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首页> 外文期刊>Oceanography >Abundance and Production Rates of Heterotrophic Bacterioplankton in the Context of Sediment and Water Column Processes in the Chukchi Sea
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Abundance and Production Rates of Heterotrophic Bacterioplankton in the Context of Sediment and Water Column Processes in the Chukchi Sea

机译：楚科奇海沉积物和水柱过程中异养浮游细菌的丰度和生产率

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摘要

Bacterial production and abundance are linked to areas of high biological production in the water column and in the underlying benthos in the Chukchi Sea. Process measurements taken during the Russian American Long-term Census of the Arctic (RUSALCA) program, such as the carbon isotope composition of sinking particulate organic matter and sediment organic matter, are used to put bacterial production and abundance in context. These measurements show that there are vertical gradients in the water column and that the stable carbon isotope composition of organic materials in the sediments is significantly different from sedimenting materials in the overlying water column. Differences within the water column likely reflect late summer declines in productivity that increase discrimination against C-13 and also provide indications of carbon metabolism in the water column and underlying sediments. Temporal changes in the stable carbon isotope composition of organic matter in surface sediments, as well as C/N ratios in organic matter during the RUSALCA program, are also being observed, specifically higher ratios of C-13/C-12 at some stations near the Chukotka coast, and lower ratios of C-13/C-12 near Point Hope, Alaska. C/N ratios have increased since 2004 at productive sites in the south central Chukchi Sea, suggesting changes in organic material deposition. Other parameters studied on some or all of the decadal series of joint Russia-US cruises include sediment oxygen demand, the nitrogen isotopic composition of organic matter, sediment grain size, chlorophyll content in surface sediments, and elemental ratios of carbon and nitrogen in surface sediments. These process measurements support interpretations that the ecosystem shows strong coupling between bacterial and primary production and the underlying benthos.
机译：细菌的产生和丰度与楚科奇海的水柱和下层的底栖生物的高生物产生面积有关。在俄裔美国人长期北极普查（RUSALCA）计划期间进行的过程测量，例如下沉的颗粒有机物和沉积物有机物的碳同位素组成，被用于研究细菌的产生和丰度。这些测量结果表明，水柱中存在垂直梯度，沉积物中有机物的稳定碳同位素组成与上覆水柱中的沉积物明显不同。水柱内的差异可能反映了夏末生产力的下降，这加剧了人们对C-13的歧视，也提供了水柱和下层沉积物中碳代谢的迹象。在RUSALCA计划期间，还观察到了表面沉积物中有机物的稳定碳同位素组成的时间变化，以及在RUSALCA计划中有机物的C / N比，特别是在附近一些站点C-13 / C-12的比值更高楚科奇（Chukotka）海岸，以及阿拉斯加Point Hope附近C-13 / C-12的比率较低。自2004年以来，楚科奇海中南部生产基地的C / N比有所增加，表明有机物质沉积发生了变化。在俄美联合航行的某些或全部十年序列中研究的其他参数包括沉积物需氧量，有机物的氮同位素组成，沉积物粒度，表面沉积物中的叶绿素含量以及表面沉积物中碳氮元素比。这些过程测量结果支持以下解释，即生态系统显示出细菌和初级生产与底层生物之间的强耦合。

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  • 来源
    《Oceanography》 |2015年第3期|84-99|共16页
  • 作者

    Cooper Lee W.; Savvichev Alexander S.; Grebmeier Jacqueline M.;

  • 作者单位

    Univ Maryland, Chesapeake Biol Lab, Ctr Environm Sci, Solomons, MD 20688 USA;

    Russian Acad Sci, Winogradsky Inst Microbiol, Moscow, Russia;

    Univ Maryland, Chesapeake Biol Lab, Ctr Environm Sci, Solomons, MD 20688 USA;

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