1. THE STORY OF A RIVER

2. Most of the rivers begins in the central hills and radiate out, ending up in the ocean.

3. An Upper region of a river

4. Fast flowing of water.

5. Fast flowing. Highly oxygenated

6. Water is pure. Clear.

7. In the upper region ,
it makes water falls.

8. Low bio diversity.
These organisms survive only in unpolluted water.
They are adapted to high speed water.

9. “Trout” fish
- they live in clear,pure water

10. The river flows down to the plains.

11. The river flows down to the plains.

12. In plains, its water flow is reduced.

13. Silt and clay
get collected.

14. Water is less clear.
Bio -diversity is high
High amount of plankton..

15. They are very small organisms.
High in polluted
water.
Planktons

16. These organisms can live in polluted water.
Eg: “Lula”, “Thilapia”, Eel.

17. In coast line,
The water flow is slow.
Sediment and silt load is high

18. Estuaries
Estuaries are places where the rivers fall in to the sea.

19. Estuaries show grater biodiversity than rivers .
Some of the species are fresh water migrants , marine species , and permanent inhabitants adapted to the low salinity.

20. Salmon fish
They can live in both brackish and fresh water.

21. Lagoons

22. Lagoons are;
Brackish water bodies with out permanent connection to the sea.
They are rich in bio- diversity and are good fishery lands.

24. Marshy lands around the estuaries and lagoons.

25. Mangroves

26. Indian ocean