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首页> 外文期刊>Applied Microbiology >Recruitment of Members from the Rare Biosphere of Marine Bacterioplankton Communities after an Environmental Disturbance
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Recruitment of Members from the Rare Biosphere of Marine Bacterioplankton Communities after an Environmental Disturbance

机译：环境扰动后从海洋细菌浮游生物稀有生物圈招募成员

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A bacterial community may be resistant to environmental disturbances if some of its species show metabolic flexibility and physiological tolerance to the changing conditions. Alternatively, disturbances can change the composition of the community and thereby potentially affect ecosystem processes. The impact of disturbance on the composition of bacterioplankton communities was examined in continuous seawater cultures. Bacterial assemblages from geographically closely connected areas, the Baltic Sea (salinity 7 and high dissolved organic carbon [DOC]) and Skagerrak (salinity 28 and low DOC), were exposed to gradual opposing changes in salinity and DOC over a 3-week period such that the Baltic community was exposed to Skagerrak salinity and DOC and vice versa. Denaturing gradient gel electrophoresis and clone libraries of PCR-amplified 16S rRNA genes showed that the composition of the transplanted communities differed significantly from those held at constant salinity. Despite this, the growth yields (number of cells ml~(?1)) were similar, which suggests similar levels of substrate utilization. Deep 454 pyrosequencing of 16S rRNA genes showed that the composition of the disturbed communities had changed due to the recruitment of phylotypes present in the rare biosphere of the original community. The study shows that members of the rare biosphere can become abundant in a bacterioplankton community after disturbance and that those bacteria can have important roles in maintaining ecosystem processes.
机译：如果细菌群落的某些物种表现出新陈代谢的柔韧性和对不断变化的条件的生理耐受性，则它可以抵抗环境干扰。或者，干扰会改变社区的组成，从而潜在地影响生态系统过程。在连续的海水养殖中检查了干扰对浮游细菌群落组成的影响。来自地理位置紧密相连的地区，波罗的海（盐度7和高溶解有机碳[DOC]）和Skagerrak（盐度28和低DOC）的细菌集合在3周的时间内逐渐受到盐度和DOC的相反变化的影响，例如波罗的海社区暴露于Skagerrak盐度和DOC，反之亦然。变性梯度凝胶电泳和PCR扩增的16S rRNA基因的克隆文库表明，移植群落的组成与保持恒定盐度的显着不同。尽管如此，生长产量（细胞数ml-1（？1））相似，表明底物利用率相似。 16S rRNA基因的深层454焦磷酸测序表明，受干扰社区的组成已发生变化，这是由于原始社区的罕见生物圈中存在的系统型募集而引起的。研究表明，这种稀有生物圈的成员在受到干扰后可以在浮游植物群落中变得丰富，这些细菌在维持生态系统过程中可以发挥重要作用。

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