نخستين گزارش از خصوصيات ريخت شناسي و فراواني مراحل لاروي گونه Polyonyx sp. (Anomura: Porcellanidae) از سواحل ايراني خليج فارس

Study of morphological charachteristic and abundance of larval stages of Polyonyx sp. (Anomura: Porcellanidae) for the first time from Iranian costal of Persian Gulf

اين مطالعه به منظور بررسي مراحل لاروي گروه خرچنگ‌هاي منزوي در سواحل ايراني خليج فارس از اسفند ماه 89 تا مهرماه 90 به صورت ماهانه انجام گرديد. نمونه برداري با استفاده از تور پلانكتون با چشمه 300 ميكرون و به روش كشش مورب از عمق به سطح از 7 ايستگاه انجام گرفت. طي اين بررسي مراحل لاروي گونه Polyonyx sp. شناسايي و ترسيم شد. تراكم اين گونه نيز در ماه هاي نمونه برداري محاسبه و بيشترين تراكم آن در ارديبهشت ماه (3/10±7/52 فرد در مترمكعب) محاسبه گرديد كه علت آن مي تواند در ارتباط با تراكم بالاي فيتوپلانكتون‌ها و به دنبال آن ازدياد پاروپايان در اين ماه باشد كه غذاي اصلي لاروخرچنگ‌هاي منزوي را تشكيل مي دهند

Anomura is a group of Malacostraca that constitute important communities of marine intertidal zone and deeper communities of benthic habitats. The larval stages differ among families of Anomura. In this investigation Anomura larval populations were sampled and studied from Iranian coastal waters of Persian Gulf in monthly basis from March to October 2011. Sampling process was conducted using surfing plankton net (mesh size 300 micron) and oblique tows were made from near the bottom to the surface water in 7 stations. Finally Polyonyx sp. were identified and their schematic figures were made using Camera Lucida. Maximum value of the average abundance of larvae (52.7±10.3 N/M3) was shown in May, the reason of ht related to the high accumulation of phytoplankton and consequently copepods, that are the main foods of Anomura larvae.