green algae on the seabed (ulva, enteromorpha, cladophora

seabed algae brown red green ulva enteromorpha ceramium cladophora porphira underwater landscape black sea thickets algal flora algology algosociety aquatic biological bluegreen ecological ecology environment eutrophication fauna herd macrophytes nature oxygen water synthesis pelagic photosynthesis riparian vegetation saltwater seaweed selfpurification undersea world wild wildlife