pond or river freshwater zones diagram with text for education. lake ecosystems division into littoral, open water and deep water

aphotic aquatic bottom cartoon deep design diagram different divided division ecosystem ecosystems education environment fish freshwater graphic illustration infographic infographics lacustrine lake landscape layer level limnetic littoral marsh natural nature open outdoors photic plant pond profundal river scenery scheme science shore stock swamp system text tree underwater vector water waterform wetland zonation zone zones