fa مقاله علمی – پژوهشی:‌ اولین گزارش از فیتوپلانکتون غیر بومی Dinophysis acuminata سواحل بندرانزلی، دریای خزر اكولوژي محيطهاي آبي اكولوژي محيطهاي آبي پژوهشي Research <span style="font-size:11pt"><span style="direction:rtl"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><span lang="FA" style="font-size:12.0pt"><span b="" compset="" style="font-family:"><span style="color:black">این مطالعه با هدف تغییرات جامعه فیتوپلانکتونی‌ جنوب دریای خزر و تأکید بر تأثیر تغییر اقلیم صورت گرفت. مطالعه حاضر در اردیبهشت 1402 در سواحل بندر انزلی در عمق کمتر از 10 متری انجام شد. در مجموع، 33 جنس و گونه از شاخه‌های اکروفیتا، کلروفیتا، سیانوباکتریا و میزوزوآ شناسایی شدند. فراوانی کل فیتوپلانکتون 53000 </span></span></span><span lang="FA" style="font-size:12.0pt"><span style="color:black">&plusmn;</span></span><span lang="FA" style="font-size:12.0pt"><span b="" compset="" style="font-family:"><span style="color:black"> 135000 سلول در لیتر بود. در میان گونه‌های فیتوپلانکتون، آکروفیتا دارای بیشترین فراوانی حدود 63000 </span></span></span><span lang="FA" style="font-size:12.0pt"><span style="color:black">&plusmn;</span></span><span lang="FA" style="font-size:12.0pt"><span b="" compset="" style="font-family:"><span style="color:black"> 99900 سلول در لیتر بود. یافته‌ها افزایش فراوانی جوامع فیتوپلانکتون را در سال 1402 به میزان 7 برابر بیشتر از سال 1387 نشان دادند. گونه غیر بومی </span></span></span><i><span dir="LTR" style="color:black">Dinophysis acuminata</span></i><span lang="FA" style="font-size:12.0pt"><span b="" compset="" style="font-family:"><span style="color:black"> از شاخه </span></span></span><span dir="LTR" style="color:black">Myzozoa</span><span lang="FA" style="font-size:12.0pt"><span b="" compset="" style="font-family:"><span style="color:black">، برای اولین بار در مطالعه حاضر</span></span></span> <span lang="FA" style="font-size:12.0pt"><span b="" compset="" style="font-family:"><span style="color:black"><span style="letter-spacing:.3pt">در دریای خزر شناسایی شد و فراوانی آن 730 </span></span></span></span><span lang="FA" style="font-size:12.0pt"><span style="color:black"><span style="letter-spacing:.3pt">&plusmn;</span></span></span><span lang="FA" style="font-size:12.0pt"><span b="" compset="" style="font-family:"><span style="color:black"><span style="letter-spacing:.3pt"> 1620 سلول در لیتر و اندازه&nbsp; &nbsp;آن 30 میکرون بود. احتمالاً افزایش شوری (</span></span></span></span><span dir="LTR" lang="EN-GB" style="color:black"><span style="letter-spacing:.3pt">psu</span></span><span lang="FA" style="font-size:12.0pt"><span b="" compset="" style="font-family:"><span style="color:black"><span style="letter-spacing:.3pt">&nbsp; 13)</span></span></span></span><span lang="FA" style="font-size:12.0pt"><span b="" compset="" style="font-family:"><span style="color:black"> و<span style="letter-spacing:.3pt">افزایش دمای سطح&shy;آب (تغییر اقلیم)دریای خزر باعث پیدایش</span>گونه </span></span></span><i><span dir="LTR" style="color:black">D</span></i><span dir="LTR" style="color:black">. <i>acuminata</i></span><span style="font-size:12.0pt"><span b="" compset="" style="font-family:"><span style="color:black"> شده است.</span></span></span><span dir="LTR" style="color:black"></span></span></span></span></span><br> <br> <span style="font-size:12pt"><span style="direction:rtl"><span style="unicode-bidi:embed"><span new="" roman="" style="font-family:" times=""><i><span dir="LTR" style="color:black"></span></i></span></span></span></span> <span style="font-size:11pt"><span style="line-height:17.0pt"><span style="font-family:Calibri,sans-serif"><span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">This study focused on</span></span></span><span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"> the changes in the phytoplankton community of the</span></span></span> <span lang="EN-GB" style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">southern</span></span></span><span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"> Caspian Sea with an emphasis </span></span></span><span lang="EN-GB" style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">on the</span></span></span><span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"> climate change effect. </span></span></span><span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">The present study was conducted in the Anzali coast at </span></span></span><span lang="EN-GB" style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">10</span></span></span><span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"> m depth in </span></span></span><span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">May 2023. </span></span></span><span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">A total of 33 genera and species were identified from the phyla of Ochrophyta, Chlorophyta, Cyanobacteria, and Myzozoa. The total phytoplankton abundance was measured 135,000&plusmn;53.000 cells/l. Among the phytoplankton taxa, Ochrophyta had the highest abundance about 99,900&plusmn;63,000 cells/l. These findings showed an </span></span></span><span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">increase in the abundance of phytoplankton in 2023 was 7-fold more than in 2008. The non-native phytoplankton, </span></span></span><i><span lang="EN-GB" style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">Dinophysis </span></span></span></i><i><span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">acuminata</span></span></span></i><span lang="EN-GB" style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black"> from </span></span></span><span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">Myzozoa phylum was recorded in the Caspian Sea for the first time. The abundance of <i>D</i>. <i>acuminate </i>was<i> </i>16</span></span></span><span lang="EN-GB" style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">20</span></span></span> <span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">&plusmn; 730 cells/l and the size of the phytoplankton was 30 &micro;m. Probably increase in salinity (13 psu) and increase in </span></span></span><span lang="EN-GB" style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">sea </span></span></span><span style="font-size:12.0pt"><span new="" roman="" style="font-family:" times=""><span style="color:black">surface temperature (Climate change) of the Caspian Sea caused the appearance of <i>D. acuminate</i> species.</span></span></span><span dir="RTL" lang="FA" style="font-size:12.0pt"><span b="" nazanin="" style="font-family:"><span style="color:black"></span></span></span></span></span></span> تغییر اقلیم, فیتوپلانکتون, غیربومی, دریای خزر Climate change, Phytoplankton, Exotic species, Caspian Sea 121 127 http://isfj.ir/browse.php?a_code=A-10-471-7&slc_lang=fa&sid=1 siamak Bagheri سیامک باقری siamakpb@gmail.com 100319475328460036818 100319475328460036818 Yes Iranian Fisheries science research Institute موسسه تحقیقات علوم شیلاتی کشور Jalil Sabkara جلیل سبک آرا jsabkara@yahoo.com 100319475328460036819 100319475328460036819 No Iranian Fisheries science research Institute موسسه تحقیقات علوم شیلاتی کشور