red and green algae and seagrass zostera noltii in the shallow waters of the tiligul estuary

seagrass zostera saltwater green algae alga thickets algal flora algobiota algology algosociety black sea bluegreen brown dirty drought dry drying estuary ecosystem europe eutrophication grass macrophytes nature oxidation oxygen water synthesis photosynthesis plant red riparian vegetation ecology seaweed selfpurification shallow singlecelled wildlife