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Accumulation and Cycling of Polycyclic Aromatic Hydrocarbons in Zooplankton

机译：浮游动物中多环芳烃的积累和循环

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Planktonic food webs play an important role driving the environmental fate of persistent organic pollutants, and POP accumulation in phytoplankton has been previously studied for its importance as a first step in the aquatic food webs. However, little is known about the accumulation and cycling of organic pollutants between zooplankton and water. The present study shows the results of laboratory experiments on the bioconcentration (by passive uptake) of polycyclic aromatic hydrocarbons in phytoplankton (Rhodomonas salina) and accumulation in copepods (Paracartia(acartia) gram), by ingestion and diffusion. Both bioconcentration (BCF) and bioaccumulation (BAF) factors show significant correlation with the octanol-water partition coefficient (K_(ow) for phytoplankton and zooplankton. The BCF values for phytoplankton were 2 orders of magnitude higher than those for copepods. The analysis of fecal pellets shows that elimination by defecation is mainly significant for PAHs taken up from ingested phytoplankton but not due to passive uptake. However, the dominant elimination mechanisms are by far metabolism and diffusive depuration. Indeed, the mass balance suggests that metabolism of PAHs by copepods is a significant process that could play a role in the fate of PAHs in the water column. Uptake, depuration, eggestion, and ingestion rates increased with hydrophobicity of the chemical, while the metabolism rate was slightly higher for the less hydrophobic compounds. Passive partitioning dominated the accumulation of POPs in zooplankton. The derivation of all the uptake and loss rate constants for PAHs opens the doorto future modeling studies of the role of zooplankton in PAH cycling in the marine environment.
机译：浮游生物食物网在驱动持久性有机污染物的环境命运方面起着重要作用，而浮游植物中的POP积累作为其在水生食物网中迈出的第一步，其重要性已被先前研究过。但是，关于浮游动物和水之间有机污染物的积累和循环的了解甚少。本研究显示了通过摄取和扩散对浮游植物（Rhodomonas salina）中多环芳烃的生物浓缩（通过被动摄取）和co足类动物（Par足动物（ac草）克）中生物富集（通过被动摄入）的实验结果。浮游植物和浮游动物的生物浓度（BCF）和生物富集（BAF）因子均与辛醇-水分配系数（K_（ow））显着相关，浮游植物的BCF值比co足类动物高出2个数量级。粪便颗粒表明，通过排便消除对摄入的浮游植物摄取的多环芳烃具有重要意义，但不是由于被动摄入引起的，但主要的消除机制是新陈代谢和扩散性净化，事实上，质量平衡表明co足动物对多环芳烃的代谢这是一个重要的过程，可能会影响水柱中多环芳烃的命运，其吸收，净化，养卵和摄入速率随该化学品的疏水性而增加，而疏水性较低的化合物的代谢率则稍高。浮游动物中持久性有机污染物的积累占主导地位。 r多环芳烃为未来浮游动物在海洋环境中多环芳烃循环中的作用建模研究打开了大门。

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  • 来源
    《Environmental Science & Technology》 |2009年第7期|2295-2301|共7页
  • 作者

    NAIARA BERROJALBIZ; SILVIA LACORTE; ALBERT CALBET; ENRIC SAIZ; CARLOS BARATA; JORDI DACHS;

  • 作者单位

    Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-26, 08034, Barcelona, Catalunya, Spain;

    Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-26, 08034, Barcelona, Catalunya, Spain;

    Institut de Ciencies del Mar, ICM-CSIC, P. Maritim de la, Barceloneta 37-49, 08003, Barcelona, Catalunya, Spain;

    Institut de Ciencies del Mar, ICM-CSIC, P. Maritim de la, Barceloneta 37-49, 08003, Barcelona, Catalunya, Spain;

    Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-26, 08034, Barcelona, Catalunya, Spain;

    Department of Environmental Chemistry, IDAEA-CSIC, Jordi Girona 18-26, 08034, Barcelona, Catalunya, Spain;

  • 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);
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