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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">10.35885/1684-7318-2025-3-286-299</article-id><article-id custom-type="elpub" pub-id-type="custom">sevin-677</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><subj-group subj-group-type="section-heading" xml:lang="en"><subject>ARTICLES</subject></subj-group></article-categories><title-group><article-title>Трансформация фенологической нормы даты начала нерестовых миграций Bombina bombina и Pelophylax ridibundus (Amphibia, Anura) в среднем течении р. Медведица</article-title><trans-title-group xml:lang="en"><trans-title>Transformation of the phenological norm of the start date of spawning migrations of Bombina bombina and Pelophylax ridibundus (Amphibia, Anura) in the middle reach of the Medveditsa river</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-6377-6816</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Ермохин</surname><given-names>М. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Yermokhin</surname><given-names>M. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Михаил Валентинович Ермохин</p><p>биологический факультет; кафедра морфологии и экологии животных</p><p>410012; ул. Астраханская, д. 83; Саратов</p></bio><bio xml:lang="en"><p>Mikhail V. Yermokhin</p><p>Faculty of Biology; Department of Animal Morphology and Ecology</p><p>410012; 83 Astrakhanskaya St.; Saratov</p></bio><email xlink:type="simple">yermokhinmv@yandex.ru</email><xref ref-type="aff" rid="aff-1"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Табачишин</surname><given-names>В. В.</given-names></name><name name-style="western" xml:lang="en"><surname>Tabachishin</surname><given-names>V. V.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Василий Васильевич Табачишин</p><p>410012; ул. Астраханская, д. 83; Саратов</p></bio><bio xml:lang="en"><p>Vasiliy V. Tabachishin</p><p>410012; 83 Astrakhanskaya St.; Saratov</p></bio><email xlink:type="simple">vasya2000.t@yandex.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/0000-0002-9001-1488</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Табачишин</surname><given-names>В. Г.</given-names></name><name name-style="western" xml:lang="en"><surname>Tabachishin</surname><given-names>V. G.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Василий Григорьевич Табачишин</p><p>410028; ул. Рабочая, д. 24; Саратов</p></bio><bio xml:lang="en"><p>Vasily G. Tabachishin</p><p>410028; 24 Rabochaya St.; Saratov</p></bio><email xlink:type="simple">tabachishinvg@sevin.ru</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Саратовский национальный исследовательский государственный университет имени Н. Г. Чернышевского</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Saratov State University</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Саратовский филиал Института проблем экологии и эволюции им. А. Н. Северцова РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Saratov Branch of A. N. Severtsov Institute of Ecology and Evolution, Russian Academy of Sciences</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2025</year></pub-date><pub-date pub-type="epub"><day>04</day><month>11</month><year>2025</year></pub-date><volume>0</volume><issue>3</issue><fpage>286</fpage><lpage>299</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Ермохин М.В., Табачишин В.В., Табачишин В.Г., 2025</copyright-statement><copyright-year>2025</copyright-year><copyright-holder xml:lang="ru">Ермохин М.В., Табачишин В.В., Табачишин В.Г.</copyright-holder><copyright-holder xml:lang="en">Yermokhin M.V., Tabachishin V.V., Tabachishin V.G.</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/677">https://sevin.elpub.ru/jour/article/view/677</self-uri><abstract><p>   В 2023 – 2025 гг. проведен анализ дат окончания зимовки и начала нерестовых миграций жерлянки краснобрюхой и лягушки озерной на территории долины среднего течения р. Медведицы (бассейн Дона, Саратовская область). Установлено поступательное развитие весенних процессов в популяциях этих видов в 2024 г. и протекание их по типу ложной весны в 2023 и 2025 гг. Актуальные фенологические результаты были сопоставлены с ретроспективным временным рядом данных с 1892 по 2020 гг. методом реконструкции динамики среднедекадной температуры среды в зимовальных биотопах. Показана относительная стабильность фенологической нормы даты начал нерестовых миграций двух видов амфибий в период до начала эпохи глобального потепления (с 1892 по 1960 гг.), смещение этой даты на более ранние сроки в период с 1961 по 2020 гг. (на 5 сут.). В конце первой четверти XXI в. произошло резкое ускорение этого процесса (смещение на 10 сут. относительно актуальной фенологической нормы (среднее за 1991 – 2020 гг.)).</p></abstract><trans-abstract xml:lang="en"><p>   An analysis was carried out of the dates of the hibernation end and the beginning of spawning migrations of the fire-bellied toad and marsh frog in the valley of the middle reach of the Medveditsa river (Don basin, Saratov region) in 2023–2025. The progressive development of spring processes in the populations of these species in 2024 and their occurrence according to the false spring type in 2023 and 2025 were established. The current phenological results were compared with the retrospective time data series from 1892 to 2020 using the method of reconstructing the dynamics of the mean ten-day temperature of the environment in hibernation biotopes. The relative stability of the phenological norm of the date of the beginning of spawning migrations of the two amphibian species in the period before the onset of global warming (from 1892 to 1960) and a shift of this date to earlier dates in the period from 1961 to 2020 (by 5 days) are shown. At the end of the first quarter of the 21st century, there was a sharp acceleration of this process (a shift of 10 days relative to the current phenological norm (mean for 1991–2020)).</p></trans-abstract><kwd-group xml:lang="ru"><kwd>фенология</kwd><kwd>нерестовые миграции</kwd><kwd>бесхвостые амфибии</kwd><kwd>жерлянка краснобрюхая</kwd><kwd>лягушка озерная</kwd></kwd-group><kwd-group xml:lang="en"><kwd>phenology</kwd><kwd>spawning migrations</kwd><kwd>anuran amphibians</kwd><kwd>fire-bellied toad</kwd><kwd>marsh frog</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">Arietta A. Z. 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