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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">sapi</journal-id><journal-title-group><journal-title xml:lang="ru">Системный анализ и прикладная информатика</journal-title><trans-title-group xml:lang="en"><trans-title>«System analysis and applied information science»</trans-title></trans-title-group></journal-title-group><issn pub-type="ppub">2309-4923</issn><issn pub-type="epub">2414-0481</issn><publisher><publisher-name>Belarusian National Technical University</publisher-name></publisher></journal-meta><article-meta><article-id custom-type="elpub" pub-id-type="custom">sapi-85</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>Системный анализ</subject></subj-group><subj-group subj-group-type="section-heading" xml:lang="en"><subject>System analysis</subject></subj-group></article-categories><title-group><article-title>НЕУСТОЙЧИВОЕ КРИТИЧЕСКОЕ РАВНОВЕСИЕ В ДИНАМИКЕ СЛОЖНО-СТРУКТУРИРОВАННОЙ ПОПУЛЯЦИИ ОСЕТРОВЫХ РЫБ</article-title><trans-title-group xml:lang="en"><trans-title>UNSTABLE CRITICAL EQUILIBRIUM IN THE DYNAMICS OF COMPLEX STRUCTURED POPULATION OF STURGEON</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Дубровская</surname><given-names>В. А.</given-names></name><name name-style="western" xml:lang="en"><surname>Dubrovskaya</surname><given-names>V. A.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Дубровская Виктория Андреевна - аспирант</p></bio><bio xml:lang="en"><p>Post-graduate student</p></bio><email xlink:type="simple">CA_PI@bntu.by</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>Соловьева</surname><given-names>Т. Н.</given-names></name><name name-style="western" xml:lang="en"><surname>Solovieva</surname><given-names>T. N.</given-names></name></name-alternatives><bio xml:lang="ru"><p>Соловьева Татьяна Николаевна – кандидат технических наук, старший преподаватель кафедры вычислительных систем и сетей СПб ГУАП</p></bio><bio xml:lang="en"><p>Doctor of Engineering, Senior Lecturer</p></bio><email xlink:type="simple">CA_PI@bntu.by</email><xref ref-type="aff" rid="aff-2"/></contrib><contrib contrib-type="author" corresp="yes"><name-alternatives><name name-style="eastern" xml:lang="ru"><surname>Переварюха</surname><given-names>А. Ю.</given-names></name><name name-style="western" xml:lang="en"><surname>Perevaryukha</surname><given-names>A. Yu.</given-names></name></name-alternatives><bio xml:lang="ru"/><bio xml:lang="en"><p>Doctor of Engineering, Senior Researcher</p></bio><email xlink:type="simple">CA_PI@bntu.by</email><xref ref-type="aff" rid="aff-1"/></contrib></contrib-group><aff-alternatives id="aff-1"><aff xml:lang="ru"><institution>Санкт-Петербургский институт информатики и автоматизации РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Saint-Petersburg Institute for Informatics and Automation of RAS</institution><country>Russian Federation</country></aff></aff-alternatives><aff-alternatives id="aff-2"><aff xml:lang="ru"><institution>Санкт-Петербургский государственный университет аэрокосмического приборостроения; &#13;
Санкт-Петербургский институт информатики и автоматизации РАН</institution><country>Россия</country></aff><aff xml:lang="en"><institution>Saint-Petersburg State University of Aerospace Instrumentation; &#13;
Saint-Petersburg Institute for Informatics and Automation of RAS</institution><country>Russian Federation</country></aff></aff-alternatives><pub-date pub-type="collection"><year>2016</year></pub-date><pub-date pub-type="epub"><day>28</day><month>03</month><year>2016</year></pub-date><volume>0</volume><issue>1</issue><fpage>11</fpage><lpage>22</lpage><permissions><copyright-statement>Copyright &amp;#x00A9; Дубровская В.А., Соловьева Т.Н., Переварюха А.Ю., 2016</copyright-statement><copyright-year>2016</copyright-year><copyright-holder xml:lang="ru">Дубровская В.А., Соловьева Т.Н., Переварюха А.Ю.</copyright-holder><copyright-holder xml:lang="en">Dubrovskaya V.A., Solovieva T.N., Perevaryukha A.Y.</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://sapi.bntu.by/jour/article/view/85">https://sapi.bntu.by/jour/article/view/85</self-uri><abstract><p>В статье рассматриваются последствия существования особых состояний, определяющих стремительный характер дальнейшего развития популяционных процессов. Вероятна связь подобных критических состояний с оптимальной численностью субпопуляционных объединений, образующихся при эволюционной адаптации вида с ограниченным доступом к ресурсам для размножения. Предложена модель популяционного процесса, формализующая влияние неравномерной скорости роста у двух различных репродуктивных групп на смертность мигрирующих рыб в ювенальный период развития. В вычислительной среде исследована гибридная система, описывающая последствия существования для популяции ситуации непропорционального снижения мигрирующей молоди в реке, установленной нами по данным стремительного сокращения нереста волжского осетра. Для эксплуатируемой популяции пороговый эффект после неустойчивого равновесия с минимально необходимой для благополучного размножения вида численностью служит отсчетом реализации «коллапса». Известен ряд примеров подобного особого сценария длительной деградации наиболее ценной для промысла репродуктивной группы. Помимо явного резкого сокращения эффективности воспроизводства, пороговый эффект при коллапсе отражается в неблагоприятном проявлении доминировавшего ранее эволюционного тренда для выживаемости отдельных форм жизненного цикла рыб в условиях реорганизации промысла. Интересно, что для волжской севрюги наблюдается иная форма нелинейности по сведениям об эффективности нереста.</p></abstract><trans-abstract xml:lang="en"><p>The article deals with the consequences of the existence of special conditions that determine the character of the rapid further development of population processes. The most probable connection of these critical conditions deals with the optimal number of subpopulation groups. These groups are formed by the evolutionary adaptation of the form of restricted access to resources for reproduction. We have proposed a model of population processes, which formalizes the influence of uneven growth rate for two different groups of reproductive sturgeon mortality of migratory fish in the juvenile period of Acipenser gueldenstaedtii development. In the computing environment was investigated the hybrid system, which simulates the effects of the existence of the situation for the population of migrating juvenile disproportionate reduction in the river. Such cases are established by us according to the rapid decline in sturgeon spawning the Volga. For the exploited population threshold effect after the unstable equilibrium with the minimum necessary for the well being of the form number is the count in the implementation of the «collapse». The phenomenon of collapse detached among all scenarios the most valuable long-term degradation of the reproductive group. In addition to the apparent sharp reduction in reproductive performance, threshold effect is reflected in the adverse events previously dominated evolutionary trend for the survival of certain forms of the life cycle of fish in terms of reorganization of the fishery. Informative, that the Volga stellate sturgeon Acipencer stellatus observed some form of non-linearity in the efficiency of spawning and require a different kind of fish-specific mathematical model.</p></trans-abstract><kwd-group xml:lang="ru"><kwd>модели популяций</kwd><kwd>репродуктивный цикл</kwd><kwd>критические состояния</kwd><kwd>сценарий коллапса промысловых запасов</kwd></kwd-group><kwd-group xml:lang="en"><kwd>population models</kwd><kwd>reproductive cycle</kwd><kwd>critical states</kwd><kwd>collapse of the Caspian sea sturgeon stocks</kwd></kwd-group><funding-group><funding-statement xml:lang="ru">Российский фонд фундаментальных исследований</funding-statement></funding-group></article-meta></front><back><ref-list><title>References</title><ref id="cit1"><label>1</label><citation-alternatives><mixed-citation xml:lang="ru">Costello C., Gaines S. D., Lynham J. 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