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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">sevin</journal-id><journal-title-group><journal-title xml:lang="ru">ПОВОЛЖСКИЙ ЭКОЛОГИЧЕСКИЙ ЖУРНАЛ</journal-title><trans-title-group xml:lang="en"><trans-title>Povolzhskiy Journal of Ecology</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">1684-7318</issn><issn pub-type="epub">2541-8963</issn><publisher><publisher-name>Федеральное государственное бюджетное учреждение науки Институт проблем экологии и эволюции им. А. Н. Северцова РАН; Товарищество научных изданий КМК.</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="doi">10.35885/1684-7318-2021-2-176-190</article-id><article-id custom-type="elpub" pub-id-type="custom">sevin-263</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>Статьи</subject></subj-group></article-categories><title-group><article-title>Пространственное распределение пикосестона в Саратовском водохранилище в летний период</article-title><trans-title-group xml:lang="en"><trans-title>Spatial distribution of picoseston in the Saratov reservoir in summer</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0002-4062-9714</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Краснова</surname><given-names>Е. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Krasnova</surname><given-names>E. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Краснова Екатерина Сергеевна</p><p>445003, г. Тольятти, ул. Комзина, д. 10</p></bio><bio xml:lang="en"><p>Ekaterina S. Krasnova</p><p>10 Komzina St., Togliatti 445003</p></bio><email xlink:type="simple">Krasnova-eck@mail.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0003-2097-4913</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Уманская</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Umanskaya</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Уманская Марина Викторовна</p><p>445003, г. Тольятти, ул. Комзина, д. 10</p></bio><bio xml:lang="en"><p>Marina V. Umanskaya</p><p>10 Komzina St., Togliatti 445003</p></bio><email xlink:type="simple">mvumansk67@gmail.com</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Самарский федеральный исследовательский центр РАН, Институт экологии Волжского бассейна РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Samara Federal Research Scientific Centre of the Russian Academy of Sciences, Institute of Ecology of Volga River Basin of Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2021</year></pub-date><pub-date pub-type="epub"><day>09</day><month>08</month><year>2021</year></pub-date><volume>0</volume><issue>2</issue><fpage>176</fpage><lpage>190</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Краснова Е.С., Уманская М.В., 2021</copyright-statement><copyright-year>2021</copyright-year><copyright-holder xml:lang="ru">Краснова Е.С., Уманская М.В.</copyright-holder><copyright-holder xml:lang="en">Krasnova E.S., Umanskaya M.V.</copyright-holder><license xml:lang="ru" license-type="creative-commons-attribution" xlink:href="https://creativecommons.org/licenses/by/4.0/" xlink:type="simple"><license-p>Данная работа распространяется под лицензией Creative Commons Attribution 4.0.</license-p></license><license xml:lang="en" 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://sevin.elpub.ru/jour/article/view/263">https://sevin.elpub.ru/jour/article/view/263</self-uri><abstract><p>Дана характеристика структуры и пространственного распределения пикосестона в Саратовском водохранилище в июле 2011 и в августе 2014 г. В среднем общее количество клеток и частиц, образующих пикосестон, было 1.87±0.73×106 кл.(част.)/мл; а общая биомасса пикосестона составляла 43.8±19.4 µгC/л. В составе пикосестона Саратовского водохранилища в исследованный период преобладали одиночные гетеротрофные бактерии и фототрофные пикоцианобактерии, образовывавшие 77 – 100% его общей численности и биомассы. Доля пикодетрита была крайне мала (в среднем 4.1% суммарной биомассы пикосестона). В исследованный период в Саратовском водохранилище выявлена высокая гетерогенность распределения пикосестона (Cv составляют 130% для численности и 110% для биомассы). В среднем в устьевых участках численность и биомасса гетеротрофного бактериоплакнтона и пикодетрита были несколько выше, чем на русловых. При этом на устьевых участках численность пикоцианобактерий была выше, а биомасса – ниже по сравнению с русловыми. Общая численность бактериопланктона и автотрофного пикопланктона Саратовского водохранилища в 2011 и 2014 г. соответствовала мезотрофному уровню продуктивности. Пикодетрит, в отличие от водохранилищ Верхней Волги и Камы, не вносит существенного вклада в планктонные пищевые сети Саратовского водохранилища, по крайней мере, в исследованный период.</p></abstract><trans-abstract xml:lang="en"><p>The structure and spatial distribution of picoseston in the Saratov reservoir in July 2011 and August 2014 are described. On average, the total abundance of cells and particles forming picoseston was 1.87±0.73×106 cells (part.)/mL; and the total biomass of picoseston was 43.8±19.4 µg C/L. During the study period, solitary heterotrophic bacteria and phototrophic picocyanobacteria prevailed in the picoseston of the Saratov reservoir, amounting to 77–100% of its total abundance and biomass. The proportion of picodetrital particles was extremely small (on average, 4.1% of the total biomass of picoseston). The high heterogeneity of picoceston distribution (Cv is 130% and 110% for abundance and biomass, respectively) was found in the Saratov reservoir during the study period. On average, the abundance and biomass of heterotrophic bacterioplaknton and picodetritus at stations of the tributary estuaries were slightly higher than in the riverbed. At the same time, the abundance of picocyanobacteria was higher, and the biomass was lower at the estuarine stations compared to the riverbed ones. The total number of bacterioplankton and autotrophic picoplankton in the Saratov reservoir in 2011 and 2014 corresponded to the mesotrophic level of productivity. Picodetrital particles, in contrast to the Upper Volga and Kama reservoirs, make no significant contribution to the planktonic food webs of the Saratov reservoir, at least during the study period.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>гетеротрофный бактериопланктон</kwd><kwd>автотрофный пикопланктон</kwd><kwd>пикодетрит</kwd><kwd>Саратовское водохранилище</kwd></kwd-group><kwd-group xml:lang="en"><kwd>heterotrophic bacterioplankton</kwd><kwd>autotrophic picoplankton</kwd><kwd>picodetritus</kwd><kwd>Saratov reservoir</kwd></kwd-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Гак Д. З., Инкина Г. А. Бактериопланктон Волги и ее водохранилищ в июне – июле 1972 г. // Водные ресурсы. 1975. № 1. С. 109 – 118.</mixed-citation><mixed-citation xml:lang="en">Gak D. Z., Inkina G. A. Bacterioplankton of the Volga and its reservoirs in June–July 1972. 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