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首页> 外文期刊>Applied and Environmental Microbiology >Pelagic-Benthic Coupling of Nucleic Acids in an Abyssal Location of the Northeastern Atlantic Ocean
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Pelagic-Benthic Coupling of Nucleic Acids in an Abyssal Location of the Northeastern Atlantic Ocean

机译：东北大西洋深处的核酸上层-本底耦合

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Spatial and temporal changes in sedimentary nucleic acid concentrations in an abyssal locality of the northeastern Atlantic Ocean were investigated in relation to fluxes of nucleic acids produced in the photic layer. Sediment trap material, collected between 1996 and 1998 at depths of 1,000, 3,000, and 4,700 m, and sediment samples were analyzed for DNA and RNA content. Nucleic acid concentrations in the sediments were very high and displayed significant temporal changes, whereas mesoscale variability was low. DNA and RNA concentrations generally displayed opposite temporal patterns, which are likely to be dependent on the nature and characteristics of DNA and RNA molecules. Nucleic acid fluxes were high and displayed clear seasonal changes apparently coupled with seasonal pulses of primary production. However, while median values of DNA fluxes were relatively similar in all sediment traps, median values of RNA fluxes almost doubled from the 1,000- to the 4,700-m depth, suggesting differences in the metabolic activity of microbes associated with sinking particles. Significant relationships between DNA concentrations in the sediments and DNA fluxes and between RNA concentrations and RNA fluxes, indicating the presence of a clear pelagic-benthic coupling of particulate nucleic acids, were observed. The benthic system investigated was not steady state since we estimated that, from September 1996 to October 1998, nucleic acid concentration in the sediments decreased by about 165 mg of DNA m?2. Vertical profiles revealed a significant decrease in DNA concentration with depth in the sediments, reaching an asymptotic value of about 5 μg g?1. This DNA fraction constitutes a pool of potentially refractory DNA (accounting for 16 to 40% of the total DNA pool) that might be buried in the sediments.
机译：考察了东北大西洋深渊地区沉积核酸浓度的时空变化与光层中产生的核酸通量的关系。分析了1996年至1998年在1,000、3,000和4,700 m深度收集的沉积物陷阱材料和沉积物样本的DNA和RNA含量。沉积物中的核酸浓度很高，并且显示出明显的时间变化，而中尺度变异性很低。 DNA和RNA浓度通常显示相反的时间模式，这可能取决于DNA和RNA分子的性质和特征。核酸通量很高，显示出明显的季节性变化，显然与初级生产的季节性脉动有关。然而，尽管在所有沉积物捕集阱中DNA通量的中值相对相似，但RNA通量的中值从1,000米到4,700米的深度几乎翻了一番，这表明与沉没颗粒相关的微生物的代谢活性存在差异。观察到沉积物中的DNA浓度与DNA通量之间以及RNA浓度与RNA通量之间存在显着的关系，这表明存在颗粒核酸的明显的上层-底层耦合。由于我们估计从1996年9月至1998年10月，沉积物中的核酸浓度降低了约165 mg DNA m？2，因此调查的底栖系统不是稳定状态。垂直剖面表明，随着沉积物深度的增加，DNA浓度显着下降，达到约5μgg？1的渐近值。该DNA组分构成了潜在的难治性DNA池（占总DNA池的16％至40％），可能被掩埋在沉积物中。

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