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首页> 外文期刊>Science of the total environment >Benzo(a)pyrene inhibits the role of the bioturbator Tubifex tubifex in river sediment biogeochemistry
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Benzo(a)pyrene inhibits the role of the bioturbator Tubifex tubifex in river sediment biogeochemistry

机译：苯并（a）s抑制生物扰动剂Tubifex tubifex在河流沉积物生物地球化学中的作用

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摘要

The interactions between invertebrates and micro-organisms living in streambed sediments often play key roles in the regulation of nutrient and organic matter fluxes in aquatic ecosystems. However, benthic sediments also constitute a privileged compartment for the accumulation of persistent organic pollutants such as PAHs or PCBs that may affect the diversity, abundance and activity of benthic organisms. The objective of this study was to quantify the impact of sediment contamination with the PAH benzo(a)pyrene on the interaction between micro-organisms and the tubificid worm, Tubifex tubifex, which has been recognized as a major bioturbator in freshwater sediments. Sedimentary microcosms (slow filtration columns) contaminated or not with benzo(a)pyrene (3 tested concentrations: 0,1 and 5 mg kg~(-1)) at the sediment surface were incubated under laboratory conditions in the presence (100 individuals) or absence of T. tubifex. Although the surface sediment contaminations with 1 mg kg~(-1) and 5 mg kg~(-1) of benzo(a)pyrene did not affect tubificid worm survival, these contaminations significantly influenced the role played by T. tubifex in biogeochemical processes. Indeed, tubificid worms stimulated aerobic respiration, denitrifkation, dehydrogenase and hydrolytic activities of micro-organisms in uncontaminated sediments whereas such effects were inhibited in sediments polluted with benzo(a)pyrene. This inhibition was due to contaminant-induced changes in bioturbation (and especially bio-irrigation) activities of worms and their resulting effects on microbial processes. This study reveals the importance of sublethal concentrations of a contaminant on ecological processes in river sediments through affecting bioturbator-microbe interactions. Since they affect microbial processes involved in water purification processes, such impacts of sublethal concentrations of pollutants should be more often considered in ecosystem health assessment.
机译：无脊椎动物与生活在河床沉积物中的微生物之间的相互作用通常在调节水生生态系统的养分和有机质通量中起关键作用。但是，底栖沉积物也构成了特权区室，用于积累可能影响底栖生物的多样性，丰度和活动的持久性有机污染物，例如PAHs或PCBs。这项研究的目的是量化PAH苯并（a）sediment对沉积物的污染对微生物与管状蠕虫Tubifex tubifex之间相互作用的影响，该蠕虫被公认为淡水沉积物中的主要生物扰动剂。在实验室条件下在有条件的情况下（100个人）孵育沉积物表面受苯并（a）re污染或未受苯并（a）3污染（3种测试浓度：0.1和5 mg kg〜（-1））的沉积微观世界（慢速过滤柱）。或不存在T.tubifex。尽管以1 mg kg〜（-1）和5 mg kg〜（-1）的苯并（a）re造成的表面沉积物污染不会影响微管蠕虫的存活，但这些污染显着影响了T.tubifex在生物地球化学过程中的作用。的确，蠕虫蠕虫刺激了未污染沉积物中微生物的需氧呼吸，反硝化作用，脱氢酶和微生物的水解活性，而在被苯并（a）py污染的沉积物中，这种作用被抑制了。这种抑制作用是由于污染物引起的蠕虫生物扰动（尤其是生物灌溉）活动的变化及其对微生物过程的影响。这项研究揭示了污染物的致死浓度对通过影响生物湍流-微生物相互作用对河流沉积物生态过程的重要性。由于它们影响水净化过程中涉及的微生物过程，因此在生态系统健康评估中应更经常考虑污染物的亚致死浓度的这种影响。

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  • 来源
    《Science of the total environment》 |2013年第15期|230-241|共12页
  • 作者

    F. Mermillod-Blondin; A. Foulquier; F. Gilbert; S. Navel; B. Montuelle; F. Bellvert; G. Comte; V. Grossi; F. Fourel; C. Lecuyer; L Simon;

  • 作者单位

    Universite de Lyon, UMR5023 Ecologie des Hydrosystemes Naturels et Anthropises, Universite Lyon 1, ENTPE, CNRS, 6 rue Raphael Dubois, 69622 Villeurbanne, France;

    Universite de Lyon, UMR5023 Ecologie des Hydrosystemes Naturels et Anthropises, Universite Lyon 1, ENTPE, CNRS, 6 rue Raphael Dubois, 69622 Villeurbanne, France,Irstea, Croupement de Lyon, UR MALY, 5 Rue de la Doua, 69626 Villeurbanne, France;

    Universite de Toulouse, UPS, INP, EcoLab, 118 route de Narbonne, F-31062 Toulouse, France, CNRS, EcoLab, F-31062 Toulouse, France;

    Universite de Lyon, UMR5023 Ecologie des Hydrosystemes Naturels et Anthropises, Universite Lyon 1, ENTPE, CNRS, 6 rue Raphael Dubois, 69622 Villeurbanne, France;

    Irstea, Croupement de Lyon, UR MALY, 5 Rue de la Doua, 69626 Villeurbanne, France;

    Universite de Lyon, UMR5557 Laboratoire d'Ecologie Microbienne, Universite Lyon 1. CNRS, 69622 Villeurbanne, France;

    Universite de Lyon, UMR5557 Laboratoire d'Ecologie Microbienne, Universite Lyon 1. CNRS, 69622 Villeurbanne, France;

    Universite de Lyon, UMR5276 Laboratoire de Ceologie de Lyon, Terre, Planetes, Environnement, Universite Lyon 1, ENS Lyon, CNRS, 69622 Villeurbanne, France;

    Universite de Lyon, UMR5276 Laboratoire de Ceologie de Lyon, Terre, Planetes, Environnement, Universite Lyon 1, ENS Lyon, CNRS, 69622 Villeurbanne, France;

    Universite de Lyon, UMR5276 Laboratoire de Ceologie de Lyon, Terre, Planetes, Environnement, Universite Lyon 1, ENS Lyon, CNRS, 69622 Villeurbanne, France;

    Universite de Lyon, UMR5023 Ecologie des Hydrosystemes Naturels et Anthropises, Universite Lyon 1, ENTPE, CNRS, 6 rue Raphael Dubois, 69622 Villeurbanne, France;

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  • 正文语种 eng
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  • 关键词

    polluted sediments; benzo(a)pyrene; bioturbation; microbial activities; biogeochemical processes; slow infiltration columns;

    机译：污染的沉积物;苯并a生物扰动微生物活动;生物地球化学过程;慢速渗透柱;

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