1. Succession...

2. Mount St. Helen’s Video Part 1

3. What is Succession?

4. Succession
An orderly change in communities of organisms that occurs over time
Primary Succession- begins with bare rock after geologic activity (ex: volcano)
Secondary Succession- begins on soil from which previous community has been removed (fire, agriculture...)

5. Primary Succession

6. Secondary Succession

7. Think about here...
An area of the field outside is left to grow, how would it change over time?

8. Field Succession
Grass Shrubs Trees Forest

9. Primary or Secondary?

10. Primary or Secondary?

11. Primary or Secondary?

12. Primary or Secondary?

13. Pioneer Species- the first to arrive

14. Climax Community- the final goal

15. How Does an Ecosystem “Start Over”?

16. Clear Cutting- People can speed up succession after by planting trees

17. Lava Flow- New rock over top.

18. Fire- cleans out an area

19. Forest Fires (and Wildfires)
Video

20. Palmetto vs Scrub Oak

21. Some Disturbance is Devastating

22. How about a water system?
Take the picture and try and place them in order from beginning of succession to climax community in order.
Good Luck!

24. Pioneer Stage Bare muddy or sandy bottom Algae is primary producer
Caddisfly Larva and fish that nest or burrow in bottom

26. Submergent Plant Stage
Organisms decay forming soil on bottom
Small aquatic plants grow but do not reach surface
Dragonfly and Mayfly larva as well as weedy bottom fish

28. Emergent Plant Stage Continues to fill with decaying matter
Larger plants grow through surface
Cattails, bullrushes, water lilies
Frogs, turtles, salamanders, a few fish
Bacteria consume O2, less available to fish

30. Marsh No large open areas of water Vegetation covers most of the land
No truly aquatic fish can survive

32. Swamp Marsh has become more dry, filled with more soil
Trees start to grow like swamp maple and swamp willow

34. Forest Swamp has filled in with soil and dried up
Trees like maple and beech dominate

35. Mount St. Helen’s Regrowth Video Part 5