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. Primary succession- New bare rock comes from 2 sources: 1. volcanic lava flow cools and forms rock

5. Primary succession- New bare rock comes from 2 sources: 2. Glaciers retreat and expose rock

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

7. Primary Succession- Rock

8. Climax community- a stable, mature community that undergoes little or no succession

9. Climax community- Ex: In North Alabama, the climax community would be an Eastern deciduous Forest

10. Eastern Deciduous Forest in U.S.

11. Climax community- Ex: In South Alabama, the climax community would be a Southeastern Mixed Forest.

12. Southeastern Mixed & Outer Coastal Plain Forest

13. Primary succession-

14. 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

15. Secondary succession- Ex: A fire levels portions of a forest

16. Secondary succession- Ex: A farmer plows his field

17. Secondary succession-

19. Pond Succession