Diversité des communautés de microarthropodes dans des sols agricoles (Sud-Ouest de la France) : influence des facteurs environnementaux et bioaccumulation de métaux traces

• Main Authors: Austruy, Annabelle, Gers, Charles, Bur, Thomas, Probst, Anne
• Other Authors: Laboratoire Ecologie Fonctionnelle et Environnement (LEFE), Institut Ecologie et Environnement - CNRS Ecologie et Environnement (INEE-CNRS), Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Observatoire Midi-Pyrénées (OMP), Institut de Recherche pour le Développement (IRD)-Université Toulouse III - Paul Sabatier (UT3), Université de Toulouse (UT)-Université de Toulouse (UT)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Institut de Recherche pour le Développement (IRD)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Météo-France-Centre National de la Recherche Scientifique (CNRS)-Institut National Polytechnique (Toulouse) (Toulouse INP), Université de Toulouse (UT), Institut Ecocitoyen pour la Connaissance des Pollutions Fos-sur-Mer, RMQS, Réseau Mesure et Qualité des Sols
• Format: Article in Journal/Newspaper
• Language: French
• Published: HAL CCSD 2022
• Subjects: Microarthropod; springtail; mite; metal bioaccumulation; bioindicator; agricultural soil; [SDE.BE]Environmental Sciences/Biodiversity and Ecology; [SDE.MCG]Environmental Sciences/Global Changes; [SDE.IE]Environmental Sciences/Environmental Engineering; [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces; environment; [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry; [SDV.EE.ECO]Life Sciences [q-bio]/Ecology; environment/Ecosystems; [SDV.TOX.ECO]Life Sciences [q-bio]/Toxicology/Ecotoxicology; [SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study; Mite; Springtail
• Online Access: https://hal.science/hal-03746467; https://hal.science/hal-03746467/document; https://hal.science/hal-03746467/file/EGS_2022_29_Austruy_309-326.pdf

International audience Cultivated soils are under the influence of mechanical tillage and diffuse metal pollution of anthropogenic origin from atmospheric deposits and agricultural inputs. Communities of microarthropods (springtails and oribatid, gamasid and actinedid mites), living in surface horizons, play an essential role in the soil functioning. This work aims to assess the influence of some agricultural practices, physico-chemical characteristics and metal contamination on the structure and specific richness of microarthropod communities. The main types of agricultural soils, representative of current agricultural activities in the Midi-Pyrénées region, and the associated microarthropods were sampled. Physico-chemical parameters and total concentrations of trace metals (Cr, Ni, Cu, Zn, Cd and Pb) in soils and microarthropods were determined, as well as the fraction of labile metals using sequential extractions and EDTA chemical extraction. The results indicate that land cover influences the diversity and abundance of microarthropods. Indeed, cereal crop soils have a lower abundance and diversity of microarthropods than grassland, vineyard or orchard soils. Moreover, a positive and significant correlation was demonstrated between the total organic carbon and total nitrogen contents of the soil and the abundance of microarthropods. On the contrary, mites and springtails are not impacted by the trace metal concentrations measured in agricultural soils. The ability to bioaccumulate metals in microarthropods is mainly related to trophic levels, with gamasid and actinedid mites (predators) accumulating more than springtails and oribatid mites (detritivores). Finally, the accumulation of metals, partly regulated by their availability in the soil, is also dependent on their affinity and toxicity for microarthopods, in particular for groups of detritivores. Consequently, the communities of microarthropods, and in particular the springtail populations, are of interest, due to their bioaccumulation capacity, for ...