1. TOPIC: Ecology AIM: What is ecological succession?

2. Why do ecosystems change?
living things change ecosystems to make them more suitable -But by doing this they make it less suitable for themselves and more suitable for other organisms.
Why do
ecosystems
change?

3. Ecological
Succession
When an existing community is slowly replaced by another until a stable one exists

4. Pioneer Organism 1st organisms Start succession
Bacteria, fungi, lichens
Pioneer
Organism

5. Stable, mature community
Forest
Climax
Community

6. Remains until catastrophic event (fire, flood, volcanic eruption…) 
Successions starts again

8. What are some other examples of primary and secondary succession?

9. Stages of Succession in a Pond

10. Succession in lakes or ponds
Fig Diagram of bog succession. Open water (a) is transformed through formation of a floating mat of sedge and deposition of sediments (b) into wetland forest (c).
© 2003 John Wiley and Sons Publishers