green and red algae on underwater rocks (enteromorpha, ulva, ceramium, polisiphonia

alga algae thickets algal flora algobiota algology algosociety animal aquatic black sea bluegreen ceramium cladophora ecological ecology enteromorpha environment europe eutrophication grass green landscape macrophytes marine nature organisms oxidation oxygen water synthesis photosynthesis plant polisiphonia red riparian vegetation saltwater seaweed selfpurification singlecelled ulva undersea underwater footage shot world wild wildlife