فاکتور‌های محیطی موثر بر انتخاب زیستگاه در سه گونه غضروف ماهیان در آب های ایرانی دریای عمان

نوع مقاله: محیط زیست جانوری

نویسندگان

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

2 مرکز تحقیقات شیلاتی آب های دور ، مؤسسه تحقیقات علوم شیلاتی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، چابهار، ایران

3 پژوهشکده اکولوژی خلیج فارس و دریای عمان، موسسه تحقیقات علوم شیلاتی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، بندرعباس، ایران

چکیده

مطالعه حاضر با هدف بررسی اثر عوامل محیطی بر پراکنش و انتخاب زیستگاه در سه گونه هم­زیست از ماهیان غضروفی در دریای­ عمان انجام شد. نمونه ­برداری از مهر­ماه لغایت آبان ماه 1396 از نوار شمالی دریای ­عمان به ­وسیله کشتی ترال کف کلاس فردوس انجام شد. فاکتور‌های محیطی به وسیله CTD ثبت گردید و جهت تعیین فاکتور‌های تاثیرگذار بر انتخاب زیستگاه در گونه‌های مورد مطالعه از مدل GAM استفاده گردید. نتایج نشان داد که عامل محیطی کلروفیل a بیش ­ترین تاثیر در انتخاب زیستگاه در گونه Iago omanensis دارد. در دیگر سو، فراوانی گونه  Rhinobatos annandalei­ ارتباط معنی­ داری با فاکتورهای محیطی اکسیژن محلول، کلروفیل a، درجه حرارت و هدایت الکتریکی داشت. از طرفی، فاکتور‌های محیطی درجه حرارت و هدایت ­الکتریکی بر پراکنش گونه Torpedo sinuspersici نقش مهمی داشتند. نتایج مطالعه حاضر، علم و شناخت را از اکولوژی پراکنش ماهیان غضروفی هم­زیست در دریای ­عمان را بهبود بخشید که می­ تواند در معرفی مکان‌ های با احتمال حضور این گونه‌ ها و تجزیه ­و­ تحلیل مکانی آن‌ ها برای سایر محققین علاقه ­مند و مدیریت شیلاتی در آینده مورد استفاده قرار گیرد.

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