Dynamic changes in environment condition and microbial community structure in trench and flat seabed sediments of Tokyo Bay, Japan

2005 ◽  
Vol 52 (9) ◽  
pp. 107-114 ◽  
Author(s):  
U. Hasanudin ◽  
M. Fujita ◽  
Y. Koibuchi ◽  
K. Fujie
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Sulfur Cycle ◽  
Chemical Environment ◽  
Tokyo Bay ◽  
Dynamic Changes ◽  
Overlying Water ◽  
Anoxic Conditions ◽  
Seabed Sediments

Dynamic changes in the chemical environment in the bottom of overlying water and microbial community structure in trench and flat seabed sediments were evaluated during summer and autumn in Tokyo Bay, Japan, to elucidate the response of microbial community changes as a consequence of dredging activity. Quinone profile analysis was performed to evaluate the changes in microbial community structure in the sediments. Bottom shape and location of each station affected the chemical environment of the overlying water. The trench bottom shape had longer anoxic conditions than the flat bottom shape. Nitrogen and phosphorus concentrations affected the microbial density in the sediment. During anoxic conditions, the ubiquinone/menaquinone ratio (UQ/MK) was less than unity and increased with rising dissolved oxygen (DO) concentrations. The dominant quinone species in the trench and flat seabed sediments were MK with 6 and 7 isoprene units (MK-6 and MK-7) and UQ with 8 and 9 isoprene units (UQ-8 and UQ-9). MK-6 and UQ-8 containing bacteria might have a great influence on the sulfur cycle of the aquatic ecosystem. While, MK-7 and UQ-9 containing bacteria correlated with the deposition of phototropic bacteria cells onto the seabed sediment. The trench bottom shape contained higher concentrations of MK-6, MK-7, UQ-8 and UQ-9, especially during summer.

scholarly journals Sediment Oxygen Consumption and Microbial Community Structure in Tokyo Bay

2010 ◽  
Vol 66 (1) ◽  
pp. 1036-1040 ◽  
Author(s):  
Masanori ENDO ◽  
Yukio KOIBUCHI ◽  
Masafumi FUJITA ◽  
Jumpei SUZUKI ◽  
Hisako OGURA ◽  
...  
Keyword(s):  
Oxygen Consumption ◽  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Tokyo Bay ◽  
Sediment Oxygen Consumption

scholarly journals Dynamic changes in microbial community structure and function in phenol-degrading microcosms inoculated with cells from a contaminated aquifer

2010 ◽  
Vol 71 (2) ◽  
pp. 247-259 ◽  
Author(s):  
David R. Elliott ◽  
Julie D. Scholes ◽  
Steven F. Thornton ◽  
Athanasios Rizoulis ◽  
Steven A. Banwart ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Structure And Function ◽  
Dynamic Changes ◽  
Contaminated Aquifer ◽  
And Function

scholarly journals Microbial Community Structure in the Sediments and Its Relation to Environmental Factors in Eutrophicated Sancha Lake

2019 ◽  
Vol 16 (11) ◽  
pp. 1931 ◽  
Author(s):  
Yong Li ◽  
Jiejie Zhang ◽  
Jianqiang Zhang ◽  
Wenlai Xu ◽  
Zishen Mou
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Total Phosphorus ◽  
Microbial Community Structure ◽  
High Throughput Sequencing ◽  
Pearson Correlation ◽  
Microbial Populations ◽  
Rrna Gene ◽  
Overlying Water ◽  
Four Seasons

To study the microbial community structure in sediments and its relation to eutrophication environment factors, the sediments and the overlying water of Sancha Lake were collected in the four seasons. MiSeq high-throughput sequencing was conducted for the V3–V4 hypervariable regions of the 16S rRNA gene and was used to analyze the microbial community structure in sediments. Pearson correlation and redundancy analysis (RDA) were conducted to determine the relation between microbial populations and eutrophic factors. The results demonstrated four main patterns: (1) in the 36 samples that were collected, the classification annotation suggested 64 phyla, 259 classes, 476 orders, 759 families, and 9325 OTUs; (2) The diversity indices were ordered according to their values as with summer > winter > autumn > spring; (3) The microbial populations in the four seasons belonged to two distinct characteristic groups; (4) pH, dissolved oxygen (DO), total phosphorus (TP), and total nitrogen (TN) had significant effects on the community composition and structure, which further affected the dissolved total phosphorus (DTP) significantly. The present study demonstrates that the microbial communities in Sancha Lake sediments are highly diverse, their compositions and distributions are significantly different between spring and non-spring, and Actinobacteria and Cyanobacteria may be the key populations or indicator organisms for eutrophication.

Changes in sediment microbial community structure within a large water-storage reservoir during an extreme drawdown event

2008 ◽  
Vol 59 (10) ◽  
pp. 890 ◽  
Author(s):  
A. N. Boulding ◽  
G. N. Rees ◽  
D. S. Baldwin ◽  
P. J. Suter ◽  
G. O. Watson
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Communities ◽  
Microbial Community Structure ◽  
Overlying Water ◽  
Littoral Sediments ◽  
Dry Conditions ◽  
History Of ◽  
Large Water ◽  
Different Levels

Although drought and drying of waters occur globally, the effect of drying on sediment microbial communities underpinning aquatic biogeochemical processes is poorly understood. We used the molecular method of terminal-restriction fragment length polymorphism (T-RFLP) to assess changes in the microbial community structure of sediments undergoing different levels of inundation and drying within a reservoir during drawdown in a drought. Sediments with three hydrological conditions were investigated: dry sediments (no overlying water), littoral sediments (covered with 1–2 mm water) and inundated sediments (covered with >1 m water). Sampling was done in winter 2006 (August) and summer 2007 (January) in Lake Hume, Australia. The microbial communities differed significantly between the different levels of inundation at each sampling time. Community structure also changed significantly within each site between winter 2006 and summer 2007, possibly influenced by the change of season or protracted drying. Sites that were ‘littoral’ in winter 2006 became ‘dry’ in summer 2007, and became more similar to communities that were ‘dry’ at both sampling times. This suggested that the hydrological history of specific sites did not heavily influence the response of microbial communities to severe drying, and all communities undergoing ‘dry’ conditions within the summer 2007 sampling responded similarly.

The First Use of Biofilm Microbial Community Structure as an Indicator of Impact of Two Dams on the Elwha River (Washington)

2009 ◽  
Vol 27 (4) ◽  
pp. 385-387
Author(s):  
W. D. Eaton ◽  
B. Wilmot ◽  
E. Epler ◽  
S. Mangiamelli ◽  
D. Barry
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Elwha River
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