بررسی وضعیت دوریختی جنسی در گاوماهی چشم‌نواری (1822 Glossogobius giuris (Hamilton, در حوضه مکران، سیستان و بلوچستان

نوع مقاله: ریخت شناسی

نویسندگان

1 دانشکده کشاورزی و منابع طبیعی دانشگاه لرستان، خرم‌آباد، لرستان، ایران

2 گروه شیلات، پردیس کشاورزی و منابع طبیعی کرج، دانشکده منابع طبیعی، دانشگاه تهران، کرج، ایران

3 گروه کشاورزی، دانشگاه پیام نور، کرج، ایران

چکیده

به‌منظور مطالعه دوریختی جنسی گاوماهی چشم‌نواری (Glossogobius giuris)، تعداد 60 قطعه ماهی (شامل 30 قطعه از هر جنس) با استفاده از دستگاه الکتروشوکر طی تابستان 1392 از رودخانه باهوکلات، پایین‌تر از سد پیشین در استان سیستان و بلوچستان صید و به آزمایشگاه ماهی‌شناسی دانشگاه تهران منتقل گردید. برای این منظور تعداد 22 صفت اندازشی و پنج صفت شمارشی موردبررسی قرار گرفت. نتایج آماره‌های توصیفی داده‌ها نشان داد تنوع ریختی بین نمونه‌ها (به‌ویژه تعداد شعاع غیرمنشعب باله پشتی اول، تعداد شعاع‌های منشعب باله پشتی دوم و تعداد شعاع‌های منشعب باله مخرجی) بیش از مقادیر گزارش شده در مطالعات پیشین است که این امر را می‌توان به‌عنوان تنوع ریختی به این گونه نسبت داد. نتایج تجزیه‌وتحلیل آماری براساس آنالیز تشخیصی (DFA) و آزمون جایگشت (Permutation test) برای صفات اندازه‌ای و تجزیه ‌و تحلیل تطابقی CA) Correspondence Analysis ) برای صفات شمارشی نشان داد که بین دو جنس نر و ماده هم ­پوشانی بالایی وجود داشته و براساس صفات استفاده شده در این مطالعه نمی‌توان جنس‌های نر و ماده را از هم تشخیص داد.

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