|Address:||UMR 100 Ifremer-UCBN PE2M, "Physiologie et Ecophysiologie des Mollusques Marins", Laboratoire de Biologie et Biotechnologies Marines, IBFA-Université de Caen, Esplanade de la paix, 14032 Caen cedex, Fance|
|Phone:||+33(0)2 31 56 52 95|
Dynamic Energy Budget theory
The model will be build firstly using existing data from literature and then an experimental approach will permit to test and validate the model. This experiment will also serve as a support to estimate a fractionation factor value function of controlled condition (e.g. temperature and food sources). Chosen factors could be manipulated to test the model behaviour and if necessary could be used to calibrate it. Isotope analyses on food sources and on the oyster tissues (whole individual and separate organs) will be made to trace the isotopic food signal from source until their assimilation in individual soft tissues. At the same time a large-scale in situ monitoring of C. gigas populations will be carried out to exploit IsoDEB potentialities as an operational tool for shellfish aquaculture. Biological descriptors (e.g. mass, shell length of oyster but also isotopic composition of specific organs as digestive gland, gonad, muscle) and environmental factors (e.g. temperature, salinity, food concentration) will be monitored at three geographically different sites over two years. The data set obtained in this way will be used for i) reconstructing the trophic history of oysters using the IsoDEB tool in inverse method and ii) for explaining the growth variability observed in C. gigas between culture sites or years. Thus, IsoDEB will provide management information for the shellfish industry via the characterisation of the different oyster-growing areas.