coquina stone rockpool, green, red algae, rich biodiversity littoral zone underwater snorkel, oxygen synthesis, low salinity

cladophora albida sericea ulva rigida intestinalis enteromorpha ceramium bryopsis weed aquatic biological bottom coast shallow depth diving ecology environment flora landscape marine nature pattern rock salt ocean seascape seaweed submerged sunny travel odesa wildlife exploration space shell gravel torn muddy sand still mussel mollusc vegetation wave surface macrophyte algosociety photosynthesis selfpurification eutrophication coquina stone rockpool green red algae rich biodiversity littoral zone underwater snorkel oxygen synthesis low salinity black biotope