green algae ulva thicket grow on coquina stone, water surface reflection, rich biodiversity littoral zone underwater

ulva rigida vegetation cladophora albida intestinalis aquatic biological black sea bottom coast shallow depth diving ecology environment flora grow landscape marine nature pattern rock salt ocean seascape seaweed submerged sunny travel water wildlife swim exploration space shell gravel torn muddy sand still mussel mollusc wave surface macrophyte algosociety photosynthesis oxygen synthesis selfpurification eutrophication