بررسی ساخـتـار جمعـیـت فیـتـوپـلانـکـتـون‌ دریـاچه پـشـت سـدلار

نوع مقاله: پژوهشی

نویسنده

گروه شیلات، دانشگاه آزاد اسلامی واحد تهران شمال

چکیده

این تحقیق به منظوربررسی تنوع،تراکموپراکنشفیتوپلانکتون­ دریاچه سدلار وتغییرات آن هاطی3 مرحلهنمونه­برداریازتیر­ماهالیشهریورماهسال1393انجامپذیرفت. نمونه­ها پس از جمع آوری، بافرمالین4 درصدتثبیتوبا میکروسکوپ های معکوس ونوری معمولی شناسایی و شمارششدند.ازبینجنس­هایشناساییشده،8 جنسمربوطبهدیاتومه ها،7جنسمربوطبهجلبک­های سبز،3جنسمربوطبهدینوفیسه،1جنسمربوطبهشاخه  اوگلنوفیسه و5جنسمربوطبه شاخهسیانوباکتر بودند. انواع جلبک­های شاخهدیاتومبا59/88 درصدبیشترین جمعیتتابستانه راتشکیل دادند. جنسغالب این شاخه در دوره مطالعه­ Asterionella  بود. سایر جنس­های این شاخه به ترتیب فراوانی Navicula، Melosira، Cymbella ، Nitzschia ، Cyclotella ، Synedra  و Diatoma بود. شاخه جلبک­های سبز با فراوانی 48/6 درصد با جنس­هایClosterium، Oocystis ،Pandorina ،Gonium، Chodatella، Scenedesmus و Chlorella در رده دوم اهمیت قرار داشت. سایرشاخه­هایفیتوپلانکتون مشاهده شده در مدت مطالعهعبارتبودنداز  سیانوباکتر با فراوانی 88/2 درصد و شامل جنس­های Anabaena ، Merismopedia ، ­ Gleocapsa،Oscillatoriaو Coelosphaeriumبود. جلبک­های دینوفیسه با فراوانی 76/1 درصد و جنس های Peridinium، Gymnodinium و   Ceratium و در نهایت جلبک­های اوگلنوفیسه با فراوانی ناچیز 25/0 درصد و جنس Euglena. مورد شناسایی قرار گرفتند. طی مدت نمونه برداری بالاترین میانگین تراکم مربوطبهجلبک­هایدیاتومباتعداد 2± 1560733عدددرلیترو جنس Asterionella پلانکتون غالباینشاخه بود. رتبه دوم متعلق به شاخه جلبک های سبز بامیانگینتعداد2±  164600 عدددرلیترو جنس­هایغالبآن Pandorina ، Scenedesmus و Chlorella  بود.در مجموع با توجه به پایین بودن تنوع پلانکتونی در فصل تابستان و دوره نمونه برداری به نظر می رسد توانتولیدپلانکتونیدر دریاچه پشت سد لار در حد پایینی قرار داشته باشد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Study on the structure of phytoplankton population in the Lar dam lake

نویسنده [English]

  • F. Karbalaee
Dept. of Fisheries, Islamic Azad University Tehran North Branch
چکیده [English]

In this study, in order to investigate limnological and biological parameters of Lar dam lake such as indentification determination of the density and distribution of phytoplanktons, sampling were done during 3 months (July-August-September) and fixed in formalin 4% and transferred to laboratory for further investigation under inverted microscope. In this study, 24 genera which belonged to 5 phytoplanktonic phyla were identified. Among these genera, 8 were belonged to Ochriphyta, 7 generaus was belonged to Chlorophyta, 3 genera were belonged to Dinophyta, 1 genera were belonged to Euglenophyta, 5 generaus was belonged to Cyanobacteria. In this reservoir dam, Ochriphyta was the dominant phytoplanktom phylum with being annually 88.59% of the population, and followeding by genera Asterionella was dominat samples. The others Other phytoplanktonic phylla were: Chlrophyta, Cyanobacteria, Dinophyta and Euglenophyta with following frequencies: of 6.48%, 2.88%, 1.76% and 0.25% respectively, followed by the and following genera: (Pandorina, Scendemus, Closterium, Oocystis, Gonium, Chodatella and Chlorella), (Anabaena, Merismopedia, Oscillatoria, Gleocapsa,  and Coelosphaerium), (Peridinium, Gymnodinium and Ceratium) and (Euglena). In all of the sampling months, the highest average density was belonged to Ochriphyta with 1560733 number per liter and the dominant genus of this phyllum which was observed in high number during in a months, was Asterionella. After that was, followed by Chlorophyta with average number of 164600 per liter and its dominant genera were Scenedesmus, Pandorina and Chlorella, respectively. Biological studies indicated that this reservoir had low planktonic generation potential.

کلیدواژه‌ها [English]

  • Phytoplankton
  • Lar reservoir dam
  • population structure
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