fa وضعیت فیتوپلانکتون دریاچه شهدای خلیج فارس (چیتگر) سال 1403 و مقایسه آن با دهه گذشته تخصصي Special پژوهشي Research <span style="font-size:11pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="line-height:normal"><span style="direction:rtl"><span style="unicode-bidi:embed"><span sans-serif="" style="font-family:Calibri,"><span lang="AR-SA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black">هدف این تحقیق، مطالعه تغییرات جامعه فیتوپلانکتون در&nbsp; سال 1403 در دریاچه چیتگر</span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:#0d0d0d"> نسبت به دهه گذشته</span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black"> بود که بر این اساس نمونه ها از 5 ایستگاه در پیکره آبی جمع آوری گردید. در این مطالعه 35 جنس فیتوپلانکتونی شامل </span></span></span><span dir="LTR" style="font-size:10.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">Bacillariophyta</span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black"> (11 جنس)، </span></span></span><span dir="LTR" style="font-size:10.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">Chlorophyta</span></span></span> <span lang="AR-SA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black">&nbsp;(11 جنس)، </span></span></span><span dir="LTR" lang="EN-GB" style="font-size:10.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">Cyanobacteria</span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black"> (7 جنس)،</span></span></span><span dir="LTR" lang="EN-GB" style="font-size:10.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">Mizozoa</span></span></span> <span lang="AR-SA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black">&nbsp;(3 جنس) و </span></span></span><span dir="LTR" style="font-size:10.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">Euglenozoa</span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black"> (3 جنس) شناسائی گردیدند. فراوانی سالانه فیتوپلانکتون</span></span></span> <span lang="AR-SA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black">6/1</span></span></span><span lang="FA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black">7</span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black"> میلیون سلول در لیتر&nbsp; با بیشترین میزان در مرداد (32 میلیون سلول در لیتر) بود. باسیلاریوفیتا با میانگین فراوانی 13 میلیون سلول در لیتر غالب فیتوپلانکتون (74 درصد فراوانی) بود. فراوانی فیتوپلانکتون روند افزایشی داشته </span></span></span><span lang="FA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black">و</span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black"> به میزان 7 برابر</span></span></span><span lang="FA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black"> در مقایسه با مطالعات گذشته</span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black"> افزایش </span></span></span><span lang="FA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black">داشته است</span></span></span><span lang="FA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black">. بویژه </span></span></span><span lang="FA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black">فراوانی جنس</span></span></span><i><span dir="LTR" style="font-size:10.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">Oscillatoria</span></span></span></i> <span lang="FA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black">&nbsp;در مطالعه حاضر در مرداد 607 برابر بیشتر از سال 1392 در ماه مرداد شد، در حالیکه تراکم جنس </span></span></span><i><span dir="LTR" style="font-size:10.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">Microcystis</span></span></span></i><span lang="FA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black"> 470 برابر بیشتر از&nbsp; سال 1393 گردید</span></span></span><span lang="AR-SA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black">.</span></span></span><span lang="FA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black"> میزان کلروفیل</span></span></span><span dir="LTR" lang="EN-GB" style="font-size:10.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">a </span></span></span><span lang="FA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black">&nbsp;در این مطالعه بطور متوسط 7/6 میکروگرم در لیتر بود که نشان دهنده تولیدات اولیه بالای دریاچه است. </span></span></span><span lang="FA" style="font-size:10.0pt"><span b="" mitra="" style="font-family:"><span style="color:black">جهت جلوگیری از افزایش تراکم فیتوپلانکتون رهاسازی کپور نقره&shy;ای باتوجه به میزان تولیدات اولیه دریاچه توصیه می&shy;گردد، همچنین عدم غذا دهی به ماهیان و پرندگان توسط مردم تا حد زیادی مانع از افزایش فیتوپلانکتون و باعث حفظ کیفیت آب در دریاچه چیتگر می&shy;شود.</span></span></span></span></span></span></span></span></span></span><br> &nbsp; <span style="font-size:11pt"><span style="text-justify:kashida"><span style="text-kashida:0%"><span style="line-height:normal"><span sans-serif="" style="font-family:Calibri,"><span new="" roman="" style="font-family:" times="">The aim of this research was to study the changes in the phytoplankton community in </span><span lang="EN-GB" new="" roman="" style="font-family:" times="">the </span><span new="" roman="" style="font-family:" times="">Chitgar Lake in 2024 compared to the previous decade. Accordingly, samples were collected from 5 stations in the water body. A</span><span new="" roman="" style="font-family:" times=""><span style="color:#0d0d0d"> total of 35 phytoplankton taxa were identified, distributed across </span></span><span new="" roman="" style="font-family:" times=""><span style="color:#0d0d0d">Bacillariophyta</span></span> <span new="" roman="" style="font-family:" times=""><span style="color:#0d0d0d">(11 genus), Chlorophyta (11 genus), Cyanobcteria (7 genus), </span></span><span lang="EN-GB" new="" roman="" style="font-family:" times=""><span style="color:#0d0d0d">Mizozoa</span></span> <span new="" roman="" style="font-family:" times=""><span style="color:#0d0d0d">(3 genus), and </span></span><span new="" roman="" style="font-family:" times=""><span style="color:#0d0d0d">Euglenozoa</span></span> <span new="" roman="" style="font-family:" times=""><span style="color:#0d0d0d">(3 genus) in the lake.&nbsp; The annual average phytoplankton abundance was calculated of 17.6 million cells L^-1, peaking in August at 32 million cells L</span></span><span cambria="" math="" style="font-family:"><span style="color:#0d0d0d">⁻</span></span><span new="" roman="" style="font-family:" times=""><span style="color:#0d0d0d">&sup1;. Bacillariophyta dominated the community, contributing 13 million cells L</span></span><span cambria="" math="" style="font-family:"><span style="color:#0d0d0d">⁻</span></span><span new="" roman="" style="font-family:" times=""><span style="color:#0d0d0d">&sup1; (74% of total abundance). Phytoplankton abundance increased 7-fold compared to prior studies. Notably, <i>Oscillatoria</i> density in August 2024 was 607 times higher than in August 2013, while <i>Microcystis</i> abundance was 470 times greater than 2014 levels. Chlorophyll <i>a </i>concentration averaged 6.7 &mu;g L</span></span><span cambria="" math="" style="font-family:"><span style="color:#0d0d0d">⁻</span></span><span new="" roman="" style="font-family:" times=""><span style="color:#0d0d0d">&sup1;, reflecting elevated productivity. To prevent an increase in phytoplankton density, it is recommended to release silver carp, considering the initial production rate. Also, the lack of consumption of fish and bird food by people greatly prevents the increase in </span></span><span lang="EN-GB" new="" roman="" style="font-family:" times=""><span style="color:#0d0d0d">phytoplankton</span></span><span new="" roman="" style="font-family:" times=""><span style="color:#0d0d0d"> and maintenance of water quality in Chitgar Lake.</span></span></span></span></span></span></span><br> &nbsp; تنوع زیستی, فیتوپلانکتون, سیانوباکتریا, تراکم, دریاچه چیتگر Phytoplankton, biodiversity, cyanobacteria, abundance, Chitgar Lake 25 37 http://jweb.ahvaz.iau.ir/browse.php?a_code=A-10-769-2&slc_lang=fa&sid=1 سیامک باقری siamakbp@gmail.com 10031947532846007108 10031947532846007108 Yes پژوهشکده آبزی پروری آبهای داخلی سپیده خطیب حقیقی 10031947532846007109 10031947532846007109 No امید ایمنی 10031947532846007110 10031947532846007110 No