ulva green thicket on coquina stone make air bubble, littoral zone underwater snorkel, oxygen rich clear water surface reflection

cladophora sericea enteromorpha albida ulva intestinalis aquatic bottom coast shallow bryopsis ceramium environment flora grow landscape marine odesa pattern rock salt ocean seascape seaweed submerged sunny travel water wildlife swim exploration space shell gravel torn muddy sand still mussel mollusc vegetation wave surface macrophyte algosociety photosynthesis oxygen synthesis selfpurification eutrophication