Microbiological composition of river waters in the Ob’ basin (West Siberia) and its associations with hydrochemical indices

The relevance of the contemporary landscape-ecological and biogeochemical studies of the Ob floodplain

“…The most important scientific generalizations at different times were carried out by VA Zemtsov, OG Savichev, VP Bolotnov, OA Alekhin, J.-M Martin, IA Shiklomanov, SL Shvartsev and other authors . The biogeochemistry was studied by OS Pokrovsky, SN Vorobyev, DV Moskovchenko, OV Serebrinnikova, MA Zdvizhkov and OS Naimushina [28][29][30][31][32]. Scientists, studying chemical composition of the Ob basin water, were VV Paromov, LI Inisheva, NG Inishev and EYu Pasechnik [33][34][35][36][37].…”

“…It is determining the nature and timing of interactions within the "water-rocks" system and consequently the correlation of processes of accumulation and removal of substances from different components of the environment. In connection with the local sources of matter, the correlation makes the hydrochemical "background" in the Ob basin [8,9,32].…”

“…Total organic carbon in the region river waters is strongly varied, a wide range from 3-4 mg/dm 3 [32]. Several categories of the major and trace elements were distinguished by their affinity to DOC.…”

“…3) chemoorganotrophic bacteria; 4) denitrifying bacteria, which are able to reduce nitrates to gas; 5) nitrifying bacteria -autotrophic microorganisms receiving energy due to oxidation of deoxidized nitrogen compounds; 6) ammonifying bacteria, which decompose complex nitrogen containing organic compounds (proteins, amino acids and a number of various substances), resulting in ammonia, hydrogen sulphide and carbon dioxide isolation; 7) thionic bacteria, which receive energy due to oxidation of sulphur and its reduced compounds; 8) sulphate-reducing bacteria -anaerobic microorganisms, which are able to reduce sulphates to sulphides when in use metabolism [32].…”

Selective cultivation of bacterial strains with lipolytic and hydrocarbon-oxidizing activity from bottom sediments of the Ob River, Western Siberia

“…Kosolapov investigated distribution of bacterioplankton in the lower reaches of the Ob River and provided measurements of the specific growth rate, and the abundance and distribution of biomass in different parts of the river (Kopylov, Kosolapov, 2011). Other works related to microbiological monitoring of the Ob River studied the abundance and distribution of some metabolic groups of mic roorganisms (Savichev et al, 2015), including those resistant to antibiotics and phenol (Shornikova, Arslanova, 2020). Yet the species diversity and physiological characteristics of the native microflora have been poorly studied.…”