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<article 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" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Botanical Journal</journal-id><journal-title-group><journal-title xml:lang="en">Botanical Journal</journal-title><trans-title-group xml:lang="ru"><trans-title>Ботанический журнал</trans-title></trans-title-group></journal-title-group><issn publication-format="print">0006-8136</issn><issn publication-format="electronic">2658-6339</issn><publisher><publisher-name xml:lang="en">The Russian Academy of Sciences</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">690846</article-id><article-id pub-id-type="doi">10.31857/S0006813625070022</article-id><article-id pub-id-type="edn">hlongq</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>COMMUNICATIONS</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>СООБЩЕНИЯ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Flora of diatoms (Bacillariophyta) in coastal biotopes of Nalychevo Lake (eastern Kamchatka)</article-title><trans-title-group xml:lang="ru"><trans-title>Флора диатомовых водорослей (Bacillariophyta) прибрежных биотопов озера Налычево (Восточная Камчатка)</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Genkal</surname><given-names>S. I.</given-names></name><name xml:lang="ru"><surname>Генкал</surname><given-names>С. И.</given-names></name></name-alternatives><email>genkal47@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lepskaya</surname><given-names>E. V.</given-names></name><name xml:lang="ru"><surname>Лепская</surname><given-names>Е. В.</given-names></name></name-alternatives><email>lepskaya@list.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Chernyagina</surname><given-names>O. A.</given-names></name><name xml:lang="ru"><surname>Чернягина</surname><given-names>О. А.</given-names></name></name-alternatives><email>kamchatika@mail.ru</email><xref ref-type="aff" rid="aff3"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Papanin Institute for Biology of Inland Waters of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт биологии внутренних вод им. И. Д. Папанина РАН</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Kamchatka Branch of Russian Federal Research Institute of Fisheries and Oceanography</institution></aff><aff><institution xml:lang="ru">Камчатский филиал ФГБНУ Всероссийский научно-исследовательский институт рыбного хозяйства и океанографии</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">Kamchatka Branch of Pacific Geographical Institute, Far-Eastern Branch RAS</institution></aff><aff><institution xml:lang="ru">Камчатский филиал Федерального государственного бюджетного учреждения науки Тихоокеанский институт географии Дальневосточного отделения РАН</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2025-07-15" publication-format="electronic"><day>15</day><month>07</month><year>2025</year></pub-date><volume>110</volume><issue>7</issue><issue-title xml:lang="en">VOL 110, NO7 (2025)</issue-title><issue-title xml:lang="ru">ТОМ 110, №7 (2025)</issue-title><fpage>634</fpage><lpage>648</lpage><history><date date-type="received" iso-8601-date="2025-09-21"><day>21</day><month>09</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2025, Russian Academy of Sciences</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2025, Российская академия наук</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="en">Russian Academy of Sciences</copyright-holder><copyright-holder xml:lang="ru">Российская академия наук</copyright-holder></permissions><self-uri xlink:href="https://bioethicsjournal.ru/0006-8136/article/view/690846">https://bioethicsjournal.ru/0006-8136/article/view/690846</self-uri><abstract xml:lang="en"><p>The study of materials from littoral biotopes of Nalychevo Lake (“Nalychevo” Natural Park, Eastern Kamchatka) using scanning electronic microscopy revealed 164 taxa of diatoms from 57 genera, including new ones to the flora of Russia: Cocconeis pseudothumensis, Cymbopleura acutiformis, Encyonema subminutum, Gomphonema cf. khienticense, and Witkowskia parvapolonica. 15 algae have been identified to the genus only, namely Achnanthidium, Amphora, Caloneis, Cocconeis, Encyonema, Fragilaria, Gomphonema, Navicula, Pinnularia, Placoneis, Planothidium, Sellaphora. The obtained data have significantly expanded taxonomic spectrum of Bacillariophyta in the lake: from 35 to 189 species and varieties, and from 18 to 58 genera. The most taxonomically diverse are the genera Achnanthidium (8 taxa), Navicula (13) and Gomphonema (16). Ecological analysis of the flora of Bacillariophyta from biotopes with agglomerations of Aegagropila colonies of various ages has shown that the vast majority of discovered algae prefer fresh, subalkaline water bodies. According to saprobity index, the surveyed littoral areas of the lake are classified as oligosaprobic with elements of mesosaprobity.</p></abstract><trans-abstract xml:lang="ru"><p>Изучение материалов из прибрежных биотопов озера Налычево (природный парк “Налычево”, Восточная Камчатка) с помощью сканирующей электронной микроскопии выявило 164 таксона диатомовых водорослей из 57 родов, в том числе новые для флоры России: Cocconeis pseudothumensis, Cymbopleura acutiformis, Encyonema subminutum, Gomphonema cf. khienticense, Witkowskia parvapolonica. 15 водорослей были определены только до рода: Achnanthidium, Amphora, Сaloneis, Fragilaria, Gomphonema, Navicula, Planothidium, Sellaphora, Witkowskia. Полученные данные в значительной степени расширяют таксономический спектр Bacillariophyta озера с 35 до 189 видов и разновидностей, а также родов с 18 до 58. Наиболее богатыми в таксономическом плане оказались роды Achnanthidium (8), Navicula (13) и Gomphonema (16). Экологический анализ флоры Bacillariophyta из биотопов с разновозрастными колониями эгагропилы показал, что подавляющее большинство найденных водорослей предпочитают пресные, слабощелочные водоемы. По видоспецифическому индексу сапробности обследованные участки литорали озера относятся к олигосапробным с элементами мезосапробности.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Bacillariophyta</kwd><kwd>Far East</kwd><kwd>Nalychevo Lake</kwd><kwd>Bacillariophyta</kwd><kwd>morphology</kwd><kwd>electron microscopy</kwd><kwd>ecological analysis</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>Дальний Восток</kwd><kwd>озеро Налычево</kwd><kwd>морфология</kwd><kwd>электронная микроскопия</kwd><kwd>экологический анализ</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Bahls L. 2014. Pinnularia nodosa var. percapitata. – In: Diatoms of North America. 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