1. Succession in Ecosystems

2. Succession
a series of changes in a community in which new populations of organisms gradually replace existing ones

3. Primary Succession
colonization of new sites by communities of organisms
takes place on bare rock

4. New bare rock comes from 2 sources:
Primary Succession
New bare rock comes from 2 sources:
1. volcanic lava flow cools and forms rock
2. Glaciers retreat and expose rock

5. Pioneer Species the first organisms to colonize a new site
Ex: lichens are the first to colonize lava rocks

6. Primary Succession

7. a stable, mature community that undergoes little or no succession
Climax Community
a stable, mature community that undergoes little or no succession

8. Climax Community
Ex: In most of Virginia, the climax community would be a deciduous oak–hickory forest
                                                                                                                                

9. Primary Succession
Rock

10. takes place on existing soil
Secondary Succession
sequence of community changes that takes place when a community is disrupted by natural disaster or human actions
takes place on existing soil

11. Secondary Succession
Ex:
A fire levels portions of a forest

12. Secondary Succession
Ex:
A farmer plows his field

13. Secondary Succession

14. Secondary Succession

15. Pond Succession

16. Pond Succession