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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Subseafloor sedimentary life in the South Pacific Gyre
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Subseafloor sedimentary life in the South Pacific Gyre

机译：南太平洋环流的海底沉积物生命

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摘要

The low-productivity South Pacific Gyre (SPG) is Earth's largest oceanic province. Its sediment accumulates extraordinarily slowly (0.1-1 m per million years). This sediment contains a living community that is characterized by very low biomass and very low metabolic activity. At every depth in cored SPG sediment, mean cell abundances are 3 to 4 orders of magnitude lower than at the same depths in all previously explored subseafloor communities. The net rate of respiration by the subseafloor sedimentary community at each SPG site is 1 to 3 orders of magnitude lower than the rates at previously explored sites. Because of the low respiration rates and the thinness of the sediment, interstitial waters are oxic throughout the sediment column in most of this region. Consequently, the sedimentary community of the SPG is predominantly aerobic, unlike previously explored subseafloor communities. Generation of H_2 by radiolysis of water is a significant electron-donor source for this community. The per-cell respiration rates of this community are about 2 orders of magnitude higher (in oxidation/reduction equivalents) than in previously explored anaerobic subseafloor communities. Respiration rates and cell concentrations in subseafloor sediment throughout almost half of the world ocean may approach those in SPG sediment.
机译：生产力低下的南太平洋环流（SPG）是地球上最大的海洋省。其沉积物非常缓慢地积聚（每百万年0.1-1 m）。该沉积物包含一个生物群落，其特征是生物量非常低，代谢活性非常低。在有芯SPG沉积物的每个深度处，平均细胞丰度比以前探索过的所有海底群落中的相同深度低3至4个数量级。每个SPG站点海底沉积群落的净呼吸速率比以前勘探的站点低1-3个数量级。由于呼吸速率低和沉积物稀薄，在该区域大部分地区，整个沉积物柱间的间隙水都是有氧的。因此，与以前探索的海底群落不同，SPG的沉积群落主要是好氧的。通过水的辐射分解产生H_2是该群落的重要电子供体来源。该群落的每细胞呼吸速率（以氧化/还原当量计）比以前探索的厌氧海底群落高约2个数量级。在世界近一半的海底海底沉积物中，呼吸速率和细胞浓度可能接近SPG沉积物中的呼吸速率和细胞浓度。

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    Steven DHondt; Arthur J. Spivack; Robert Pockalny; Timothy G. Ferdelman; Jan P. Fischer; Jens Kallmeyer; Lewis J. Abrams; David C. Smith; Dennis Graham; Franciszek Hasiuk; Heather Schrum; Andrea M. Stancin;

  • 作者单位

    Graduate School of Oceanography, University of Rhode Island, Narragansett Bay Campus, South Ferry Road, Narragansett, RI 02882;

    Graduate School of Oceanography, University of Rhode Island, Narragansett Bay Campus, South Ferry Road, Narragansett, RI 02882;

    Graduate School of Oceanography, University of Rhode Island, Narragansett Bay Campus, South Ferry Road, Narragansett, RI 02882;

    Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, D-28359 Bremen, Germany;

    Max Planck Institute for Marine Microbiology, Celsiusstrasse 1, D-28359 Bremen, Germany;

    Department of Geosciences, University of Potsdam, Haus 27, Zi. 0.34, Karl-Liebknecht-Strasse 24, 14476 Golm, Germany;

    Department of Geography and Geology, University of North Carolina at Wilmington, DeLoach Hall, 601 South College Road, Wilmington, NC 28403;

    Graduate School of Oceanography, University of Rhode Island, Narragansett Bay Campus, South Ferry Road, Narragansett, RI 02882;

    Graduate School of Oceanography, University of Rhode Island, Narragansett Bay Campus, South Ferry Road, Narragansett, RI 02882;

    Department of Geological Sciences, University of Michigan, 2534 C.C. Little Building, 1100 North University Avenue, Ann Arbor, MI 48109;

    Graduate School of Oceanography, University of Rhode Island, Narragansett Bay Campus, South Ferry Road, Narragansett, RI 02882;

    Department of Geological Sciences, University of Michigan, 2534 C.C. Little Building, 1100 North University Avenue, Ann Arbor, MI 48109;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    aerobic; biomass; oxic; radiolysis; respiration;

    机译：有氧生物质有氧放射分解呼吸;

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