrygon manjajiae در آب‌های شمالی خلیج فارس تخصصي Special پژوهشي Research <span style="font-size:11pt"><span style="line-height:150%"><span style="tab-stops:right 468.0pt"><span style="direction:rtl"><span style="unicode-bidi:embed"><span style="font-family:Calibri,sans-serif"><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">گونه</span></span></span> <i><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">Brevitrygon manjajiae</span></span></span></i> <span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">از سفره‌ماهیان خانواده</span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times=""> Dasyatidae </span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">است که اطلاعات زیست‌سنجی و اکولوژیک محدودی از آن در دسترس می‌باشد. هدف این پژوهش بررسی صفات مورفومتریک، روابط همبستگی بین متغیرهای زیستی و الگوی رشد این گونه در آب‌های خلیج فارس بود. در سال </span></span></span><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">۱۴۰۳</span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">، تعداد 43 نمونه از استان‌های بوشهر و هرمزگان جمع‌آوری و پس از انتقال به آزمایشگاه، صفات زیست‌سنجی شامل طول کل </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">(TL)</span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">، عرض دیسک</span></span></span> <span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">(DW)</span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">، طول دیسک</span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">(DL) </span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">، طول بدن</span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">(BL) </span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">، طول و عرض اسپیراکل</span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times=""> SL) </span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">و</span></span></span> <span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">(SW </span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">و وزن بدن اندازه‌گیری شد. داده‌ها با استفاده از آزمون همبستگی اسپیرمن، رگرسیون طول</span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span arial="" style="font-family:">&ndash;</span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">وزن و آزمون</span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times=""> t </span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">مستقل در نرم‌افزار</span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times=""> SPSS </span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">نسخه 24 تحلیل شدند. میانگین عرض دیسک و وزن بدن به‌ترتیب </span></span></span><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">15/38 </span></span></span><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%">&plusmn;</span></span><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> 06/167</span></span></span> <span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">میلی‌متر و </span></span></span><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">21/96 </span></span></span><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%">&plusmn;</span></span><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:"> 29/183</span></span></span> <span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">گرم بود. بیشترین همبستگی بین وزن بدن و عرض دیسک مشاهده شد</span></span></span> <span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">) </span></span></span><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">982/0</span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times=""> (r&nbsp; = </span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">تحلیل هیت‌مپ نیز نشان داد که ابعاد دیسک بیشترین ارتباط را با وزن بدن دارند، در حالی‌که صفات مربوط به اسپیراکل همبستگی ضعیف‌تری نشان دادند. رابطه طول</span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span arial="" style="font-family:">&ndash;</span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">وزن بر اساس عرض دیسک دارای ضریب تعیین بالا </span></span></span><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">(990/0= </span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">R&sup2;</span></span></span><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">) </span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">و ضریب رشد</span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">) </span></span></span><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">22/3</span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times=""> (b = </span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">بود که بیانگر رشد آلومتریک مثبت این گونه است. همچنین با افزایش مرحله بلوغ، میانگین تمامی صفات مورفومتریک افزایش یافت. نتایج آزمون</span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times=""> t </span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">مستقل نشان داد که تنها عرض اسپیراکل بین دو جنس اختلاف معنی‌دار داشت</span></span></span> <span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">(05/0</span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times=""><</span></span></span> <span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">p</span></span></span><span lang="FA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">)</span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times=""> .</span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span style="line-height:150%"><span b="" nazanin="" style="font-family:">به‌طور کلی، عرض دیسک مهم‌ترین شاخص مورفومتریک برای پیش‌بینی وزن در این گونه بوده و یافته‌های این پژوهش می‌تواند در مطالعات زیست‌شناسی، ارزیابی ذخایر و مدیریت حفاظتی سفره‌ماهیان خلیج فارس مورد استفاده قرار گیرد</span></span></span><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">.</span></span></span></span></span></span></span></span></span><br> <span style="font-size:11pt"><span style="line-height:150%"><span style="tab-stops:right 468.0pt"><span style="direction:rtl"><span style="unicode-bidi:embed"><span style="font-family:Calibri,sans-serif"><span dir="LTR" style="font-size:10.0pt"><span style="line-height:150%"><span style="font-family:"Times New Roman",serif"></span></span></span></span></span></span></span></span></span><br> &nbsp; <span style="font-size:11pt"><span style="line-height:150%"><span style="font-family:Calibri,sans-serif"><span style="font-size:10.0pt"><span style="line-height:150%"><span new="" roman="" style="font-family:" times="">Brevitrygon manjajiae is a stingray species of the family Dasyatidae for which limited biometric and ecological information is available. This study aimed to investigate morphometric characteristics, correlations among biological variables, and growth patterns of this species in the Persian Gulf. In 2024, a total of 43 specimens were collected from Bushehr and Hormozgan provinces. After transportation to the laboratory, biometric parameters including total length (TL), disc width (DW), disc length (DL), body length (BL), spiracle length (SL), spiracle width (SW), and body weight were measured. Data were analyzed using Spearman&rsquo;s correlation, length&ndash;weight regression, and independent t-tests in SPSS version 24. The mean disc width and body weight were 167.06&plusmn;38.15 mm and 183.29&plusmn;96.21 g, respectively. The strongest correlation was observed between body weight and disc width (r = 0.982). Heatmap analysis further revealed that disc dimensions had the highest association with body weight, whereas spiracle-related traits showed weaker correlations. The length&ndash;weight relationship based on disc width exhibited a high coefficient of determination (R&sup2; = 0.990) and a growth coefficient of b = 3.22, indicating positive allometric growth. Morphometric measurements increased with maturity stage. Independent t-test results showed that only spiracle width differed significantly between males and females (p < 0.05). Overall, disc width was identified as the most important morphometric predictor of body weight in B. manjajiae. These findings provide valuable information for biological studies, stock assessment, and conservation management of stingrays in the Persian Gulf.</span></span></span></span></span></span><br> &nbsp; رابطه طول–وزن, رشد آلومتریک, صفات ریخت‌سنجی , همبستگی زیستی Allometric growth, Biological correlation, Length–weight relationship, Morphometric traits 31 40 http://jair.gonbad.ac.ir/browse.php?a_code=A-10-1140-1&slc_lang=fa&sid=1 Amir Mozafar Hosseini امیر مظفر حسینی amirmozafarhosseiny@gmail.com 100319475328460010135 100319475328460010135 Yes Khorramshahr University of Marine Science and Technology دانشگاه علوم و فنون دریایی خرمشهر Majid Askari Hesni مجید عسکری حصنی mahesni@uk.ac.ir 100319475328460010136 100319475328460010136 No Shahid bahonar university of kerman دانشگاه شهید باهنر کرمان Najmeh Sabbah نجمه صباح najmesabbah@gmail.com 100319475328460010137 100319475328460010137 No Guilan University دانشگاه گیلان