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Heterotrophic Bacteria of the Ob River Estuary during Growing Season: Spatial and Temporal Variability

  • MARINE BIOLOGY
  • Published:
Oceanology Aims and scope

Abstract

Analysis of the distribution of abundance and activity of bacterioplankton in the estuary area of the Ob River in July 2016 and September 2013, as well as environmental factors, made it possible to distinguish between riverine, brackish water, and marine zones. In summer, the abundance of bacterioplankton varied from 2604 ± 436 × 103 cells/mL in brackish waters to 468 ± 91 × 103 cells/mL in seawater. The average values of bacterial production in waters with a salinity of less than 8 and more than 22 PSU were 17.43 and 4.91 mgC m–3 day–1, respectively. In autumn, the bacterial abundance decreased towards the sea from 1289 ± 385 × 103 cells/mL in freshwaters to 85 ± 37 × 103 cells/mL in the offshore part; the value of production decreased by more than an order of magnitude. With an increase in salinity, the proportion of cells with active electron transport chain in the abundance of bacterioplankton decreased from 5.8 to 0.6%. Thus, the distribution of river runoff, marked by salinity, proved to be the main factor affecting the spatial distribution and activity of bacterioplankton. However, the mechanism of such regulation remains unclear.

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Funding

This research was carried out within state task no. 0128-2021-0007 and supported by the Russian Science Foundation, project nos. 17-77-10138 (treatment of bacterioplankton samples) and 19-17-00196 (analysis of hydrochemical parameters).

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Authors and Affiliations

  1. Shirshov Institute of Oceanology, Russian Academy of Sciences, 117997, Moscow, Russia

    N. D. Romanova, A. A. Polukhin, E. M. Bezzubova & S. A. Shchuka

  2. Murmansk Marine Biological Institute, Kola Scientific Centre, Russian Academy of Sciences, 183010, Murmansk, Russia

    M. A. Boltenkova

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  1. N. D. Romanova
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Correspondence to N. D. Romanova.

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Translated by A. Panyushkina

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Romanova, N.D., Boltenkova, M.A., Polukhin, A.A. et al. Heterotrophic Bacteria of the Ob River Estuary during Growing Season: Spatial and Temporal Variability. Oceanology 62, 369–378 (2022). https://doi.org/10.1134/S0001437022030109

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