Размерно-возрастная структура популяции Monoporeia affinis (Amphipoda) в Петрозаводской губе Онежского озераТруды Зоологического института РАН, 2023, 327(3): 468–477 · https://doi.org/10.31610/trudyzin/2023.327.3.468 Резюме Петрозаводская губа Онежского озера характеризуется благоприятными температурными, кормовыми и кислородными условиями для функционирования популяции реликтовых ракообразных Monoporeia affinis (Lindström, 1855), для которой впервые выполнен анализ размерно-возрастной структуры. В 2018 г. весеннее и осеннее состояние популяции M. affinis различалось, главным образом, по вкладу в общую численность молодых рачков с длиной тела 1.5–2.0 мм и 2.1–3.0 мм. Количество особей этих двух размерных групп изменялось обратно пропорционально с мая по сентябрь, что характеризует процесс роста молоди. Суммарный вклад молодых рачков в общую численность популяции на разных станциях варьировал в пределах 40–50% в мае и 20–40% в сентябре. На основе анализа размерно-частотных гистограмм и использования метода главных компонент были выделены две возрастных когорты рачков с длиной тела 3.1–7.0 мм (первая когорта, возраст 1 год) и 7.1–10.0 мм (вторая когорта, возраст 2 года). По вкладу в общую численность популяции M. affinis доля первой когорты в среднем составляла 12% в мае и сентябре. Доля второй когорты в мае составляла в среднем 2%, а в сентябре увеличивалась до 8%. Полученные данные хорошо согласуются с существованием двух возрастных когорт M. affinis в других озерах Карелии. Ключевые слова Онежское озеро, размерно-возрастная структура, реликтовые ракообразные, содержание кислорода, температура воды, трофические условия, Amphipoda, Monoporeia affinis Поступила в редакцию 31 января 2023 г. · Принята в печать 20 июня 2023 г. · Опубликована 25 сентября 2023 г. Литература Alekseev V.R. and Tsalolikhin S.Ya. 2016. Identification guide of zooplankton and zoobenthos of fresh waters of European Russia. Vol. 2. Zoobenthos. 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