Polar micro- and meiobenthos is resistant to prolonged light limitation: Mesocosm shading experiment in the White Sea intertidal

Azovsky, A.I.; Esaulov, A.S.; Saburova, M.A.; Garlitska, L.A.; Portnova, D.A.; Prokina, K.I.; Zagumyonnyi, D.G.; Tikhonenkov, D.V.; Mazei, N.G.; Udalov, A.A.; Chikina, M.V.; Mokievsky, V.O.; Li Xiaolei; Zhang, W.; Medvedev, A.F.; Grum-Grzhimaylo, O.A.; Bubnova, E.N.; Plotnikov, A.O.; Ivanovskii, A.A.; Tsyganov, A.N.; Saldaev, D.A.; Polikarpov, I.G.; Chernyshov, V.A.; Babeshko, K.V.; Burkovsky, I.V.; Mazei, Y.A.

Авторы: Azovsky Andrey I., Esaulov Anton S., Saburova Maria A., Garlitska Lesya A., Portnova Darya A., Prokina Kristina I., Zagumyonnyi Dmitri G., Tikhonenkov Denis V., Mazei Natalia G., Udalov Alexey A., Chikina Margarita V., Mokievsky Vadim O., Li Xiaolei, Zhang Wenjing, Medvedev Andrey F., Grum-Grzhimaylo Olga A., Bubnova Ekaterina N., Plotnikov Andrey O., Ivanovskii Alexander A., Tsyganov Andrey N., Saldaev Damir A., Polikarpov Igor G., Chernyshov Viktor A., Babeshko Kirill V., Burkovsky Igor V., Mazei Yuri A.
Журнал: Journal of Experimental Marine Biology and Ecology
Том: 594
Год издания: 2026
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 152149
DOI: 10.1016/j.jembe.2025.152149
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 (NH4+) 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.
Добавил в систему: Цыганов Андрей Николаевич

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