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首页> 美国卫生研究院文献>Applied and Environmental Microbiology >Pelagic-Benthic Coupling and Diagenesis of Nucleic Acids in a Deep-Sea Continental Margin and an Open-Slope System of the Eastern Mediterranean
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Pelagic-Benthic Coupling and Diagenesis of Nucleic Acids in a Deep-Sea Continental Margin and an Open-Slope System of the Eastern Mediterranean

机译：深海大陆边缘和东地中海的开坡系统中的上冲-本底耦合和成岩作用

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摘要

Downward fluxes of nucleic acids adsorbed onto settling particles play a key role in the supply of organic phosphorus and genetic material to the ocean interior. However, information on pelagic-benthic coupling, diagenesis, and processes controlling nucleic acid preservation in deep-sea sediments is practically nonexistent. In this study, we compared nucleic acid fluxes, sedimentary DNA and RNA concentrations, and the enzymatically hydrolyzable fraction of DNA in a bathyal continental margin (North Aegean Sea) and an open-sea system (South Aegean Sea) of the Eastern Mediterranean. The two systems displayed contrasting patterns of nucleic acid fluxes, which increased significantly with depth in the North Aegean Sea and decreased with depth in the South Aegean Sea. These results suggest that in continental margin and open-ocean systems different processes control the nucleic acid supply to the sea floor. Differences in nucleic acid fluxes were reflected by nucleic acid concentrations in the sediments, which reached extremely high values in the North Aegean Sea. In this system, a large fraction of DNA may be buried, as suggested by the large fraction of DNA resistant to nuclease degradation and by estimates of burial efficiency (ca. eight times higher in the North than in the South Aegean Sea). Overall, the results reported here suggest that the preservation of DNA in deeper sediment layers may be favored in benthic systems characterized by high sedimentation rates.
机译：吸附在沉降颗粒上的核酸的向下通量在向海洋内部供应有机磷和遗传物质方面起着关键作用。然而，关于深海底栖动物耦合，成岩作用和控制深海沉积物中核酸保存的过程的信息实际上是不存在的。在这项研究中，我们比较了地中海东部海床边缘（北爱琴海）和公海系统（南爱琴海）的核酸通量，沉积的DNA和RNA浓度以及DNA的可酶水解部分。这两个系统显示出相反的核酸通量模式，在北爱琴海中随着深度增加而显着增加，而在南爱琴海中随着深度减少而减小。这些结果表明，在大陆边缘和开放海洋系统中，不同的过程控制着向海底的核酸供应。沉积物中的核酸浓度反映了核酸通量的差异，在北爱琴海达到了极高的值。在这个系统中，很大一部分的DNA可能被掩埋，这是因为很大一部分的抗核酸酶降解的DNA和埋葬效率的估计所表明的（北约比南爱琴海高8倍）。总体而言，此处报道的结果表明，在以高沉积速率为特征的底栖系统中，DNA在较深沉积层中的保存可能会受到青睐。

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