1. …..EUTROPHICATION

2. When lakes, streams and estuaries are over fertilized, excessive production of aquatic organic matter can become a water quality problem and as a result the eutrophication process can be enhanced!

3. Eutrophication is a natural process! However, humans in their everyday activities can exacerbate the process: Point sources (can locate the cause) Sewage treatment plant discharges Storm sewer discharges Industrial discharges Non-point sources (can’t locate the cause, it’s everywhere) Atmospheric deposition Agricultural runoff (fertilizer, soil erosion) Septic systems

4. Eutrophication: a process by which a body of water progresses from its origin to its extinction. This process happens in stages. BEFORE EUTROPHICATION AFTER EUTROPHICATION

5. LACK OF OXYGEN GROWTH OF BACTERIA DEATH OF PLANTS SUFFOCATION GROWTH OF PLANTS ADDITION OF NITRATES Eutrophication process in 6 stages

6. The process of Eutrophication

7. The process of Eutrophication cont.

8. Biochemical Oxygen Demand (BOD). This measures the rate of oxygen consumption by a sample of water, and therefore gives a good indication of eutrophication. A high BOD means lots of organic material and aerobic microbes, i.e. eutrophication

9. LACK OF OXYGEN GROWTH OF BACTERIA DEATH OF PLANTS SUFFOCATION GROWTH OF PLANTS ADDITION OF NITRATES Eutrophication process in 6 stages

11. Before increases in nutrients:

12. Acceleration of eutrophication :

13. Results of eutrophication :

16. Photo 1: Algal bloom in a lake.

17. Photo 2: Overgrowth of floating aquatic plants.

18. Photo 23: Lake Biwa, the largest lake in Japan during summer time showing overgrowth of aquatic plants.

19. Photo 4: Fish mortality due to lack of oxygen in an Indonesian lake.

20. Put in order the stages of Eutrophication! LACK OF OXYGEN GROWTH OF BACTERIA DEATH OF PLANTS SUFFOCATIONGROWTH OF PLANTS ADDITION OF NITRATES