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<article article-type="research-article" dtd-version="1.3" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xml:lang="ru"><front><journal-meta><journal-id journal-id-type="publisher-id">ecodag</journal-id><journal-title-group><journal-title xml:lang="ru">Юг России: экология, развитие</journal-title><trans-title-group xml:lang="en"><trans-title>South of Russia: ecology, development</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1992-1098</issn><issn pub-type="epub">2413-0958</issn><publisher><publisher-name>State Institute of Applied Ecology of the Republic of Dagestan</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.18470/1992-1098-2024-3-9</article-id><article-id custom-type="elpub" pub-id-type="custom">ecodag-3225</article-id><article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="ru"><subject>ЭКОЛОГИЯ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ECOLOGY</subject></subj-group></article-categories><title-group><article-title>Оценка численности бактерио‐, пикофито‐ и нанофитопланктона Среднего Каспия методами проточной цитометрии</article-title><trans-title-group xml:lang="en"><trans-title>Estimation of bacterio‐, picophyto‐ and nanophytoplankton abundance in the Middle Caspian Sea by flow cytometry</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-5324-045X</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Муханов</surname><given-names>В. C.</given-names></name><name name-style="western" xml:lang="en"><surname>Mukhanov</surname><given-names>V. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Владимир C. Муханов </p><p>Севастополь</p></bio><bio xml:lang="en"><p>Vladimir S. Mukhanov</p><p>Sevastopol</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-6757-7491</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Рауэн</surname><given-names>Т. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Rauen</surname><given-names>T. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Татьяна В. Рауэн</p><p>Севастополь</p></bio><bio xml:lang="en"><p>Tatiana V. Rauen</p><p>Sevastopol</p></bio><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-0754-9325</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Востоков</surname><given-names>С. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Vostokov</surname><given-names>S. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Сергей В. Востоков, к.б.н., ст. научный сотрудник </p><p>117997, г. Москва, Нахимовский проспект, 36. Тел. +79096236875 </p></bio><bio xml:lang="en"><p>Sergey V. Vostokov, Senior Scientist, Department of Biology </p><p>36 Nakhimovsky Prospekt, Moscow, 117997. Tel. +79096236875 </p></bio><email xlink:type="simple">vostokov_s@mail.ru</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-8547-3776</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Востокова</surname><given-names>А С.</given-names></name><name name-style="western" xml:lang="en"><surname>Vostokova</surname><given-names>A. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Анастасия С. Востокова </p><p>Москва </p></bio><bio xml:lang="en"><p>Anastasia S. Vostokova  </p><p>Moscow</p></bio><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-7688-8454</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Лобачев</surname><given-names>Е. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Lobachev</surname><given-names>E. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Евгений Н. Лобачев</p><p>Махачкала</p></bio><bio xml:lang="en"><p>Evgeny N. Lobachev</p><p>Makhachkala</p></bio><xref ref-type="aff" rid="aff-3"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru">Институт биологии южных морей РАН<country>Россия</country></aff><aff xml:lang="en">A.O. Kovalevsky Institute of Biology of the Southern Seas, Russian Academy of Sciences<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru">Институт океанологии им. П.П. Ширшова РАН<country>Россия</country></aff><aff xml:lang="en">P.P. Shirshov Institute of Oceanology, Russian Academy of Sciences<country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-3"><aff xml:lang="ru">Прикаспийский институт биологических ресурсов Дагестанский федеральный исследовательский центр РАН<country>Россия</country></aff><aff xml:lang="en">Caspian Institute of Biological Resources, Federal Research Centre, Russian Academy of Sciences<country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2024</year></pub-date><pub-date pub-type="epub"><day>21</day><month>10</month><year>2024</year></pub-date><volume>19</volume><issue>3</issue><fpage>97</fpage><lpage>109</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Муханов В.C., Рауэн Т.В., Востоков С.В., Востокова А.С., Лобачев Е.Н., 2024</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="ru">Муханов В.C., Рауэн Т.В., Востоков С.В., Востокова А.С., Лобачев Е.Н.</copyright-holder><copyright-holder xml:lang="en">Mukhanov V.S., Rauen T.V., Vostokov S.V., Vostokova A.S., Lobachev E.N.</copyright-holder><license license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>This work is licensed under a Creative Commons Attribution 4.0 License.</license-p></license></permissions><self-uri xlink:href="https://ecodag.elpub.ru/ugro/article/view/3225">https://ecodag.elpub.ru/ugro/article/view/3225</self-uri><abstract><p>Цель: впервые методом проточной цитометрии изучить в Среднем Каспии структуру и функциональные характеристики бактерио‐, пико‐ и нанофитопланктона в период цветения в начале сентября 2022 г. Для количественной оценки гетеротрофного бактериопланктона, пикофито‐ и нанофитопланктона пробы воды отбирали на разных горизонтах (от поверхности до придонного слоя) на серии станций у западного побережья Каспийского моря на границе между его северной и центральной частями. Съёмку проводили в начале сентября 2022 г. в условиях гидрологического лета, при температуре на поверхности воды от 24,7°С до 26,7°С. Анализ проб проводили с помощью проточной цитометрии.</p><p>У северо‐западного побережья Среднего Каспия были выявлены экстремально высокие концентрации пикофитопланктона (до 1,8×105 кл/мл), представленного, вероятно, пикоцианобактериями Synechococcus. Обнаружены также очень высокие значения обилия нанофитопланктона (до 1,6×105 кл/мл), в составе которого доминировали мелкие жгутиковые. Показано четкое пространст‐ венное разобщение пико‐ и нанофитопланктона. Максимумы нанофитопланктона были приурочены к зоне интенсивного цветения с высокими концентрациями хлорофилла а, тогда как пикофи‐ топланктон достигал пиков обилия южнее, за пределами этой зоны. Обнаружено влияние термоклина на вертикальную структуру микробных сообществ. Под термоклином резко снижались концентрации пикофитопланктона и доля физиологически активных HNA‐бактерий.</p><p>Полученные результаты свидетельствуют о ведущей роли мельчайших фототрофов в пелагиали Каспия и подчеркивают необходимость дальнейших комплексных исследований микробных сообществ Каспия современными методами.</p></abstract><trans-abstract xml:lang="en"><p>Aim. For the first time, flow cytometry has been used to study the structure and functional characteristics of bacterio‐, pico‐ and nano‐ phytoplankton in the Middle Caspian during the bloom period in early September 2022.</p><p>Water samples were taken at different horizons (from the surface to the bottom layer) at a series of stations along the western coast of the Caspian Sea on the border between its northern and central parts to quantitatively assess heterotrophic bacterioplankton, picophyto‐ and nanophy‐ toplankton. Sampling was undertaken in early September 2022 under summer hydrological conditions with water surface temperatures ranging from 24.7°C to 26.7°C. Sample analysis was performed using flow cytometry.</p><p>Extremely high concentrations of picophytoplankton (up to 1.8×105 cells/mL), probably of Synechococcus picocyanobacteria, were detected off the northwestern coast of the Middle Caspian. Very high values of nanophytoplankton abundance (up to 1.6×105 cells/mL), dominated by small flagellates, were also found. A clear spatial uncoupling of pico‐ and nanophytoplankton was revealed. Maximum levels of nanophytoplankton were confined to the area of intensive phytoplankton blooming with high concentrations of chlorophyll a, while picophytoplankton reached peak abundance further south, outside this area. The influence of the thermocline on the vertical structure of microbial communities was detected. The concentrations of picophytoplankton and the proportion of physiologically active HNA‐bacteria decreased sharply under the thermocline.</p><p>The results obtained indicate the leading role of the smallest phototrophs in the Caspian pelagial and emphasise the need for further comprehensive studies of Caspian microbial communities using modern methods.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>Фитопланктон</kwd><kwd>пикофитопланктон</kwd><kwd>нанофитопланктон</kwd><kwd>Synechococcus</kwd><kwd>проточная цитометрия</kwd><kwd>Средний Каспий</kwd></kwd-group><kwd-group xml:lang="en"><kwd>Phytoplankton</kwd><kwd>picophytoplankton</kwd><kwd>nanophytoplankton</kwd><kwd>Synechococcus</kwd><kwd>flow cytometry</kwd><kwd>Middl Caspian</kwd></kwd-group><funding-group xml:lang="ru"><funding-statement>Работа выполнена при финансовой поддержке гранта РФФИ N 20–54–56053, Госзадания № 121040600178‐6 и № 0128‐2021‐0004.</funding-statement></funding-group><funding-group xml:lang="en"><funding-statement>This work was funded by the RFBR according to the research project № 20‐54‐56053, State Assignment, Projects №121040600178‐6 and № 0128‐2021‐0004.</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Востоков С.В., Курашов Е.А., Курьянова О.Ю., Цельмович О.Л., Дмитриев А.В., Островский Д.И., Ковалев М.Ю. 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