علوم و فنون شیلات

علوم و فنون شیلات

بررسی ارتباط غذایی گونه‌های سپرماهی خانواده Dasyatidae با بزرگ‌بی‌مهرگان کفزی در مناطق صیدگاهی آب‌های استان هرمزگان

نوع مقاله : پژوهشی اصیل

نویسندگان
1 پژوهشکده اکولوژی خلیج فارس و دریای عمان، موسسه تحقیقات علوم شیلاتی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، بندرعباس، ایران
2 پزوهشکده اکولوژی خلیج فارس و دریای عمان، موسسه تحقیقات علوم شیلاتی کشور، سازمان تحقیقات، آموزش و ترویج کشاورزی، بندرعباس، ایران
چکیده
.مطالعه حاضر در جهت کسب اطلاعات لازم از وضعیت، تنوع، فراوانی و پراکنش بزرگ بی‌مهرگان کفزی آب‌های مناطق ساحلی در استان هرمزگان و بررسی وضعیت چرای ماهیان کفزی از بزرگ‌بی‌مهرگان کفزی پی‌ریزی شده است. بدین منظور نمونه‌برداری در سال‌های 1397 و 1398 و هر سال یک‌بار در فصل پاییز انجام شد. در این تحقیق درمجموع تعداد 125 جنس و 104 گونه متعلق به 85 خانواده، 31 راسته، 9 رده و 7 شاخه از بزرگ‌بی‌مهرگان کفزی شناسایی شدند. بررسی رده‌های شناسایی‌شده نشان داد که سخت‌پوستان (Malacostraca) بیشترین فراوانی را در تمامی ایستگاه‌های نمونه‌برداری شده دارا است. به‌منظور دستیابی به وجود رابطه احتمالی بین پراکنش و یا تنوع بزرگ‌بی‌مهرگان کفزی با پراکنش و فراوانی سپر‌ماهیان، آزمون CCA انجام پذیرفت. محتویات معده سپر‌ماهیان موردبررسی قرار گرفتند. در محتویات معده Maculabatis randalli سخت‌پوستان (25/93 IRI%) بیشترین میزان را داشتند. این الگوی تغذیه‌ای برای دو گونه Himantura walga و M. gerrardi نیز تکرار شد با این تفاوت که دوکفه‌ای‌ها (Bivalvia) در گونه M. gerrardi در مرحله اول اهمیت قرار گرفتند (33/31 IRI%). همچنین تجزیه‌وتحلیل سطح تغذیه‌ای برای هر سه گونه انجام شد که نشان می‌دهد هر سه گونه در دسته شکارچیان میانه در زنجیره غذایی قرار دارند که در این خصوص جایگاه مشترکی داشتند. با توجه به نتایج، برخی از بزرگ‌بی‌مهرگان کفزی شناسایی‌شده در این پژوهش ارتباط معنی‌داری با ماهیان کفزی دارند که بررسی نحوه ارتباط دقیق آن‌ها نیاز به مطالعات بیشتر دارد.
کلیدواژه‌ها

موضوعات


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