نوع مقاله : مقاله پژوهشی

نویسندگان

1 گروه زیست شناسی دریا، دانشکده علوم دریایی و اقیانوسی، دانشگاه علوم و فنون دریایی خرمشهر، خرمشهر، ایران.

2 گروه محیط زیست، دانشکده منابع طبیعی دریا، دانشگاه علوم و فنون دریایی خرمشهر، خرمشهر، ایران.

چکیده

بررسی پلانکتونی آب های جنوبی ساحلی قشم در استان هرمزگان طی دو فصل سرد و گرم و در چهار ایستگاه(ساحل پارک زیتون، ساحل سوزا، ساحل شیب درازو ساحل سلخ) در سال 1395-1394 انجام شد. به­ طور کلی طی این بررسی، گونه‌های مختلف فیتوپلانکتونی متعلق به چهار رده دیاتومه‌ها­(Bacillariophyceaeدینوفلاژله ­هاDinophyceae))،کلروفیسه­ ها(Chlorophyceae) و جلبک های سبز–آبی(Cyanophyceae) شناسایی گردید. فیتوپلانکتون ها تا حد جنس شناسایی شدند، از رده دیاتومه31، از رده دینوفلاژله 11، از رده کلروفیسه 6 و از رده سیانوفیسه 4 جنس شناسایی شدند. میانگین (± خطای استاندارد) تراکم و شاخص‌های  سیمپسون، پایلو، شانون و مارگالف به ترتیب 63/9±6705/72 سلول در لیتر، 0/34± 0/82، 12/17±0/1، 9/19±9/0 و 0/38± 2/61 در فصل گرم و 53/2 ±13/ 5666 سلول در لیتر، 0/06± 0/77، 12/11±1/0، 9/17±1/0 و 0/43± 2/26 در فصل سرد به دست آمد. بیشترین میزان شباهت فیتوپلانکتونی فصلی بر اساس ضرایب سورنسن و جاکارد، به ترتیب 0/97 و 0/88 در فصول گرم و سرد بود. همبستگی معنی داری بین تنوع سیمپسون و شانون- وینر با شوری و فسفات مشاهده گردید. در حالی­که تراکم فیتوپلانکتون ها با شوری و pH همبستگی معنا داری نشان داد. نتایج نشان داد مناطق مورد مطالعه از نظر شرایط اکولوژیک دارای رتبه متوسط و جامعه فیتوپلانکتونی از تنوع و غنای نسبتاً خوبی برخوردار است.

کلیدواژه‌ها

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