Résumé
This paper presents spatio-temporal variations of angiosperms, bivalves associated with them, to the environmental and conditions of the El Mellah lagoon in 2019 under continental and marine influences. Our results showed significant changes in their distribution, which appear to be linked to fluctuations in the environmental conditions and climatic change, between Zostera noltei and Ruppia maritima, while the seagrass beds are remarkably abundant, with a biomass that can reach 1313.32 ± 132.73 g DW.m -2 during the summer period. we have identified macrofauna made up of five species of bivalves: Cerastoderma glaucum, Abra ovata, Ruditapes decussatus, Loripes orbiculatus, and Arcuatula senhousia. Our results also highlight for the first time, an invasive species A. senhousia, the species dominates the bivalve community. and two threatened edible species in this area, R. decussatus and C. glaucum, probably due to the climat change, the reduced distribution of the Ruppa maritima meadow and silting of the channel.