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首页> 外文期刊>Environmental Science & Technology >Combined Effects from γ Radiation and Fluoranthene Exposure on Carbon Transfer from Phytoplankton to Zooplankton
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Combined Effects from γ Radiation and Fluoranthene Exposure on Carbon Transfer from Phytoplankton to Zooplankton

机译：γ辐射和荧蒽暴露对碳从浮游植物向浮游动物迁移的综合影响

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摘要

Risk assessment does not usually take into account mixtures of contaminants, thus potentially under- or overestimating environmental effects. We investigated how the transfer of carbon between a primary producer, Pseudokirchneriella subcapitata, and a consumer, Daphnia magna, is affected by acute exposure of γ radiation (GR) in combination with the polycyclic aromatic hydrocarbon fluoranthene (FA). We exposed D. magna to five concentrations of FA and five acute doses of GR as single contaminants and in nine binary combinations. We compared the observed data for three end points (incorporation of carbon by D. magna, D. magna ingestion rates, and growth) to the predicted joint effects of the mixed stressors based on the independent action (IA) concept. There were deviations from the IA predictions, especially for ingestion rates and carbon incorporation by D. magna, where antagonistic effects were observed at the lower doses, while synergism was seen at the highest doses. Our results highlight the importance of investigating the effects of exposure to GR in a multistressor context. In mixtures of GR and FA, the IA-predicted effects seem to be conservative as antagonism between the two stressors was the dominant pattern, possibly due to stimulation of cellular antioxidative stress mechanisms.
机译：风险评估通常不考虑污染物的混合物，因此潜在地低估或高估了环境影响。我们调查了γ辐射（GR）与多环芳烃荧蒽（FA）的急性暴露如何影响主要生产者亚伪装假单胞菌和消费者水蚤（Daphnia magna）之间的碳转移。我们将D. magna暴露于五种浓度的FA和五种急性剂量的GR作为单一污染物，并以九种二元组合的形式暴露。我们将观察到的三个终点（D. magna掺入碳，D。magna摄入速率和生长）的数据与基于独立作用（IA）概念的混合应激源的预测联合作用进行了比较。与IA的预测存在偏差，特别是在大果蝇的摄入速率和碳吸收方面，在较低剂量下观察到拮抗作用，而在最高剂量下观察到协同作用。我们的结果强调了在多应激环境下调查遗传资源暴露影响的重要性。在GR和FA的混合物中，IA预测的作用似乎是保守的，因为两个应激源之间的拮抗作用是主要模式，可能是由于细胞抗氧化应激机制的刺激。

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  • 来源
    《Environmental Science & Technology》 |2015年第17期|10624-10631|共8页
  • 作者

    Francisco J.A. Nascimento; Claus Svendsen; Clare Bradshaw;

  • 作者单位

    Department of Ecology, Environment and Plant Sciences, Stockholm University, 106 91 Stockholm, Sweden;

    Centre for Ecology and Hydrology, Maclean Building, Benson Lane, Crowmarsh Gifford, Wallingford, OX10 8BB Oxfordshire, United Kingdom;

    Department of Ecology, Environment and Plant Sciences, Stockholm University, 106 91 Stockholm, Sweden;

  • 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
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