red and green algae under the ice. shore of the frozen tiligul estuary

frozen tiligul estuary ukraine ice alga algae thickets algal bloom flora algobiota algology algosociety animals wild aquatic organism cladophora ecological ecology enteromorpha europe eutrophication grass green living macrophytes marine oxidation oxygen water synthesis photosynthesis plant porphira salad saltwater sea life seaweed selfpurification ulva ulvaceae undersea underwater world pollution wildlife