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首页> 外文期刊>Environmental Science & Technology >The Consequences of Nonrandomness in Species-Sensitivity in Relation to Functional Traits for Ecosystem-Level Effects of Chemicals
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The Consequences of Nonrandomness in Species-Sensitivity in Relation to Functional Traits for Ecosystem-Level Effects of Chemicals

机译：物种敏感性的非随机性与功能性状相关的后果对化学品在生态系统层面的影响

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摘要

Estimating ecosystem-level effects from single-species bioassays is a major challenge in environmental risk assessment Most extrapolation procedures are based on the implicit assumption that species sensitivities are random with regard to their functional traits. Here, we explore how nonrandomness in species sensitivities affects how species-level and ecosystem level effects of chemical exposure correspond. The effect of a correlation between the trait value under control conditions and the sensitivity of the trait to chemical stress is studied for two traits (per capita growth rate and monoculture yield) under constant and temporary exposure. Theoretical model predictions are thereby validated against a 3-week microcosm experiment, in which eight marine diatoms systems with different correlations between trait values and sensitivities were temporary (1 week) or constantly (3 weeks) exposed to two concentrations of the herbicide atrazine (100 and 250 μg L~(-1)). Negative correlations increased the reduction in ecosystem functioning (productivity) by atrazine for both traits. However, correlations in the per capita growth rate affected productivity only shortly following changes in environmental conditions, whereas correlations in the monoculture yield affected productivity throughout exposure. Correlations between species sensitivities and functional trait values can thus help to identify when ecosystem-level effects are likely to exceed species-level effects.
机译：在环境风险评估中，从单一物种生物测定法估算生态系统水平的影响是一项重大挑战。大多数外推程序基于隐含假设，即物种敏感性对其功能性状是随机的。在这里，我们探索物种敏感性中的非随机性如何影响化学暴露对物种水平和生态系统水平的影响。研究了在恒定和暂时暴露条件下两个性状（人均生长率和单株产量）在控制条件下性状值与化学胁迫敏感性之间相关性的影响。理论模型的预测由此针对一个为期3周的微观实验进行了验证，在该实验中，八个（在特质值和敏感性之间具有不同相关性的）海洋硅藻系统暂时（1周）或持续（3周）暴露于两种浓度的除草剂at去津（100）和250μgL〜（-1））。负相关增加了阿特拉津对这两个性状的生态系统功能（生产力）的降低。但是，人均增长率的相关性仅在环境条件发生变化后不久才影响生产率，而单一养殖产量的相关性则在整个暴露期间影响生产率。因此，物种敏感性和功能性状值之间的相关性可以帮助确定何时生态系统水平的影响可能超过物种水平的影响。

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  • 来源
    《Environmental Science & Technology》 |2017年第12期|7228-7235|共8页
  • 作者

    Jan M. Baert; Frederik De Laender; and Colin R. Janssen;

  • 作者单位

    Laboratory of Environmental Toxicology and Applied Ecology, Ghent University, Coupure Links 653, 9000 Gent, Belgium,Research Unit of Environmental and Evolutionary Biology, University of Namur, Rue de Bruxelles 61, 5000 Namur, Belgium;

    Research Unit of Environmental and Evolutionary Biology, University of Namur, Rue de Bruxelles 61, 5000 Namur, Belgium;

    Laboratory of Environmental Toxicology and Applied Ecology, Ghent University, Coupure Links 653, 9000 Gent, Belgium;

  • 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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