N Transformation-C Turnover Processes and Microbial Community Structure Responding to Hydrodynamic Mixing of Groundwater and Surface Water in Hyporheic Zone Sediment Columns

2021 ◽  
Author(s):  
Longfei Wang ◽  
Yutao Wang ◽  
Yi Li ◽  
Jinxin Zhu ◽  
Wenlong Zhang ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Surface Water ◽  
Microbial Community Structure ◽  
Hyporheic Zone ◽  
N Transformation

scholarly journals Seasonal Dynamics of Shallow-Hyporheic-Zone Microbial Community Structure along a Heavy-Metal Contamination Gradient

2004 ◽  
Vol 70 (4) ◽  
pp. 2323-2331 ◽  
Author(s):  
Kevin P. Feris ◽  
Philip W. Ramsey ◽  
Chris Frazar ◽  
Matthias Rillig ◽  
Johnnie N. Moore ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Heavy Metal ◽  
Community Structure ◽  
Microbial Community ◽  
Microbial Communities ◽  
Microbial Community Structure ◽  
Metal Contamination ◽  
Hyporheic Zone ◽  
Heavy Metal Contamination ◽  
The Difference

ABSTRACT Heavy metals contaminate numerous freshwater streams and rivers worldwide. Previous work by this group demonstrated a relationship between the structure of hyporheic microbial communities and the fluvial deposition of heavy metals along a contamination gradient during the fall season. Seasonal variation has been documented in microbial communities in numerous terrestrial and aquatic environments, including the hyporheic zone. The current study was designed to assess whether relationships between hyporheic microbial community structure and heavy-metal contamination vary seasonally by monitoring community structure along a heavy-metal contamination gradient for more than a year. No relationship between total bacterial abundance and heavy metals was observed (R 2 = 0.02, P = 0.83). However, denaturing gradient gel electrophoresis pattern analysis indicated a strong and consistent linear relationship between the difference in microbial community composition (populations present) and the difference in the heavy metal content of hyporheic sediments throughout the year (R 2 = 0.58, P < 0.001). Correlations between heavy-metal contamination and the abundance of four specific phylogenetic groups (most closely related to the α, β, and γ-proteobacteria and cyanobacteria) were apparent only during the fall and early winter, when the majority of organic matter is deposited into regional streams. These seasonal data suggest that the abundance of susceptible populations responds to heavy metals primarily during seasons when the potential for growth is highest.

scholarly journals Differences in Hyporheic-Zone Microbial Community Structure along a Heavy-Metal Contamination Gradient

2003 ◽  
Vol 69 (9) ◽  
pp. 5563-5573 ◽  
Author(s):  
Kevin Feris ◽  
Philip Ramsey ◽  
Chris Frazar ◽  
Johnnie N. Moore ◽  
James E. Gannon ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Community Structure ◽  
Microbial Community ◽  
Microbial Communities ◽  
Microbial Community Structure ◽  
Metal Contamination ◽  
Metal Content ◽  
Hyporheic Zone ◽  
Heavy Metal Contamination ◽  
Sediment Metal

ABSTRACT The hyporheic zone of a river is nonphotic, has steep chemical and redox gradients, and has a heterotrophic food web based on the consumption of organic carbon entrained from downwelling surface water or from upwelling groundwater. The microbial communities in the hyporheic zone are an important component of these heterotrophic food webs and perform essential functions in lotic ecosystems. Using a suite of methods (denaturing gradient gel electrophoresis, 16S rRNA phylogeny, phospholipid fatty acid analysis, direct microscopic enumeration, and quantitative PCR), we compared the microbial communities inhabiting the hyporheic zone of six different river sites that encompass a wide range of sediment metal loads resulting from large base-metal mining activity in the region. There was no correlation between sediment metal content and the total hyporheic microbial biomass present within each site. However, microbial community structure showed a significant linear relationship with the sediment metal loads. The abundances of four phylogenetic groups (groups I, II, III, and IV) most closely related to α-, β-, and γ-proteobacteria and the cyanobacteria, respectively, were determined. The sediment metal content gradient was positively correlated with group III abundance and negatively correlated with group II abundance. No correlation was apparent with regard to group I or IV abundance. This is the first documentation of a relationship between fluvially deposited heavy-metal contamination and hyporheic microbial community structure. The information presented here may be useful in predicting long-term effects of heavy-metal contamination in streams and provides a basis for further studies of metal effects on hyporheic microbial communities.

Effects of Sewage Treatment on Microbial Community Structure of Surface Water in Xiantao Wetland

OALib ◽  
2018 ◽  
Vol 05 (04) ◽  
pp. 1-12
Author(s):  
Shufen Song ◽  
Fan Yang ◽  
Li-An Ma ◽  
Xiu-Fang Gao
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Surface Water ◽  
Microbial Community Structure ◽  
Sewage Treatment

Microbial Community Structure and Metabolic Potential of the Hyporheic Zone of a Large Mid-Stream Channel Bar

2019 ◽  
Vol 36 (9) ◽  
pp. 765-776 ◽  
Author(s):  
Joshua D. Sackett ◽  
Christopher L. Shope ◽  
James C. Bruckner ◽  
Journét Wallace ◽  
Clay A. Cooper ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Hyporheic Zone ◽  
Stream Channel ◽  
Metabolic Potential ◽  
Channel Bar

scholarly journals Do Long-Term Conservation Pasture Management Practices Influence Microbial Diversity and Antimicrobial Resistant Genes in Runoff?

2021 ◽  
Vol 12 ◽  
Author(s):  
Yichao Yang ◽  
Amanda J. Ashworth ◽  
Lisa M. Durso ◽  
Mary Savin ◽  
Jennifer M. DeBruyn ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Surface Water ◽  
Microbial Community Structure ◽  
Management Practices ◽  
Poultry Litter ◽  
Water Runoff ◽  
Pasture Management ◽  
Bacterial Richness

Runoff from land-applied manure and poultry litter is one mechanism by which manure-borne bacteria are transported over large distances in the environment. There is a global concern that antimicrobial resistant (AMR) genes may be transmitted through the food chain from animal manures to soil to surface water. However, details are lacking on the ecology of AMR genes in water runoff as well as how conservation management practices may affect the runoff microbiome or minimize the movement of AMR genes. The aim of this study was to identify microbial community structure and diversity in water runoff following 14-years of poultry litter and cattle manure deposition and to evaluate the amount of AMR genes under five conventional and conservation pasture management strategies. Since 2004, all watersheds received annual poultry litter at a rate of 5.6 Mg ha−1 and were consistently managed. Surface runoff samples were collected from each watershed from 2018 to 2019, characterized using Illumina 16S rRNA gene amplicon sequencing and enumerated for four AMR-associated genes (ermB, sulI, intlI, and blactx-m-32) using quantitative PCR. Overall, long-term pasture management influenced water microbial community structure, with effects differing by year (p &lt; 0.05). Bacterial richness (Chao1 index) was influenced by pasture management, with the lowest richness occurring in the control (nearby non-agricultural water source) and the greatest under fields that were hayed (no cattle presence). Runoff bacterial richness in watersheds increased following poultry litter applications, indicating poultry litter is a possible source of bacteria and altered runoff community structure. The blactx-m-32 gene was not detected in any surface water sample. The remaining three AMR genes were absent in the non-agricultural control, but present in agricultural samples. However, there was no impact (p &gt; 0.05) from pasture management on the abundance of these genes, indicating both conventional and conservation practices have similar ecologies for these targets; however, there was a greater detection of sulI genes from runoff in continuously grazed systems in 2019, with hay being lowest in 2019. Results illustrate that the edge of field buffer strips may increase bacterial richness in water runoff, but these changes in richness do not greatly impact target AMR genes in the United States largest land-use category.

Impact of pollution and seasonal changes on microbial community structure in surface water

2010 ◽  
Vol 61 (11) ◽  
pp. 2787-2795 ◽  
Author(s):  
H. Mlejnková ◽  
K. Sovová
Keyword(s):  
Waste Water ◽  
Water Pollution ◽  
Community Structure ◽  
Microbial Community ◽  
Surface Water ◽  
Microbial Community Structure ◽  
Seasonal Changes ◽  
Polluted Water ◽  
Pollution Level ◽  
Phylogenetic Groups

We studied the differences in a microbial community structure with respect to the water pollution level and seasonal changes. The determination of phylogenetic groups of Bacteria and Archaea was done using fluorescent in situ hybridization (FISH). The total number of microorganisms was determined by direct counting of DAPI (4′,6-diamidino-2-phenylindole) stained samples using a fluorescence microscope. Our results showed that the microbial community structure was significantly dependent on the level of water pollution, both in absolute microbial counts and in relative abundance of phylogenetic groups. For surface water with anthropogenic pollution, the microbial community with significant proportion of Betaproteobacteria and Cytophaga-Flavobacterium was characteristic. Gammaproteobacteria were significant in municipal waste water. In microbial communities with low numbers of microorganisms (e.g. non-polluted water and some industrial waste water) represented the significant component groups Alphaproteobacteria and Archaea. The impact of seasonal changes on the microbial distribution was not significant.

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