| Type |
Contract report |
| Date |
1993-03 |
| Language |
English |
| Ref. |
Contract n° AQ2500 - Ifremer 91/1211406/NF |
| Author(s) |
Barille Laurent1, Prou Jean 1 |
| Affiliation(s) |
1 : Ifremer, France |
| Note |
In : Trophic Capacity of an estuarine ecosystem : determination of biological criteria for the management of cultived populations of oysters and their socio economical consequences. |
| Keyword(s) |
Matematical model, Oyster, Crassostrea gigas, Clearance rate, Seclection efficency, Marennes Oleron, Charente Maritime |
| Abstract |
Ecophysiological experiments conducted in situ in the Bay of Marennes-Oléron during a spring and neap tide cycle in May 1991 , were designed to get a better representation of 2 important components of the energy budget of the Japanese oyster Crassostrea gigas : clearance rate and selection efficiency. The relationships previously established by Raillard et al. ( 1993) are re-evaluated by integrating the effects of high seston loads, typical of tidal effect within estuaries, on the physiological processes. For the clearance rate, the re-evaluated parameterization includes: - a negative effect of turbidity. - a clogging threshold set to 192 mg/l. Selection efficiency parameterizations are modified by incorporating : - a constant inorganic ingestion for increasing seston load, set to 17 % of the inorganic filtered ration. - an upper selection threshold for the paticulate organic matter set to 160 mg/l. The oyster growth model should be enhanced by integrating theses new equations built-up on realistic field conditions. |
| Full Text |
| File |
Pages |
Size |
Access |
| 18913.pdf |
12 |
2 MB |
Open access |
|
