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首页> 外文期刊>Marine Environmental Research >Impacts of diverted freshwater on dissolved organic matter and microbial communities in Barataria Bay, Louisiana, U.S.A.
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Impacts of diverted freshwater on dissolved organic matter and microbial communities in Barataria Bay, Louisiana, U.S.A.

机译:分流的淡水对美国路易斯安那州巴拉塔里亚湾的溶解有机物和微生物群落的影响。

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摘要

Here we present results of an initial assessment of the impacts of a water diversion event on the concentrations and chemical composition of dissolved organic matter (DOM) and bacterioplankton community composition in Barataria Bay, Louisiana U.S.A, an important estuary within the Mississippi River Delta complex. Concentrations and spectral properties of DOM, as reflected by UV/visible absor-bance and fluorescence, were strikingly similar at 26 sites sampled along transects near two western and two eastern areas of Barataria Bay in July and September 2010. In September 2010, dissolved organic carbon (DOC) was significantly higher (568.1-1043 μMC,x= 755.6 +/- 117.7 μM C, n = 14) than in July 2010 (249.1 -577.1 μMC,x= 383.7 +/- 98.31 μM C, n = 14); conversely, Abs_(254) was consistently higher at every site in July (0.105-0.314) than in September (0.080-0.221), averaging 0.24 ± 0.06 in July and 0.15 ± 0.04 in September. Fluorescence data via the fluorescence index (FI450/500) revealed that only 30% (8 of 26) of the July samples had an FI450/500 above 1.36, compared to 96% (25 of 26) for the September samples. This indicates a more terrestrial origin for the July DOM. Bacterioplankton from eastern sites differed in composition from bacterioplankon in western sites in July. These differences appeared to result from reduced salinities caused by the freshwater diversion. Bacterioplankton communities in September differed from those in July, but no spatial structure was observed. Thus, the trends in bacterioplankton and DOM were likely due to changes in water masses (e.g., input of Mississippi River water in July and a return to estuarine waters in September). Discharge of water from the Davis Pond Freshwater Diversion (DPFD) through Barataria Bay may have partially mitigated some adverse effects of the oil spill, inasmuch as DOM is concerned.
机译:在这里,我们介绍了对密西西比河三角洲综合体的重要河口美国巴拉特里亚湾的引水事件对溶解有机物(DOM)的浓度和化学成分以及浮游细菌群落组成的影响的初步评估结果。 UV /可见光吸收和荧光所反映的DOM的浓度和光谱特性在2010年7月和2010年9月和9月的Barataria湾两个西部和两个东部地区附近的样线采样点上有26个地点非常相似。2010年9月,溶解有机物碳(DOC)明显高于2010年7月(249.1 -577.1μMC,x = 383.7 +/- 98.31μMC,n = 14)(568.1-1043μMC,x = 755.6 +/- 117.7μMC,n = 14) );相反,7月(0.105-0.314)的每个站点的Abs_(254)始终高于9月(0.080-0.221)的平均值,7月的平均值为0.24±0.06,9月的平均值为0.15±0.04。通过荧光指数(FI450 / 500)得出的荧光数据显示,七月样本中只有30%(26个中的8个)的FI450 / 500高于1.36,而九月样本中的96%(26个中的25个)。这表明七月份DOM的地面起源更为广泛。东部地区的浮游细菌的组成与西部地区的浮游细菌的组成有所不同。这些差异似乎是由于淡水转移引起的盐度降低所致。 9月的浮游细菌群落与7月不同,但未观察到空间结构。因此,浮游细菌和DOM的趋势可能是由于水量的变化(例如7月密西西比河河水的输入和9月河口水的返回)。就DOM而言,从戴维斯池塘淡水改道(DPFD)通过巴拉塔里亚湾排放的水可能部分缓解了溢油的一些不利影响。

著录项

  • 来源
    《Marine Environmental Research》 |2011年第5期|p.248-257|共10页
  • 作者单位

    Department of Oceanography, Texas A(&)M University, College Station, TX 77843-3146, USA;

    Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803-7503, USA;

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, CA 30332-0340, USA;

    Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803-7503, USA;

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, CA 30332-0340, USA;

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, CA 30332-0340, USA;

    Department of Oceanography, Texas A(&)M University, College Station, TX 77843-3146, USA;

    Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803-7503, USA;

    Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803-7503, USA;

    Department of Biological Sciences Baton Rouge, LA 70803-7503, USA;

    Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803-7503, USA;

    Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803-7503, USA;

    Department of Chemistry, Louisiana State University, Baton Rouge, LA 70803-7503, USA;

    Department of Oceanography, Texas A(&)M University, College Station, TX 77843-3146, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);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
  • 中图分类
  • 关键词

    freshwater diversion; dissolved organic carbon; bacterioplankton; absorbance; fluorescence; gulf of mexico; deepwater horizon;

    机译:淡水分流;溶解有机碳浮游细菌吸光度荧光墨西哥湾;深水地平线;

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