Microbial processes of organic matter production and decomposition in saline rivers of the Lake Elton area (Volgograd oblast, Russia)


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The rates of microbial processes and phylogenetic diversity of the microorganisms responsible for organic matter production and decomposition in the benthic communities and bottom sediments of the rivers Solyanka, Lantsug, Khara, Chernavka, and Bol’shaya Smorogda (Lake Elton area, Volgograd oblast, Russia) were studied. The biomass and primary production of cyano–bacterial communities varied significantly within the ranges of 20–903 mg Chl a/m2 and 0.2–21 mg C/(m2 h), respectively. Depending on the season, the share of anoxygenic CO2 fixation varied from 20% to the values comparable to the rate of oxygenic photosynthesis. The total heterotrophic activity of microbial communities determined as the rate of dark CO2 assimilation varied from 31 to 750 μmol/(dm3 day) in the mats and from 3 to 137 μmol/(dm3 day) in the sediments. The rates of sulfate reduction and hydrogenotrophic methanogenesis varied from 10 to 2621 μmol S/dm3 day) and from 1.5 to 323 nmol CH4/(dm3 day), respectively. High-throughput sequencing of the 16S rRNA genes in cyano–bacterial mats revealed microorganisms belonging to 20 phyla, with the sequences of Cyanobacteria, Proteobacteria, and Bacteroidetes being the most numerous.

作者简介

T. Kanapatskiy

Winogradsky Institute of Microbiology, Research Center of Biotechnology

编辑信件的主要联系方式.
Email: timkanap_inmi@mail.ru
俄罗斯联邦, Moscow

O. Samylina

Winogradsky Institute of Microbiology, Research Center of Biotechnology

Email: timkanap_inmi@mail.ru
俄罗斯联邦, Moscow

A. Plotnikov

Institute for Cellular and Intracellular Symbiosis, Ural Branch; Orenburg State Medical University

Email: timkanap_inmi@mail.ru
俄罗斯联邦, Orenburg; Orenburg

E. Selivanova

Institute for Cellular and Intracellular Symbiosis, Ural Branch

Email: timkanap_inmi@mail.ru
俄罗斯联邦, Orenburg

Yu. Khlopko

Institute for Cellular and Intracellular Symbiosis, Ural Branch

Email: timkanap_inmi@mail.ru
俄罗斯联邦, Orenburg

A. Kuznetsova

Winogradsky Institute of Microbiology, Research Center of Biotechnology

Email: timkanap_inmi@mail.ru
俄罗斯联邦, Moscow

I. Rusanov

Winogradsky Institute of Microbiology, Research Center of Biotechnology

Email: timkanap_inmi@mail.ru
俄罗斯联邦, Moscow

E. Zakharova

Winogradsky Institute of Microbiology, Research Center of Biotechnology

Email: timkanap_inmi@mail.ru
俄罗斯联邦, Moscow

N. Pimenov

Winogradsky Institute of Microbiology, Research Center of Biotechnology

Email: timkanap_inmi@mail.ru
俄罗斯联邦, Moscow

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