green cladophora vegetation, coquina stone rockpool, rich biodiversity littoral zone underwater, oxygen rich low salinity

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