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| Bustamante, Paco; Teissier, J.l; Warnau, M. |
| Laboratory radiotracer experiments were performed to study the uptake, assimilation and retention of americium (241Am) and cesium (134Cs) by the common cuttlefish Sepia officinalis. Uptake and loss kinetics of the radionuclides were measured following exposure through sediments, seawater and food at different stages of the animal's life cycle. Sediment was found to be a minor uptake pathway for both radionuclides in juveniles. Following a short seawater exposure, cuttlefish accumulated 241Am and 134Cs, but only to a limited extent (whole-body CF < 2). Among the cuttlefish organs, branchial hearts and their appendages displayed the highest degree of uptake for 241Am (CF = 42 and 16, respectively), but these tissues contained low percentage of total 241Am... |
| Tipo: Text |
Palavras-chave: Retention; Radionuclides; Cephalopods; Biokinetics; Accumulation. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1872.pdf |
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| Bustamante, Paco; Teyssie, J; Fowler, S; Warnau, M. |
| Radionuclide experiments were performed to study the accumulation, retention and transport of Am-241 and Cs-134 in egos of the common cuttlefish Sepia officinalis. Experiments were designed to determine the processes controlling uptake of both radionuclides following, exposure via seawater. The bioaccumulation of both radionuclides displayed saturation kinetics with steady state in uptake being reached in 10 d for Am-241 and 6 d for (CS)-C-134. Am-241 was readily taken up by the eggs which reached a concentration factor (CF) of 20 after 10 d of exposure. During embryonic development. the eggshell acted as an effective shield against Am-241 penetration with 98% of the radionuclide associated with this membrane. In contrast. (CS)-C-134 was transported across... |
| Tipo: Text |
Palavras-chave: Cephalopods; Bioaccumulation; Biokinetics; Radionuclides. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1871.pdf |
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| Lacoue Labarthe, T; Warnau, A; Oberhansli, F; Teyssie, J; Koueta, Noussithe; Bustamante, Paco. |
| Cuttlefish eggs were exposed to background concentrations of dissolved Ag and Cd, using the radiotracers Ag-110m and Cd-109. At different time of the embryonic development (50 days), some eggs were placed in non-contaminating conditions. During the experiment, the uptake and depuration kinetics, and distribution of these metals among the egg compartments (i.e. eggshell, vitellus, peri-vitelline fluid and embryo) were assessed. In parallel, experiments were conducted with sub-lethal concentrations of stable Ag and Cd (2 and 1 mu g l(-1), respectively) to compare the metal behaviour at higher concentrations. From the spawning date up to I month of development, both metals were taken up efficiently by the eggs, reaching load/concentration ratio (LCR) of 1059... |
| Tipo: Text |
Palavras-chave: Cephalopod; Permeability; Eggshell; Embryo; Biokinetics; Silver; Cadmium. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-3882.pdf |
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| Metian, Marc; Hedouin, Laetitia; Eltayeb, Mohamed M.; Lacoue-labarthe, Thomas; Teyssie, Jean-louis; Mugnier, Chantal; Bustamante, Paco; Warnau, Michel. |
| The present work aimed at better understanding metal and metalloid bioaccumulation in the edible Pacific blue shrimp Litopenaeus stylirostris, using both laboratory and field approaches. In the laboratory, the bioaccumulation kinetics of Ag, Cd, Co, Cr, and Zn have been investigated in shrimp exposed via seawater and food, using the corresponding gamma-emitting radiotracers (Ag-110m, Cd-109, Co-57, Cr-51, and Zn-65) and highly sensitive nuclear detection techniques. Results showed that hepatopancreas and intestine concentrated the metals to the highest extent among the blue shrimp organs and tissues. Moulting was found to play a non negligible detoxification role for Co, Cr and, to a lesser extent, Zn. Metal retention by L stylirostris widely varied (from... |
| Tipo: Text |
Palavras-chave: Crustacean; Metals; Biokinetics; Radiotracers; Moulting; Contamination. |
| Ano: 2010 |
URL: http://archimer.ifremer.fr/doc/00014/12528/9869.pdf |
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