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Polar Micro- and Meiobentos is resistant to prolonged light limitation: Mesocosm shading experiment in the white sea intertidal
| Категория: | биология |
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| Авторы (ПГУ): | Есаулов Антон Сергеевич [100]  , Чернышов Виктор Александрович [0] | |
| Аннотация: | A natural micro- (ciliates, diatoms, flagellates) and meiobenthic (nematodes, harpacticoids) assemblage from the White Sea intertidal was used to study the effect of irradiance on the sustainability and species composition. Four treatments were maintained for two months: unshaded (control), lightly shaded (90 % light flux), semi-shaded (50 %), and completely shaded (darkness). Different groups of organisms displayed a variety of responses to the light conditions. Abundance and diversity of diatoms were not significantly affected by the light regime, except for the largest size class (>1000 μm3), which decreased in abundance fourfold. At the same time, redox potential and nitrate content decreased in the dark treated sediments, and the ratio of reduced (NH+ 4 ) to oxidized (NO3 + NO2 ) forms of nitrogen increased consistently, as the phaeopigments to chlorophyll a ratio. These results are consistent with the survival of small-to-medium-sized diatoms under dark and hypoxic conditions owing to switch their metabolic pathway from photosynthesis to dissimilatory nitrate reduction to ammonium (DNRA). Evidence was provided in support of less ability of large diatoms to stock nitrates intracellularly and employ DNRA. Other groups, both autotrophs (phytoflagellates) and heterotrophs (flagellates, ciliates, nematodes and harpacticoids) decreased in abundance under fully shaded conditions, whereas diversity and assemblage structure were less affected by shading. These changes, however, did not exceed the range of natural spatiotemporal variability observed at the site, indicating a pronounced resistance of the polar benthic community to two-month light limitation. | |
| Тип: | Статья | |
| Вид: | электронная копия бумажного издания | |
| Количество частей: | 1 | |
| Год издания: | 2025 | |
| Издательство: | ELSEVIER | |
| Где опубликовано: | Зарубежный журнал | |
| Место опубликования: | Journal of Experimental Marine Biology and Ecology | |
| Индексация: | Web of Science Core Collection Q2 (тип публикации Article) | |
| Целевая аудитория: | Исследователь | |
| Целевое назначение: | Научное | |
| Лицензия: | Нет ограничений | |
| Ограничения: | Нет ограничений | |
| Правообладатель: | Elsevier | |
| Библиографическая ссылка: | Azovsky, A. I. (2026). Polar Micro- and Meiobentos is resistant to prolonged light limitation: Mesocosm shading experiment in the white sea intertidal. | |
| Внешняя веб-ссылка: | https://www.sciencedirect.com/science/article/pii/S0022098125000693 | |
| Язык: | Русский | |
| Место хранения: | ИР открытого доступа | |
| Дата размещения: | 20.11.2025 | |
| Владелец: | Есаулов Антон Сергеевич | |
| Ссылка на ресурс: | http://elib.pnzgu.ru/library/1763641581  | |
| Формат: | Не указан |