Abstract:
:The effect of an oxygen-releasing compound (ORC) magnesium peroxide (MgO(2)) on the changes in the bacterial community in organically polluted sediment of aquaculture farms was tested in a microcosm experiment. The sediment, to which fish feed was added, was treated with 1% or 5% MgO(2). The addition of fish feed induced a highly reduced environment with low redox potential, high total sulfides, and abundance of sulfate-reducing bacteria (SRB) . Although the sediment remained highly reduced at 1% MgO(2), there was a significant reduction of total sulfides, increase of redox potential, and resultant reduction of SRB. The bacterial community clearly changed with the treatments according to denaturing gradient gel electrophoresis (DGGE) analysis of 16S ribosomal RNA gene (16S rDNA) . Aerobes disappeared in the fish feed-added sediment, and some SRB emerged in place of these aerobes. On the other hand, the SRB disappeared in the ORC-amended sediment due to its highly oxic condition. This study revealed the bacterial community in the sediments was affected mainly by the redox potential and resultant sulfides produced by SRB, but total organic carbon and nitrogen were not determinants of the microbial population.
journal_name
Biocontrol Scijournal_title
Biocontrol scienceauthors
Santander-De Leon SM,Okunishi S,Kihira M,Nakano M,Nuñal SN,Hidaka M,Yoshikawa T,Maeda Hdoi
10.4265/bio.18.41subject
Has Abstractpub_date
2013-01-01 00:00:00pages
41-51issue
1eissn
1342-4815issn
1884-0205pii
DN/JST.JSTAGE/bio/18.41journal_volume
18pub_type
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