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Effect of the Concentration Gradient of Organic Matter and Nutrients on the Spatial Structure of Mixotrophic Phytophlagellate Plankton of Large East Siberian Rivers

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Abstract

Using the methods of multivariate statistics, it was determined that the greatest species richness of mixotrophic river plankton in the region studied is characterized by the lower reaches of the Arctic rivers, and the maximum total density of mixotrophs is reached in the Kolyma Reservoir. It was found that among the complex of nutrients, ammonium ions, total iron, and total phosphorus had the strongest impact on the mixotrophs, and among the indices of organic matter, chemical oxygen consumption was most important. It is shown that the concentration of nutrients is more closely related to the total density of mixotrophs, and the content of organic matter is more closely related to the total number of species. The revealed dependence of the cell size of a number of mixotrophic species on the content of dissolved organic matter and nutrients is due to their feeding strategy.

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Funding

The research was carried out within the state assignment of the Ministry of Science and Higher Education of the Russian Federation (theme no. 0297-2021-0026, reg. no. AAAA-A21-121012190036-6).

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Correspondence to V. A. Gabyshev.

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The authors declare that they have no conflicts of interest. This article does not contain any studies involving animals or human participants performed by any of the authors.

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Gabyshev, V.A., Gabysheva, O.I. Effect of the Concentration Gradient of Organic Matter and Nutrients on the Spatial Structure of Mixotrophic Phytophlagellate Plankton of Large East Siberian Rivers. Biol Bull Russ Acad Sci 49, 36–42 (2022). https://doi.org/10.1134/S1062359022020078

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