bryopsis, ulva, cladophora green algae in laminar flow, low salinity black sea biotope aquascape, coquina stone littoral zone

cladophora sericea enteromorpha albida ulva intestinalis aquatic bottom coast shallow ceramium underwater landscape environment flora grow thicket marine odesa rock salt saltwater ocean seascape seaweed submerged summertime travel wildlife swim exploration space shell gravel sand turquoise mussel mollusc vegetation air bubble wave macrophyte algosociety photosynthesis oxygen synthesis selfpurification eutrophication ecology ukraine