تحلیل روابط تغییرات تنوع گونه ای جنس Acropora در خلیج فارس بر اساس فاکتورهای اکولوژیک

Document Type: Research Paper

Authors

1 عضو هیات علمی دانشگاه محیط زیست

2 کارشناس

Abstract

جزایر مرجانی از مهمترین منابع تولید انرژی در اکوسیستم‌های دریایی هستند که میزان تولید انرژی در این اکوسیستم‌ها، معادل جنگل‌های حاره‌ای است. مرجان‌ها همچنین تأمین کننده سرپناهی مناسب برای دیگر گونه‌های جانوران آبزی بوده و به عنوان مهمترین مراکز تنوع زیستی در دریا محسوب می‌گردند. روند نگران‎کننده کاهش تنوع زیستی در مرجان‎‌های سازنده آب‌سنگ‌ها نیز مشاهده شده‌است. با توجه به این‌که تنوع موجودات وابسته به آبسنگ‎های مرجانی با تنوع آبسنگ‎ها رابطه مستقیم دارد، لذا کاهش تنوع مرجان‎ها اهمیتی مضاعف دارد. جهت انجام مطالعات تنوع گونه ای، از فرم تغییریافته ترانسکت خطی با فواصل مشخص شده در عمق‎های 3، 6 و 9 متری جزایر لارک، فارور و خارک استفاده گردید. بررسی شاخص ها حاکی از آن است که کلیه اندیسهای مورد ارزیابی (تنوع، غنای گونه و یکنواختی فراوانی گونهها)، در امتداد طول خلیجفارس کاهش معنی داری را از سمت شرق به غرب نشان میدهند. این کاهش می تواند به دلیل یا دلایل رابطه معکوس جزیره و سرزمین اصلی، وجود شیب فزاینده فاکتورها در جهت شرق به غرب یا نوسانات شدید آنها در آن راستا و احتمال دخالت عوامل بیوتیک (از جمله رقابت) باشد.

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