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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">10.35885/1684-7318-2022-1-34-54</article-id><article-id custom-type="elpub" pub-id-type="custom">sevin-329</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>Характеристика местообитаний дрофы (Otis tarda) (Otididae, Aves) в Заволжье по доступности кормовой базы в период выкармливания птенцов</article-title><trans-title-group xml:lang="en"><trans-title>Characteristics of the great bustard (Otis tarda) (Otididae, Aves) habitats in the Trans-Volga region according to food availability during the chick rearing period</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><contrib-id contrib-id-type="orcid">https://orcid.org/0000-0001-5581-4122</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Опарина</surname><given-names>О. С.</given-names></name><name name-style="western" xml:lang="en"><surname>Oparina</surname><given-names>O. S.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Опарина Ольга Сергеевна</p><p>410028, г. Саратов, ул. Рабочая, д. 24</p></bio><bio xml:lang="en"><p>Olga S. Oparina</p><p>24 Rabochaya St., Saratov 410028</p></bio><email xlink:type="simple">otis07@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/0000-0002-9629-7579</contrib-id><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Опарин</surname><given-names>М. Л.</given-names></name><name name-style="western" xml:lang="en"><surname>Oparin</surname><given-names>M. L.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Опарин Михаил Львович</p><p>410028, г. Саратов, ул. Рабочая, д. 24</p></bio><bio xml:lang="en"><p>Mikhail L. Oparin</p><p>24 Rabochaya St., Saratov 410028</p></bio><email xlink:type="simple">oparinml@mail.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>Кудрявцев</surname><given-names>А. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Kudryavtsev</surname><given-names>A. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Кудрявцев Алексей Ювенальевич</p><p>410028, г. Саратов, ул. Рабочая, д. 24</p></bio><bio xml:lang="en"><p>Alexey Yu. Kudryavtsev</p><p>24 Rabochaya St., Saratov 410028</p></bio><email xlink:type="simple">akydtaks@mail.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>Опарина</surname><given-names>А. М.</given-names></name><name name-style="western" xml:lang="en"><surname>Oparina</surname><given-names>A. M.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Опарина Анна Михайловна</p><p>410054, г. Саратов, ул. Политехническая, д. 77</p></bio><bio xml:lang="en"><p>Anna M. Oparina</p><p>77 Politechnicheskaya St., Saratov 410054</p></bio><email xlink:type="simple">annaoparina93@gmail.com</email><xref ref-type="aff" rid="aff-2"/></contrib></contrib-group><aff-alternatives id="aff-1"><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><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Саратовский государственный технический университет имени Гагарина Ю. А.</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Yuri Gagarin State Technical University of Saratov</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2022</year></pub-date><pub-date pub-type="epub"><day>13</day><month>06</month><year>2022</year></pub-date><volume>0</volume><issue>1</issue><fpage>34</fpage><lpage>54</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Опарина О.С., Опарин М.Л., Кудрявцев А.Ю., Опарина А.М., 2022</copyright-statement><copyright-year>2022</copyright-year><copyright-holder xml:lang="ru">Опарина О.С., Опарин М.Л., Кудрявцев А.Ю., Опарина А.М.</copyright-holder><copyright-holder xml:lang="en">Oparina O.S., Oparin M.L., Kudryavtsev A.Y., Oparina A.M.</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/329">https://sevin.elpub.ru/jour/article/view/329</self-uri><abstract><p>Представлены результаты исследований потенциальных участков гнездования дроф в саратовском Заволжье. Дана характеристика растительных сообществ, а также количественного и качественного состава членистоногих на этих участках. Приведены конкретные материалы, полученные в 2017 – 2021 гг. на 6 участках: посевы озимой пшеницы, проса, подсолнечника, залежи разного возраста, молодая (2-я стадия) и старая, целина. Приведено сравнение полученных результатов с данными прошлых лет. Полученные результаты о состоянии кормовой базы дроф позволяют сделать вывод о том, что фактически произошла потеря птицами этого вида гнездовых местообитаний. Те участки, где, несмотря на снижение обилия насекомых, все же имеется достаточное их количество для выкармливания птенцов, не используются дрофами в качестве гнездовых стаций. Это залежи разного возраста и целина. Отсутствие достаточного количества членистоногих, необходимых для выкармливания птенцов, в тех местах, где дрофы предпочитают гнездиться, а именно посевы различных культур, приводит к катастрофическим последствиям для размножения, а следовательно, и выживания вида. Количество крупных прямокрылых и жуков, отражающих показатели биомассы, снизилось в посевах озимых в 10 раз по сравнению с 2000 г., в период экстенсивного сельского хозяйства. Интенсификация сельскохозяйственного производства, применение пестицидов на посевах различных культур, а также изменение структуры севооборота являются основными причинами недостаточной кормовой базы в период выкармливания птенцов. Полученные результаты дают основание считать, что численность дроф продолжит сокращаться из-за невозможности поднять на крыло свое потомство в результате недостатка кормовой базы.</p></abstract><trans-abstract xml:lang="en"><p>The results of our studies of potential nesting sites for bustards in the Saratov Trans-Volga region are presented. Characteristics of plant communities, as well as the quantitative and qualitative composition of arthropods in these areas, are given. Specific materials obtained in 2017–2021 at 6 plots are given, namely: crops of winter wheat, millet, and sunflower; fallows of various ages; and young (2nd stage) and old virgin lands. The obtained results are compared with the data of previous years. The obtained results on the state of the forage base of bustards allow us to conclude that loss of nesting habitats by birds of this species has actually occurred. Those areas, where, despite the decrease in the abundance of insects, there are still enough of them to feed the chicks, are not used by bustards as nesting stations. These are fallows of various ages and virgin lands. The lack of a sufficient number of arthropods necessary for feeding chicks in those places where bustards prefer to nest, namely, cereals crops, leads to catastrophic consequences for reproduction, and, consequently, the survival of the species. The numbers of large orthoptera and beetles in winter crops, reflecting biomass indicators, have decreased by 10 times compared to 2000, during the period of extensive agriculture. The intensification of agricultural production, the use of pesticides on various crops, as well as the change in the structure of crop rotation are the main causes for the insufficient food supply during the period of rearing chicks. The results obtained give grounds to believe that the number of bustards will continue to decline due to the inability to raise their offspring as a result of the lack of food supply.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>дрофа</kwd><kwd>местообитания</kwd><kwd>кормовая база</kwd><kwd>растительные сообщества</kwd><kwd>членистоногие</kwd><kwd>обилие</kwd><kwd>биомасса</kwd><kwd>Заволжье</kwd></kwd-group><kwd-group xml:lang="en"><kwd>bustard</kwd><kwd>habitats</kwd><kwd>food base</kwd><kwd>plant communities</kwd><kwd>arthropods</kwd><kwd>abundance</kwd><kwd>biomass</kwd><kwd>Trans-Volga region</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">Костина Н. В. Применение индексов сходства и различия для районирования террито- рий на основе локальных флор // Известия Самарского научного центра РАН. 2013. Т. 15, № 3. 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