scholarly journals Functional properties of bacterial communities in water and sediment of the eutrophic river-lake system of Poyang Lake, China

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e7318 ◽  
Author(s):  
Ze Ren ◽  
Xiaodong Qu ◽  
Wenqi Peng ◽  
Yang Yu ◽  
Min Zhang
Keyword(s):  
Sulfate Reduction ◽  
Water Column ◽  
Nitrogen Metabolism ◽  
Nitrate Reduction ◽  
Bacterial Communities ◽  
Poyang Lake ◽  
Functional Redundancy ◽  
Biogeochemical Processes ◽  
Phosphorus Cycle ◽  
Eutrophic River

In river-lake systems, sediment and water column are two distinct habitats harboring different bacterial communities which play a crucial role in biogeochemical processes. In this study, we employed Phylogenetic Investigation of Communities by Reconstruction of Unobserved States to assess the potential functions and functional redundancy of the bacterial communities in sediment and water in a eutrophic river-lake ecosystem, Poyang Lake in China. Bacterial communities in sediment and water had distinct potential functions of carbon, nitrogen, and sulfur metabolisms as well as phosphorus cycle, while the differences between rivers and the lake were inconspicuous. Bacterial communities in sediment had a higher relative abundance of genes associated with carbohydrate metabolism, carbon fixation pathways in prokaryotes, methane metabolism, anammox, nitrogen fixation, and dissimilatory sulfate reduction than that of water column. Bacterial communities in water column were higher in lipid metabolism, assimilatory nitrate reduction, dissimilatory nitrate reduction, phosphonate degradation, and assimilatory sulfate reduction than that of sediment bacterial communities. Furthermore, the variations in functional composition were closely associated to the variations in taxonomic composition in both habitats. In general, the bacterial communities in water column had a lower functional redundancy than in sediment. Moreover, comparing to the overall functions, bacterial communities had a lower functional redundancy of nitrogen metabolism and phosphorus cycle in water column and lower functional redundancy of nitrogen metabolism in sediment. Distance-based redundancy analysis and mantel test revealed close correlations between nutrient factors and functional compositions. The results suggested that bacterial communities in this eutrophic river-lake system of Poyang Lake were vulnerable to nutrient perturbations, especially the bacterial communities in water column. The results enriched our understanding of the bacterial communities and major biogeochemical processes in the eutrophic river-lake ecosystems.

scholarly journals Niche partitioning of bacterial communities along the stratified water column in the Black Sea

2021 ◽  
Vol 10 (3) ◽  
Author(s):  
Mariia Pavlovska ◽  
Ievgeniia Prekrasna ◽  
Evgen Dykyi ◽  
Andrii Zotov ◽  
Artem Dzhulai ◽  
...  
Keyword(s):  
Water Column ◽  
Black Sea ◽  
Bacterial Communities ◽  
Niche Partitioning ◽  
The Black Sea

scholarly journals Advanced experimental approaches to marine water-column biogeochemical processes

2017 ◽  
Vol 75 (1) ◽  
pp. 30-42 ◽  
Author(s):  
Louis Legendre ◽  
Richard B Rivkin ◽  
Nianzhi Jiao
Keyword(s):  
Water Column ◽  
Numerical Models ◽  
Free Water ◽  
Sea Surface ◽  
Biogeochemical Processes ◽  
In Situ Experiments ◽  
Technological Developments ◽  
Approaches To Study ◽  
Experimental Approaches

Abstract This “Food for Thought” article examines the potential uses of several novel scientific and technological developments, which are currently available or being developed, to significantly advance or supplement existing experimental approaches to study water-column biogeochemical processes (WCB-processes). After examining the complementary roles of observation, experiments and numerical models to study WCB-processes, we focus on the main experimental approaches of free-water in situ experiments, and at-sea and on-land meso- and macrocosms. We identify some of the incompletely resolved aspects of marine WCB-processes, and explore advanced experimental approaches that could be used to reduce their uncertainties. We examine three such approaches: free-water experiments of lengthened duration using bioArgo floats and gliders, at-sea mesocosms deployed several 100s m below the sea-surface using new biogeochemical sensors, and 50 m-tall on-land macrocosms. These approaches could lead to significant progress in concepts related to marine WCB-processes.

Biogeochemical processes in the Barents sea

2021 ◽  
pp. 287-306
Author(s):  
A.Yu. Lein ◽  
◽  
A.S. Savvichev ◽  
Keyword(s):  
Organic Matter ◽  
Water Column ◽  
Methane Concentration ◽  
Barents Sea ◽  
Biogeochemical Processes ◽  
Total Abundance ◽  
The North ◽  
The Barents Sea ◽  
Continental Origin ◽  
Biomass Of Microorganisms

Biogeochemical processes involving microorganisms play an important role in marine sedimentogenesis. The study of biogeochemical processes in the Barents Sea was carried out from 1997 with interruptions until 2019. Using a complex of geological-geochemical, microbiological, radioisotope and stable isotope methods, it was possible to obtain a quantitative estimate of the total abundance and biomass of microorganisms, rates of biogeochemical processes, methane content and organic matter suspended. In the course of work in four expeditions, it was found that in the surface (0–10 m) water column south of 74° N the magnitude of the total abundance and the biomass of microorganisms increased by 2019 by about 5 times compared to 1998. To the north, in colder waters, the total abundance and the biomass of organisms were lower than in the southern region of the sea. The methane concentration in the surface layer of the water column at the border with the atmosphere did not change much for 20 years (1976–1997) and increased noticeably from 1997 to 2017, from 3.3 to 15.8 nM. The increase in FFM, the biomass of organisms and the concentration of methane in the water column is associated with the melting of glaciers, with the release of organic matter of continental origin released from ice into the water. The results of the work indicate changes in the ecosystem of the Barents Sea.

Vertical and horizontal assemblage patterns of bacterial communities in a eutrophic river receiving domestic wastewater in southeast China

2017 ◽  
Vol 230 ◽  
pp. 469-478 ◽  
Author(s):  
Yan Gao ◽  
Chengcheng Wang ◽  
Weiguo Zhang ◽  
Panpan Di ◽  
Neng Yi ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Domestic Wastewater ◽  
Southeast China ◽  
Eutrophic River

scholarly journals Identification of bacterial communities in sediments of Poyang Lake, the largest freshwater lake in China

SpringerPlus ◽  
2016 ◽  
Vol 5 (1) ◽  
Author(s):  
Wenbo Kou ◽  
Jie Zhang ◽  
Xinxin Lu ◽  
Yantian Ma ◽  
Xiaozhen Mou ◽  
...  
Keyword(s):  
Bacterial Communities ◽  
Poyang Lake ◽  
Freshwater Lake

scholarly journals Microscale effects of oxygen and light on bacterial sulfate reduction in organic-rich lacustrine sediments

2019 ◽  
Vol 98 ◽  
pp. 11004
Author(s):  
Alfonso Menchén ◽  
Nicolas Valiente ◽  
Beatriz Toledo ◽  
Juan José Gómez-Alday
Keyword(s):  
Sulfate Reduction ◽  
Water Column ◽  
Redox Reactions ◽  
Lacustrine Sediments ◽  
Chemical Species ◽  
Bacterial Sulfate Reduction ◽  
Se Spain ◽  
Reduction Processes ◽  
Anoxic Zones ◽  
Sediment Interface

Biogeochemical cycling involves the exchange of electrons between chemical species through redox reactions. Microorganisms can utilize energy released by redox reactions for their metabolism following a thermodynamic sequence. Among these reactions, the dissimilatory reduction of sulfate (SO42−) to produce hydrogen sulfide (H2S) is one of the most important microbially-mediated pathways. The use of microelectrodes at the water-sediment interface provided a better understanding of sulfate reduction processes in the suboxic and anoxic zones. The goal of this study was to assess the microzonation of H2S and O2 under different conditions of light and oxygen in the water column. For this purpose, organic-rich lacustrine sediments from Pétrola Lake (SE Spain) were used. Sediment incubations were performed in mesocosm devices. The highest production of H2S (up to 0.36 nmol/cm-3s-1) was observed under anoxic and dark conditions. Production under those conditions was several orders of magnitude higher than those measured when oxygen was present in the water column. Furthermore, the absence of O2 in the water column significantly altered the microzonation of H2S in depth. The absence of light seems not to affect the dynamics of O2 and H2S in depth. The study contributes to our understanding of microzonation in organic-rich sediments.

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