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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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| Thebault, Herve; Baena, A; Andral, Bruno; Barisic, D; Albaladejo, J; Bologa, A; Boudjenoun, R; Delfanti, R; Egorov, V; Khoukhi, T; Florou, H; Kniewald, G; Noureddine, A; Patrascu, V; Pham, M; Scarpato, A; Stokozov, N; Topcuoglu, S; Warnau, M. |
| The common mussel Mytilus galloprovincialis was selected as unique biomonitor species to implement a regional monitoring programme, the CIESM Mediterranean Mussel Watch (MMW), in the Mediterranean and Black Seas. As of today, and upon standardization of the methodological approach, the MMW Network has been able to quantify Cs-137 levels in mussels from 60 coastal stations and to produce the first distribution map of this artificial radionuclide at the scale of the entire Mediterranean and Black Seas. While: measured Cs-137 levels were found to be very low (usually <1 Bq kg(-1) wet wt) Cs-137 activity concentrations in the Black Sea and North Aegean Sea were up to two orders of magnitude higher than those in the western Mediterranean Basin. Such effects,... |
| Tipo: Text |
Palavras-chave: Black Sea; Mediterranean; Mussel watch; Monitoring; Radionuclides; Bivalves. |
| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/2008/publication-4477.pdf |
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| Metian, M; Warnau, M; Oberhansli, F; Teyssie, J; Bustamante, Paco. |
| The uptake and loss kinetics of Cd were determined in two species of scallops from the European coasts, the variegated scallop Chlamys varia and the king scallop Pecten maximus, following exposures via seawater, phytoplankton and sediment using highly sensitive radiotracer techniques (Cd-109). Results indicate that, for seawater and dietary pathways, C. varia displays higher bioaccumulation capacities in terms of uptake rate from water and fraction absorbed from ingested food (assimilation efficiency) than Pecten maximus. Regarding sediment exposure, P. maximus displayed low steady-state Cd transfer factor (TFSS < 1); however, once incorporated, a very large part of Cd transferred from sediment (92%) was strongly retained within R maximus tissues.... |
| Tipo: Text |
Palavras-chave: Subcellular distribution; Scallops; Metal; Kinetics; Cadmium; Bivalves. |
| Ano: 2007 |
URL: http://archimer.ifremer.fr/doc/2007/publication-3581.pdf |
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