Utilisation de gammares encagés comme biomoniteurs pour définir des niveaux de biodisponibilité en éléments métalliques toxiques affectant les densités de gammaridés à l'échelle nationale

Autor: Adeline François, Olivier Geffard, Rémi Recoura-Massaquant, Martial Ferréol, Alexandre Ciliberti, André Chandesris, Arnaud Chaumot, Marina Coquery
Přispěvatelé: Milieux aquatiques, écologie et pollutions (UR MALY), Institut national de recherche en sciences et technologies pour l'environnement et l'agriculture (IRSTEA)
Rok vydání: 2017
Předmět:
0301 basic medicine
Pollution
Environmental Engineering
media_common.quotation_subject
Biological Availability
FRESHWATERS
010501 environmental sciences
Biology
01 natural sciences
03 medical and health sciences
Gammarus
PRIORITY METALS
Biomonitoring
ACTIVE BIOMONITORING
Animals
Amphipoda
14. Life underwater
GAMMARIDS
Waste Management and Disposal
0105 earth and related environmental sciences
Water Science and Technology
Civil and Structural Engineering
media_common
Invertebrate
Ecology
Ecological Modeling
Reproducibility of Results
Ecological assessment
BIOACCUMULATION
biology.organism_classification
6. Clean water
ECOLOGICAL EFFECTS
030104 developmental biology
Water Framework Directive
13. Climate action
Environmental chemistry
Indicator species
Bioaccumulation
[SDE]Environmental Sciences
France
Water Pollutants
Chemical
Environmental Monitoring
Zdroj: Water Research
Water Research, IWA Publishing, 2017, 118, pp.131-140. ⟨10.1016/j.watres.2017.04.031⟩
ISSN: 0043-1354
Popis: International audience; Bioaccumulated concentrations of toxic elements in biomonitor invertebrate species have already been used to successfully link metal bioavailability and impairments of stream macroinvertebrate communities at the scale of the watershed. However, implementing this empirical comparative approach at a greater spatial scale remains a challenge due to the diversity of biogeographical contexts encompassed by regional and national scales.We showed in previous studies that the use of standard organisms caged permits the use of a common biomonitor over a far greater geographical range, while limiting the influence of confounding factors on levels of bioavailable contamination. In this study, levels of Cd, Hg, Ni and Pb contamination assessed by active biomonitoring with caged Gammarus fossarum were compared to abundances of on-site gammarids on 94 sites in France. Based on this national dataset of in situ bioassays, we first re-determined bioavailable background assessment concentrations (BBACs), i.e. concentrations measured in caged G. fossarum indicating a significant bioavailable contamination, which we had previously defined at a regional scale for these four metallic elements. On-site gammarid abundances were retrieved from monitoring programs implemented by French water agencies for the evaluation of ecological status for the European Water Framework Directive. These abundances were corrected for the influence of stream physico-chemical typology in order to permit a reliable comparison of gammarid densities between sites at the national scale. Clear trends of degradation of gammarid densities with increasing levels of bioaccumulated concentrations were identified for three of the four elements (Cd, Ni and Pb). Threshold concentrations in caged organisms above which the numbers of free-ranging gammarids were abnormally low e namely bioavailable ecological assessment concentrations (BEACs) e were determined. The reliability and validity of the BEACs, their comparison with BBACs and their usefulness in terms of prioritisation of contaminants, sites in freshwater management, are discussed.
Databáze: OpenAIRE
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