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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">Samara Journal of Science</journal-id><journal-title-group><journal-title xml:lang="en">Samara Journal of Science</journal-title><trans-title-group xml:lang="ru"><trans-title>Самарский научный вестник</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2309-4370</issn><issn publication-format="electronic">2782-3016</issn><publisher><publisher-name xml:lang="en">Samara State University of Social Sciences and Education</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">676993</article-id><article-id pub-id-type="doi">10.55355/snv2024134103</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>Biological Sciences</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>Биологические науки</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">Isotopic composition of carbon (ẟ¹³C) and nitrogen (ẟ¹⁵N) in the hair of the order Rodentia of the Vologda Region</article-title><trans-title-group xml:lang="ru"><trans-title>Изотопный состав углерода (ẟ¹³C) и азота (ẟ¹⁵N) шерсти грызунов Вологодской области</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Eltsova</surname><given-names>Liubov Sergeevna</given-names></name><name xml:lang="ru"><surname>Ельцова</surname><given-names>Любовь Сергеевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>researcher of Biology Department</p></bio><bio xml:lang="ru"><p>научный сотрудник кафедры биологии</p></bio><email>lskhabarova@chsu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Duryagina</surname><given-names>Olga Vasilyevna</given-names></name><name xml:lang="ru"><surname>Дурягина</surname><given-names>Ольга Васильевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>student of Faculty of Biology and Human Health</p></bio><bio xml:lang="ru"><p>студент факультета биологии и здоровья человека</p></bio><email>ovduriagina@chsu.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Kuznetsova</surname><given-names>Liudmila Victorovna</given-names></name><name xml:lang="ru"><surname>Кузнецова</surname><given-names>Людмила Викторовна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>head of Environmental Management and Science Department</p></bio><bio xml:lang="ru"><p>начальник отдела организации природопользования и науки</p></bio><email>priroda.russever@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Ivanova</surname><given-names>Elena Sergeevna</given-names></name><name xml:lang="ru"><surname>Иванова</surname><given-names>Елена Сергеевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>candidate of biological sciences, leading researcher, head of Ecological and Analytical Laboratory of Biology Department</p></bio><bio xml:lang="ru"><p>кандидат биологических наук, ведущий научный сотрудник, руководитель эколого-аналитической лаборатории кафедры биологии</p></bio><email>stepinaelena@yandex.ru</email><xref ref-type="aff" rid="aff1"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">Cherepovets State University</institution></aff><aff><institution xml:lang="ru">Череповецкий государственный университет</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Russian North National Park</institution></aff><aff><institution xml:lang="ru">Национальный парк «Русский Север»</institution></aff></aff-alternatives><pub-date date-type="pub" iso-8601-date="2024-12-01" publication-format="electronic"><day>01</day><month>12</month><year>2024</year></pub-date><volume>13</volume><issue>4</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>20</fpage><lpage>25</lpage><history><date date-type="received" iso-8601-date="2025-03-10"><day>10</day><month>03</month><year>2025</year></date><date date-type="accepted" iso-8601-date="2025-03-10"><day>10</day><month>03</month><year>2025</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2024, Eltsova L.S., Duryagina O.V., Kuznetsova L.V., Ivanova E.S.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2024, Ельцова Л.С., Дурягина О.В., Кузнецова Л.В., Иванова Е.С.</copyright-statement><copyright-year>2024</copyright-year><copyright-holder xml:lang="en">Eltsova L.S., Duryagina O.V., Kuznetsova L.V., Ivanova E.S.</copyright-holder><copyright-holder xml:lang="ru">Ельцова Л.С., Дурягина О.В., Кузнецова Л.В., Иванова Е.С.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://snv63.ru/2309-4370/article/view/676993">https://snv63.ru/2309-4370/article/view/676993</self-uri><abstract xml:lang="en"><p> </p><p>The study is devoted to the analysis of the ratio of stable carbon isotopes (ẟ¹³C) and stable nitrogen isotopes (ẟ¹⁵N) in the hair of mammals of the Rodentia order (Eurasian beaver – <italic>Castor fiber</italic> Linnaeus, 1758; Ural field mouse – <italic>Apodemus uralensis</italic> Pallas, 1811; European water vole – <italic>Arvicola amphibius</italic> (Linnaeus, 1758); Muskrat – <italic>Ondatra zibethicus </italic>Linnaeus, 1766; Siberian chipmunk – <italic>Eutamias sibiricus</italic> (Laxmann, 1769); Siberian flying squirrel – <italic>Pteromys volans</italic> Linnaeus, 1758; Red squirrel – <italic>Sciurus vulgaris </italic>Linnaeus, 1758) in the Vologda Region. The isotopic composition of carbon in the hair of the studied animals varies from −28,2‰ to −17,9‰, nitrogen – from 0,4‰ to 10,6‰. The values of ẟ¹³C in the hair of mammals of the Rodentia order are higher, and ẟ¹⁵N is lower than in the hair of mammals of the Carnivora order, previously studied in the Vologda Region. The ratio of heavy carbon and nitrogen isotopes in the hair of animals captured in different regions of the Vologda Region does not differ significantly statistically. It has been established that the hair of aquatic organisms is less enriched in heavy carbon isotope and more enriched in heavy nitrogen isotope than the hair of terrestrial representatives of the Rodentia order. The hair of omnivores is more enriched in a heavy nitrogen isotope than the hair of herbivores. The overlap of isotopic niches in certain species of the Rodentia order has been revealed. A statistically significant decrease in the δ¹³C content in Muskrat hair by 2,7‰ over 50 years has been established.</p> </abstract><trans-abstract xml:lang="ru"><p> </p><p>Исследование посвящено анализу соотношения стабильных изотопов углерода (ẟ¹³C) и азота (ẟ¹⁵N) в шерсти млекопитающих отряда Грызуны (обыкновенный бобр – <italic>Castor fiber</italic> Linnaeus, 1758; лесная мышь – <italic>Apodemus uralensis</italic> Pallas, 1811; водяная крыса – <italic>Arvicola amphibius</italic> Linnaeus, 1758; ондатра – <italic>Ondatra zibethicus </italic>Linnaeus, 1766; азиатский бурундук – <italic>Eutamias sibiricus</italic> (Laxmann, 1769); обыкновенная летяга – <italic>Pteromys volans</italic> Linnaeus, 1758; обыкновенная белка – <italic>Sciurus vulgaris </italic>Linnaeus, 1758) на территории Вологодской области. Изотопный состав углерода в шерсти исследованных животных варьирует от −28,2‰ до −17,9‰, азота – от 0,4‰ до 10,6‰. Значения ẟ¹³C в шерсти млекопитающих отряда Грызуны выше, а ẟ¹⁵N ниже, чем в шерсти млекопитающих отряда Хищные, исследованных ранее на территории Вологодской области. Соотношение тяжелых изотопов углерода и азота в шерсти животных, отловленных в разных районах Вологодской области, статистически значимо не различается. Установлено, что шерсть гидробионтов менее обогащена тяжелым изотопом углерода и более обогащена тяжелым изотопом азота, чем шерсть наземных представителей отряда Грызуны. Шерсть всеядных грызунов более обогащена тяжелым изотопом азота, чем шерсть фитофагов. Выявлено перекрытие изотопных ниш у отдельных видов грызунов. Установлено статистически значимое снижение тяжелого изотопа углерода в шерсти ондатры на 2,7‰ за 50 лет.</p> </trans-abstract><kwd-group xml:lang="en"><kwd>isotopic ecology</kwd><kwd>δ¹³C</kwd><kwd>δ¹⁵N</kwd><kwd>wool</kwd><kwd>rodents</kwd><kwd>Vologda Region</kwd><kwd>trophic level</kwd><kwd>isotope niches</kwd><kwd>museum collections</kwd><kwd>isotope mass spectrometer</kwd><kwd>Castor fiber</kwd><kwd>Apodemus uralensis</kwd><kwd>Arvicola amphibius</kwd><kwd>Ondatra zibethicus</kwd><kwd>Eutamias sibiricus</kwd><kwd>Pteromys volans</kwd><kwd>Sciurus vulgaris</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>изотопная экология</kwd><kwd>δ¹³C</kwd><kwd>δ¹⁵N</kwd><kwd>шерсть</kwd><kwd>грызуны</kwd><kwd>Вологодская область</kwd><kwd>трофический уровень</kwd><kwd>изотопные ниши</kwd><kwd>музейные коллекции</kwd><kwd>изотопный масс-спектрометр</kwd><kwd>Castor fiber</kwd><kwd>Apodemus uralensis</kwd><kwd>Arvicola amphibius</kwd><kwd>Ondatra zibethicus</kwd><kwd>Eutamias sibiricus</kwd><kwd>Pteromys volans</kwd><kwd>Sciurus vulgaris</kwd></kwd-group><funding-group/></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>McCutchan J.H., Lewis W.M., Kendall С., McGrath C.C. 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