Consulta: creatorFacets:"Ayrault, Sophie"
Registros recuperados: 3
Data/hora: 06/06/2024 00:56:14

Bioavailability of particulate metal to zebra mussels: Biodynamic modelling shows that assimilation efficiencies are site-specific
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Bourgeault, Adeline; Gourlay-france, Catherine; Priadi, Cindy; Ayrault, Sophie; Tusseau-vuillemin, Marie-helene.
This study investigates the ability of the biodynamic model to predict the trophic bioaccumulation of cadmium (Cd), chromium (Cr), copper (Cu), nickel (Ni) and zinc (Zn) in a freshwater bivalve. Zebra mussels were transplanted to three sites along the Seine River (France) and collected monthly for 11 months. Measurements of the metal body burdens in mussels were compared with the predictions from the biodynamic model. The exchangeable fraction of metal particles did not account for the bioavailability of particulate metals, since it did not capture the differences between sites. The assimilation efficiency (AE) parameter is necessary to take into account biotic factors influencing particulate metal bioavailability. The biodynamic model, applied with AEs...
Tipo: Text
Palavras-chave: Bioaccumulation; Active biomonitoring; Bioavailability of particulate metals; Assimilation efficiency; Chemical sequential extraction.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00051/16218/14040.pdf

Spatio-temporal variability of solid, total dissolved and labile metal: passive vs. discrete sampling evaluation in river metal monitoring
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Priadi, Cindy; Bourgeault, Adeline; Ayrault, Sophie; Gourlay-france, Catherine; Tusseau-vuillemin, Marie-helene; Bonte, Philippe; Mouchel, Jean-marie.
In order to obtain representative dissolved and solid samples from the aquatic environment, a spectrum of sampling methods are available, each one with different advantages and drawbacks. This article evaluates the use of discrete sampling and time-integrated sampling in illustrating medium-term spatial and temporal variation. Discrete concentration index (CI) calculated as the ratio between dissolved and solid metal concentrations in grab samples are compared with time-integrated concentration index (CI) calculated from suspended particulate matter (SPM) collected in sediment traps and labile metals measured by the diffusive gel in thin films (DGT) method, collected once a month during one year at the Seine River, upstream and downstream of the Greater...
Tipo: Text
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00036/14678/12111.pdf

Quantifying diet-borne metal uptake in Gammarus pulex using stable isotope tracers
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Pellet, Bastien; Ayrault, Sophie; Tusseau-vuillemin, Marie-helene; Gourlay-france, Catherine.
Gammarids are aquatic amphipods widely used for water quality monitoring. To investigate the copper and cadmium diet-borne metal uptake in Gammarus pulex, we adapted the pulse-chase stable isotopes-based approach to determine the food ingestion rate (IR), the gut retention time (GRT) and the metal assimilation efficiencies (AE). G. pulex were fed with 65Cu-, 106Cd-, and 53Cr-labeled alder leaves for 7.5 h and then with unlabeled leaves for 5 d. The metal stable isotope contents in the gammarids, leaves, filtered water and periodically collected feces were determined. Chromium was poorly assimilated by the gammarids; thus, Cr was used as an unassimilated tracer. The first tracer defecation occurred before the first feces harvest, indicating a gut passage...
Tipo: Text
Palavras-chave: Assimilation efficiency; Gammarus pulex; Cadmium; Copper; Biodynamic model; Diet-borne uptake.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00211/32238/31762.pdf