Heterotrophic Bacterioplankton of the Laptev and East Siberian Sea Shelf Affected by Freshwater Inflow Areas

Abstract

The present study examined the hydrochemical and biological parameters influencing the spatial distribution of bacterioplankton in the Laptev Sea and the East Siberian Sea shelf regions affected by the Khatanga, Indigirka and Kolyma rivers runoff during September 2017. The highest bacterial abundance and the amount of actively respiring bacteria were determined in rivers delta and in surface water along the edge of continental shelf. Despite the expectations based on previous studies salinity was not the determining factor affecting spatial distribution and activity of bacterioplankton. Bacterial abundance and biomass were significantly and positively correlated with chlorophyll “a” and pheophytin content.

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Funding

This study was supported by the Russian Science Foundation (project no. 17-77-10138). The research was carried out as part of state task no. 0128-2019-0011.

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Correspondence to E. M. Bezzubova.

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Translated by A. Panyushkina

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Bezzubova, E.M., Seliverstova, A.M., Zamyatin, I.A. et al. Heterotrophic Bacterioplankton of the Laptev and East Siberian Sea Shelf Affected by Freshwater Inflow Areas. Oceanology 60, 62–73 (2020). https://doi.org/10.1134/S0001437020010026

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Keywords:

  • bacterioplankton
  • estuaries
  • Laptev Sea
  • East Siberian Sea
  • Arctic ecosystems
  • bacteria