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

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 activi...

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Bibliographic Details
Published in:Water science and technology 2005-01, Vol.52 (9), p.107-114
Main Authors: Hasanudin, U, Fujita, M, Koibuchi, Y, Fujie, K
Format: Article
Language:English
Subjects:
Anoxia
Anoxic conditions
Anoxic sediments
Aquatic ecosystems
Bacteria
Bacteria - growth & development
Bottom trawling
Communities
Community structure
Dissolved oxygen
Dredging
Environmental changes
Environmental Monitoring
Facility Design and Construction
Geologic Sediments - chemistry
Geologic Sediments - microbiology
Isoprene
Japan
Marine
Microorganisms
Ocean floor
Oxygen - analysis
Phosphorus
Population Dynamics
Quinones
Seasons
Sediment
Sediments
Shape
Sulfur
Sulfur cycle
Sulphur
Summer
Ubiquinone
Water Microbiology
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Summary: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.
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2005.0298