alga
algae thickets
algal flora
algobiota
algosociety
aquatic
black sea
cladophora
ecological
ecology
environment
european flora
eutrophication
flora
grass
macrophytes
marine
nature
oxygen in water
oxygen synthesis
photosynthesis
plant
riparian vegetation
salt lake
saltwater
sea ecology
seaside
seaweed
selfpurification of water
ulva
water world
wildlife
wooden footbridge