Abstract

The biological reserve of Massa, situated in the National Park of Souss Massa, certified Ramsar has a global interest in birdlife. The functioning of the lagoon is affected by the problems of eutrophication, declining water levels, lack of communication with the sea. This work represents a first contribution to the study of the plankton community living in the lagoon of this reserve in connection with the physical chemistry of water. The analysis of the physico-chemical and biological state shows a very advanced eutrophic water of the lagoon, characterized by high levels of orthophosphate and chlorophyll a. The structure of zooplankton populations is characterized by the dominance of species of eutrophic environments and tolerates changes in salinity.

Key words: Reserve of Massa, eutrophication, zooplankton, lagoon, physico-chemical.