This is part of the educational series that http://schools.indiawaterportal.org has introduced. This presentation is aimed at allowing the teaching and parent community to explain the existing and potential problems of water mismanagement in our world. This is part of the creative common license

1. Aquatic ecosystems

7. Lake zones Terrestrial plants Littoral zone Emerged plants Floating plants Limnetic zone (open water) Submerged plants Euphotic zone Benthic zone

8. Lake organisms Creatures that go where ever they choose to go Creatures that go where ever the water takes them Creatures that live on the lake bottom fish amphibians Larger zooplanktons Living creatures – planktons Animals: zooplanktons Algae : phytoplankton Bacteria : bacterioplankton Dead creatures –Detritius Internal: produced within lake External: washed in from wash shed Animals Aquatic insects, clams, snails worms, cray fish Plants macrophytes periphyton Bacteria and fungi Sewage sludge

9. The food chain in a lake NUTRIENTS EAT USE RECYCLE EAT EAT PISCIVOROUS FISH PLANKTIVOROUS FISH ZOOPLANKTON ALGAE BENTHIC ORGANISMS

10. Food and energy web in a lake DECOMPOSERS LOSS THROUGH OUTLET LOST TO SEDIMENTS RECYCLED NUTRIENTS TERITIARY CONSUMERS SECONDARY CONSUMERS PRIMARY CONSUMERS PRIMARY PRODUCERS OUTSIDE NUTRIENTS SOLAR ENERGY RECYCLED NUTRIENTS

11. Ocean zones 6,000m 10,000m 2000 to 1,000m 200m 700 to 1,000m 4 degree C 10 degree C