brown algae macrophytes cystoseira barbata and other green and red algae at the bottom of the tiligul estuary

red algae barbata brown tiligul estuary black sea cystoseira alga thickets algal flora algology algosociety aquatic plant ceramium chlorophyta cladophora coastline ecological ecology enteromorpha environment eutrophication grass green macrophytes marine nature oxidation oxygen water synthesis photosynthesis plumosa polisiphonia saltwater seaweed selfpurification ulva undersea underwater world wild wildlife