| Consequences of drought and canicule during the summer of 1976 are related. An analysis allow as to mark out five main districts : Charente, Seudre, North, South and Center of the bassin, each of them with distinctive hydrological and phytoplaktonic characteristics. The rivers Charente and Seudre are particulary eutrophic and any great quantities of nitrates, phosphates and silicates. Eutrophic evaluation of the river Seudre is studied, as well as oyster mortalities that resulted. Reproduction and settlement of spat oysters are related to the hydrology of each distric. |
