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首页> 外文期刊>Biocontrol Science >Effect of Magnesium Peroxide Biostimulation of Fish Feed-Loaded Marine Sediments on Changes in the Bacterial Community
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Effect of Magnesium Peroxide Biostimulation of Fish Feed-Loaded Marine Sediments on Changes in the Bacterial Community

机译：鱼饲料中海洋沉积物过氧化镁生物刺激对细菌群落变化的影响

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摘要

The effect of an oxygen-releasing compound (ORC) magnesium peroxide (MgO2) 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% MgO2. 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% MgO2, 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.
机译：在微观实验中测试了放氧化合物（ORC）过氧化镁（MgO2）对水产养殖场有机污染沉积物中细菌群落变化的影响。加入鱼饲料的沉淀物用1％或5％的MgO2处理。鱼饲料的添加导致了高度还原的环境，氧化还原电位低，总硫化物高，并且硫酸盐还原细菌（SRB）丰富。尽管在1％MgO2下沉积物仍然高度还原，但是总硫化物显着减少，氧化还原电位增加，SRB减少。根据变性梯度凝胶电泳（DGGE）对16S核糖体RNA基因（16S rDNA）的分析，细菌群落随处理方式的变化而明显改变。在添加鱼类饲料的沉积物中消失了需氧菌，并且代替了这些需氧菌出现了一些SRB。另一方面，由于ORC的高氧条件，SRB在ORC修正的沉积物中消失了。这项研究表明，沉积物中细菌群落主要受氧化还原电势和SRB产生的硫化物的影响，但总有机碳和氮不是微生物种群的决定因素。

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