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| 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 |
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| Lebrun, Jeremie D.; Uher, Emmanuelle; Tusseau-vuillemin, Marie-helene; Gourlay-france, Catherine. |
| Biomonitoring, assumed to be an integrative measurement of the chemical exposure of aquatic organisms, is not straightforward for essential metals because they can be actively regulated by animals. Although increasing bioaccumulation with exposure levels is a crucial endpoint for the development of biomonitors, it is rarely verified in real environments, where the metal concentrations are rather low and vary little. This study was designed at the scale of a river basin to assess the ability of Gammarus pulex indigenous populations to accumulate Cu, Zn and Mn in realistic exposure conditions. During two annual campaigns, water and gammarids were collected at various sites contrasted in terms of physicochemistry and contamination. The results show... |
| Tipo: Text |
Palavras-chave: Biomonitor; Metal bioavailability; Gammarus pulex; Copper; Zinc; Manganese. |
| Ano: 2014 |
URL: http://archimer.ifremer.fr/doc/00180/29154/28656.pdf |
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