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 of organisms, takes place on bare rock
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 are called pioneer species
Lava rocks are typically colonized first by lichens

7. Primary Succession
Rock

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

9. Climax community:
In Ohio, the climax community would be a mix of deciduous trees, of various combinations (such as an Oak–hickory forest

10. Primary succession

11. 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

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

13. Secondary succession
Ex:
A farmer plows a
field

14. Secondary succession

15. Secondary succession

16. Pond Succession
If left alone, depending upon multiple factors, succession will lead a lake/pond into a wetland, a meadow (field) and eventually a forest.