دینامیک جمعیت، خصوصیات مرفومتریک و رابطه طولی وزنی دوکفه ای Mytilaster lineatus در سواحل جنوب غربی دریای خزر (استان گیلان)

نوع مقاله : مقاله پژوهشی

نویسندگان

گروه زیست شناسی دریا، دانشکده علوم، واحد لاهیجان، دانشگاه آزاد اسلامی، لاهیجان، ایران

10.22034/AEJ.2020.249551.2361

چکیده

یکی از مشکلات اصلی دریای خزر، آلودگی زیستی آن تحت تاثیر ورود گونه های مهاجم و پراکنش آن ها است. دوکفه ای  Mytilaster lineatus گونه ای مهاجم است که توانسته موقیعت خود را پس از ورود در خزر تثبت کند. اهداف این تحقیق بررسی دینامیک جمعیت ، پراکندگی، خصوصیات مرفومتریک، درصد پوشش ، فراوانی و رابطه طولی وزنی این گونه در سواحل استان گیلان بوده است. تعداد هفت ایستگاه در طول نوار ساحلی استان گیلان انتخاب، فاکتورهای محیطی در آن ها اندازه گیری و نمونه برداری ها از سواحل سنگی  طبیعی­ و­ انسان ­ساز ­به صورت ­ماهانه ­در ­طول ­یک ­سال ­(فروردین ­تا­ اسفند 98) ­توسط­ کوادرات 15*15 سانتی متر انجام­ پذیرفت­. نتایج نشان ­دادند که ­میانگین ­سالانه شوری ­آب 2/97±9/85 در هزار­، ­دمای ­آب 5/01±16/44 ­سانتی گراد، ­اکسیژن ­محلول آب 9/75±9/88 میلی گرم بر لیتر­بوده است. میانگین تعداد نمونه ها در کوادرات ها 49/86±324/05 عدد ومیانگین وزن 44/59±25/65 گرم و­ میانگین طول پوسته 35/68±11/0 میلی متر و بین ­ایستگاه ها اختلاف معنی داری آماری وجود داشته است. ازمون مولفه های اصلی نیز نشان داد که شوری و اکسیژن محلول آب بیش ترین همبستگی را با فراوانی این گونه داشته اند. میانگین میزان پوشش دوکفه ای در ایستگاه های مختلف 50/830±28/31 درصد که بیش ترین آن در بندر انزلی و در شهریور تعیین گردید. بیش ترین میزان فراوانی طولی مربوط به کفه های 11 میلی متر و رابطه طولی وزنی این گونه نیز دارای همبستگی بالا (95=r2) بوده است.مقایسه گروه های طولی مختلف نشان داد که لاروها از تیر تا آبان و گروه بالغین فروردین تا شهریور بیش تر غالب بوده و مخلوط دو گروه از شهریور تا اسفند دیده شدند. الگو طولی نیز نشان از زادآوری این گونه در تابستان و ماه های اویل پاییز در حوضه جنوب غربی دریایی خزر داشته است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Population dynamics, morphometric characteristics and length-weight relationship of Mytilaster lineatus on the southwest coast of the Caspian Sea (Gilan province)

نویسندگان [English]

  • Milad Sharifi
  • Mohammad Reza Rahimibashar
Department of Marine Biology, Faculty of Science, Lahijan branch, Islamic Azad University, Lahijan, Iran
چکیده [English]

One of the main problems of the Caspian Sea is its biological pollution due to the entry of invasive species and their distribution. The bivalve Mytilaster lineatus is an invasive species that has been able to stabilize its position after entering the Caspian Sea. The objectives of this study were to investigate population dynamics, dispersion, morphometric characteristics, coverage percentage, frequency and longitudinal weight relationship of this species in the coasts of Gilan province. Seven stations along the coastal strip of Gilan province were selected and sampling from rocky, natural, and man-made beaches on a monthly basis during a year (April2019 to March 2020) was carried out by 15 x15 cadres. The results showed that the average annual salinity of water is 9.85 ± 2.97 per thousand, water temperature is 16.44 ±5.01° C, oxygen آب water solution is 9.88±9.75 mg / L have been. The mean and standard deviation of the number of samples in the squares were 324.05 ± 49.86 and the mean weight was 25.65 ± 44.59 and the mean shell length was 11.35± 0.68 mm and there were significant differences between different stations. The principal components test also showed that the salinity and oxygen of the water solution had the highest correlation with the frequency of this species. The maximum longitudinal frequency at 11 mm was also determined. The length-weight relationship of this species had a high correlation (r2=95). Comparison of different longitudinal groups showed that the larvae were more present from July to November and the adult group from April to September and a mixture of the two groups was seen from September to March.This longitudinal pattern indicates the reproduction of this species in summer and early autumn months in the southern Caspian basin.

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