| Extensive data have been obtained on oyster-bearing sediments and interstitial and overlying waters in the Bassin des Chasses, les Sables d'Olonne, which will enable a scale of suitability of waters for oyster-culture to be compiled. The studies concerned: I. Hydrology, including fresh water inflow: II. Salinity; alkaline reserve; Na, K, Ca and Mg levels: III. Circulation and distribution of nitrogenous substances: IV. The N sub(2) cycle: V.P. Nitrogenous and phosphorus nutrients are regenerated continuously in the sediments and replenish the free water. |
