Benzo(a)pyrene inhibits the role of the bioturbator Tubifex tubifex in river sediment biogeochemistry

Le benzo(a)pyrene inhibe le rôle du bioturbateur Tubifex tubifex dans le fonctionnement biogéochimique des sédiments de rivière

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

Type de document
Article de revue scientifique à comité de lecture
Langue
Anglais
Affiliation de l'auteur
UNIVERSITE DE LYON UMR5023 ECOLOGIE DES HYDROSYSTEMES NATURELS ET ANTHROPISES UNIVERSITE LYON 1 ENTPE CNRS VILLEURBANNE FRA ; IRSTEA LYON UR MALY FRA ; UNIVERSITE DE TOULOUSE UPS INP ECOLAB TOULOUSE FRA ; UNIVERSITE DE LYON UMR5023 ECOLOGIE DES HYDROSYSTEMES NATURELS ET ANTHROPISES UNIVERSITE LYON 1 ENTPE CNRS VILLEURBANNE FRA ; IRSTEA GROUPEMENT DE LYON UR MALY VILLEURBANNE FRA ; UNIVERSITE DE LYON UMR5557 LABORATOIRE D'ECOLOGIE MICROBIENNE UNIVERSITE LYON 1 CNRS VILLEURBANNE FRA ; UNIVERSITE DE LYON UMR5557 LABORATOIRE D'ECOLOGIE MICROBIENNE UNIVERSITE LYON 1 CNRS VILLEURBANNE FRA ; UNIVERSITE DE LYON UMR5276 LABORATOIRE DE GEOLOGIE DE LYON TERRE PLANETES ENVIRONNEMENT UNIVERSITE LYON 1 ENS LYON CNRS VILLEURBANNE FRA ; UNIVERSITE DE LYON UMR5276 LABORATOIRE DE GEOLOGIE DE LYON TERRE PLANETES ENVIRONNEMENT UNIVERSITE LYON 1 ENS LYON CNRS VILLEURBANNE FRA ; UNIVERSITE DE LYON UMR5276 LABORATOIRE DE GEOLOGIE DE LYON TERRE PLANETES ENVIRONNEMENT UNIVERSITE LYON 1 ENS LYON CNRS VILLEURBANNE FRA ; UNIVERSITE DE LYON UMR5023 ECOLOGIE DES HYDROSYSTEMES NATURELS ET ANTHROPISES UNIVERSITE LYON 1 ENTPE CNRS VILLEURBANNE, FRA
Année
2013
Résumé / Abstract
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, denitrification, 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.
Source
Science of the Total Environment, vol. 450-451, p. 230 - 241

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