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Bloom of Euglena sp. (Euglenophyceae, Euglenales) in the Outer Part of the Ob River Estuary

  • MARINE BIOLOGY
  • Published:
Oceanology Aims and scope

Abstract

The material was obtained on July 18–24, 2016 in the area comprising the Ob River estuary and the adjacent shelf of the Kara Sea (71°28.3′–74°38.8′ N). Euglena sp. bloom (class Euglenophyceae, order Euglenales), unique for estuarine regions of large Siberian rivers and the Arctic shelf, is described and quantitatively characterized. Bloom was clearly confined to the outer wide part of the Ob River estuary. In the areas of maximum abundance of Euglena sp., its average population density reached 2.9 × 106 cells/L in the water column; this species accounted for more than 80% of the total phytoplankton abundance; the share of spores in total abundance did not exceed 2.5%. The shallow shelf adjacent to the Ob River estuary was the area of Euglena sp. removal, as evidenced by a more than fourfold decrease in the abundance of this species and the predominance of spores in the population (75–98%). Euglena sp. bloom was associated exclusively with the outer part of the Ob River estuary. The dominance of this species in the phytoplankton community of this area made it possible to report for the first time on the presence of a specific quantitatively rich phytocoenose, developing under certain conditions and confined to the estuary of a large Arctic river.

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ACKNOWLEDGMENTS

The authors are grateful to A.G. Boev for the electronic photographs taken for this article and to the reviewer comments that helped to improve the text.

Funding

The study was carried out within State Task no. FMWE 2021-0007. The expedition was supported by target financing by the Ministry of Science and Higher Education of the Russian Federation.

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Authors and Affiliations

  1. Shirshov Institute of Oceanology, Russian Academy of Sciences, Moscow, Russia

    I. N. Sukhanova & M. V. Flint

Authors
  1. I. N. Sukhanova
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  2. M. V. Flint
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Correspondence to M. V. Flint.

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The authors declare that they have no conflicts of interest.

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Translated by D. Martynova

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Sukhanova, I.N., Flint, M.V. Bloom of Euglena sp. (Euglenophyceae, Euglenales) in the Outer Part of the Ob River Estuary. Oceanology 62, 510–516 (2022). https://doi.org/10.1134/S0001437022040129

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  • DOI: https://doi.org/10.1134/S0001437022040129

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