freshwater algae spirogyra release oxygen into the air, oxygen synthesis in water bodies, ukraine

alga algae thickets algal flora algea algobiota algology algosociety aquatic background bloom bubble closeup ecological ecosystem environment eutrophication filamentous foliage freshwater green hydrophytic plant lake layer macrophytes natural nature oxidation oxygen water synthesis photosynthesis pond release sea ecology seaweed spirogyra stagnalis surface swamp texture enrichment plants pollution wildlife zygnematales