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| Loizeau, Veronique; Menesguen, Alain. |
| A five-compartment steady-state food web model is proposed for the benthic food web leading to the dab. Three exposure pathways are considered in the description of accumulation by benthic animals: ingestion of particulate contaminants associated with either sediment or phytoplankton, and respiratory uptake of free dissolved contaminant in overlaying water. Application of the model to a simple food web in the Bay of Seine (Eastern Channel) indicates that : a) feeding is the principal route of contamination, especially for PCB which have more than four chlorine atoms in the molecule ; b) excretion and growth rates, phytoplankton lipid fraction and organic carbon content of sediment are the parameters which mostly determine the chemical bioaccumulation in... |
| Tipo: Text |
Palavras-chave: MODEL; PCB; FOOD WEB; BENTHIC INVERTEBRATES; DAB. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00100/21127/18747.pdf |
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| Raillard, Olivier; Deslous Paoli, Jean-marc; Heral, Maurice; Razet, Daniel. |
| A model simulating growth and feeding is presented for Crassostrea gigas and incorporates such physiological processes as filtration rate, pseudo-faeces production and ingestion, oxygen consumption and spawning. The only state variable is flesh weight. This model is designed to incorporate the effects of quantity and quality of food, temperature and oyster dry weight. Comparison of simulation outputs with real data showed that the model closely simulated the seasonal changes in weight over a two-year sample interval. This simulation confirms that oyster growth in Marennes-Oleron Bay is strongly regulated by the non-organic concentration in the seston. This latter factor dilutes the potential food for oyster and causes a large amount of food rejection in... |
| Tipo: Text |
Palavras-chave: MODEL; ENERGETIC BUDGET; GROWTH; TURBIDITY; CRASSOSTREA-GIGAS. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/1993/publication-3066.pdf |
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| Maze, Guillaume; Forget, Gael; Buckley, Martha; Marshall, John; Cerovecki, Ivana. |
| The Walin water mass framework quantifies the rate at which water is transformed from one temperature class to another by air-sea heat fluxes (transformation). The divergence of the transformation rate yields the rate at which a given temperature range is created or destroyed by air-sea heat fluxes ( formation). Walin's framework provides a precise integral statement at the expense of losing spatial information. In this study the integrand of Walin's expression to yield transformation and formation maps is plotted and used to study the role of air-sea heat fluxes in the cycle of formation-destruction of the 18 degrees +/- 1 degrees C layer in the North Atlantic. Using remotely sensed sea surface temperatures and air-sea heat flux estimates based on both... |
| Tipo: Text |
Palavras-chave: MASS FORMATION; TURBULENT FLUXES; OCEAN SURFACE; MODEL; VARIABILITY; RATES. |
| Ano: 2009 |
URL: http://archimer.ifremer.fr/doc/00115/22647/20373.pdf |
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